Miscibility Properties Research Articles

The study on the engine pressure variation of utilizing n-butanol-gasoline blends at fueling spark ignition engines

Abstract Alternative fuel solutions are highly regarded as potential solutions to more emissions regulation as well as more efficient energetic consumption requirements. The more efficient combustion engines become, the lesser resources they require to propel vehicles thus resulting in lower carbon footprint and lower pollutants such as CO, HC and NOx. Alcohols are promising alternative fuels that can be used to fuel vehicles, on their own or in blends with conventional fuels such as gasoline and diesel. A lot of studies have been done on alcohols such as ethanol, butanol and methanol. Each of the mentioned solutions have their advantages and disadvantages. Butanol looks a promising solution due to its high miscibility properties making it possible to blend in higher percentages with other fuels such as gasoline for example. Compared to ethanol, butanol is also less corrosive, making it ideal for older vehicles as well without any modifications to the fuel systems. Many studies have shown that the high oxygen content of butanol can help improve the combustion process in spark ignition engines, may improve thermal efficiency resulting in lower emissions and better overall engine stability. An improved engine stability can be measured by a lower variability between engine cycles during engine functioning. The objective of this paper is to determine the impact of fueling a spark ignition engine with a blend of 15% vol. n-butanol – 85% vol. gasoline on pressure variability and combustion. No engine adjustments/optimizations are done at fueling with the blended fuel vs pure gasoline. The baseline was set at an engine speed of 2500 min-1 and load of 55% while fueling with pure gasoline. After setting the baseline, the same measurements are done at fueling with the blended fuel.

Zinc oxide as a new catalyst for poly(lactic acid)/maleated polypropylene reactive blending: an approach to enhance miscibility and mechanical properties

Zinc oxide as a new catalyst for poly(lactic acid)/maleated polypropylene reactive blending: an approach to enhance miscibility and mechanical properties

Development of an Extraction Column using Machine Learning for the Prediction of Feed and Solvent to Obtain the Desired Extraction

The phrase "Industry 4.0" describes the fourth industrial revolution, which is characterized by the usage of digital technology to improve automation, connectivity, and efficiency across various industrial processes. The optimal column designs, suitable solvent selection, and extraction yield prediction are all aided by artificial intelligence (AI). Integration of AI technology with extraction columns is a significant step forward for industrial processes, bringing in a new era of intelligent systems that drive previously unheard-of increases in quality, efficiency, and environmental responsibility. The choice of acetone and water as the input solvents and Methyl Isobutyl Ketone (MIBK) as the extracting solvent results in an ideal configuration for the machine-learning design of an extraction column. With acetone's enhanced solubility and miscibility properties and water's versatility as a solvent, the two work well together. The extraction column was created using Python and concepts and methods based on chemical properties as well as machine learning. The intended extraction column may be implemented with the help of the Python code that is supplied. Based on parameters entered by the user, including extract temperature, raffinate temperature, extract mass flow rate, and extract temperature, it forecasts the temperatures and mass flow rates of acetone and water. By considering the properties of mass flow rates and temperatures, the projections ensure physical feasibility. Utilizing controlled data for training, the model applies a linear regression approach. The findings include the mass flow rate of acetone, the temperature of the water, and the water mass flow rate. The integration of state-of-the-art machine-learning techniques and Industry 4.0 is made possible in this work. This holds the promise of increased process optimization and efficiency in chemical extraction processes.

Molecularly Mixed Composite Membranes for Gas Separation Based on Macrocycles Embedded in a Polyimide.

Polyimides are a polymer class that has been extensively investigated as a membrane material for gas separation owing to its interesting permselective properties in a wide range of operation temperatures and pressures. In order to improve their properties, the addition of different filler types is currently studied. p-tert-Butylcalix[n]arene macrocycles (PTBCs) with different cavity sizes (PTBC4, PTBC6, PTBC8) were used as fillers in a commercial thermoplastic polyimide, with a concentration in the range 1-9 wt%, to develop nanocomposite membranes for gas separation. The selected macrocycles are attractive organic compounds owing to their porous structure and affinity with organic polymers. The nanocomposite membranes were prepared in the form of films in which the polymeric matrix is a continuous phase incorporating the dispersed additives. The preparation was carried out according to a pre-mixing approach in a mutual solvent, and the solution casting was followed by a controlled solvent evaporation. The films were characterized by investigating their miscibility, morphology, thermal and spectral properties. The gas transport through these films was examined as a function of the temperature and also time. The results evidenced that the incorporation of the chosen nanoporous fillers can be exploited to enhance molecular transport, offering additional pathways and promoting rearrangements of the polymeric chains.

Effective removal of personal care product residues from aqueous media using hydrophobic deep eutectic solvents: Experimental and computational approach

Personal care product (PCP) residues - classified under micropollutants (MPs)- are widely found in aquatic environments, posing trace-level toxicity. Traditional water treatment techniques struggle to remove these toxins effectively. Deep eutectic solvents (DESs), the liquid mixtures typically composed of hydrogen bond donors (HBDs) and hydrogen bond acceptors (HBAs), have recently emerged as a viable alternative for extracting pollutants from water. Among DESs, hydrophobic deep eutectic solvents (HDESs) exhibit low water miscibility and unique solvent properties. The main objective of this study is to synthesize HDESs to effectively eliminate 2-naphthol and methylparaben- two of the significant chemical contaminants in PCPs- from aqueous media. HDESs were prepared by mixing different terpenes (menthol and thymol) and long-chain carboxylic acids at varying molar ratios. They were characterized using different spectroscopic and thermal techniques. The density and viscosity of the pure DESs were measured as afunction of temperature. Experimental studies were carried out using the liquid–liquid extraction (LLE) method, and the factors influencing the efficiency of extraction were optimized.Considering the limited number of studies on the extraction mechanism of MPs from aqueous media, this study employs comprehensive computational methods, including density functional theory (DFT) and the COnductor-like Screening MOdel for Real Solvents (COSMO-RS), to provide a detailed interpretation of the extraction mechanism. A series of successive extractions were conducted to reduce the DES usage to ensure economic viability. The reusability of the best-performed DES was explored. Additionally, the regeneration of one of the DESs was accomplished through activated carbon-based recovery.---------------------------------------------------------------------------------------------------------------------

Poly(ethylene succinate-co-lactic acid) as a Multifunctional Additive for Modulating the Miscibility, Crystallization, and Mechanical Properties of Poly(lactic acid).

Polymer blending offers an effective and economical approach to overcome the performance limitations of poly(lactic acid) (PLA). In this study, a series of copolymers poly(ethylene succinate-co-lactic acid) (PESL) were synthesized, featuring lactic acid (LA) contents that ranged from 20 to 86 wt %. This synthesis involved a one-pot industrial melt polycondensation process using succinic acid (SA), ethylene glycol (EG), and LA, catalyzed by titanium tetraisopropoxide (TTP). The goal was to produce a fully biobased copolymer expected to exhibit partial miscibility with pure poly(lactic acid) (PLA). To assess the capability of PESL copolymers in toughening PLA, we conducted tensile testing on PLA/PESL blends containing 15 wt % PESL. As a result, an elongation at break for the blends with 15 wt % loading of the copolymer PESL72 was directly enhanced to 250% with an ultimate strength of 35 MPa, compared to brittle PLA with less 10% tensile length. The morphological features of interfacial adhesion before and after tensile failure were measured by scanning electron microscopy (SEM). A significant enhancement in the chain mobility of the PLA/PESL blends was further evidenced by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). These findings hold promise for the development of functional packaging materials based on PLA. The proposed copolymer design, which boasts strong industrial feasibility, can serve as a valuable guide for enhancing the toughness of PLA.

Computational investigation of the interaction mechanisms of low‐density polyethylene (LDPE)/polyurethane and low‐density polyethylene (LDPE)/hexane systems as absorbents for oil spill remediation: A DFT study

AbstractThe escalating frequency of oil spill incidents and industrial wastewater discharges necessitates the development of effective remediation strategies. In this study, we conduct a comprehensive computational investigation using density functional theory (DFT) to elucidate the interaction mechanisms within polyethylene (PE) combined with polyurethane (PU) and hexane. The study focuses on adsorption energies, intermolecular interactions, miscibility, and electronic properties, providing a molecular‐level understanding crucial for designing advanced absorbent materials. The investigation reveals that the low‐density polyethylene/polyurethane (LDPE/PU) system exhibits significantly higher adsorption energies (−12.87 kcal/mol) compared to PE/hexane (−7.66 kcal/mol), indicating a robust binding affinity. This discrepancy underscores the superior performance of PE/PU as an absorbent material. The enthalpy results, with ∆H values of −55.75 kcal/mol for PE/hexane‐n‐hexadecane and −66.11 kcal/mol for PE/PU‐n‐hexadecane complexes at 298.15 K, support exothermic adsorption. The more exothermic ∆H for PE/PU indicates stronger interactions during oil absorption than PE/hexane. Additionally, Gibbs free energy change (∆G) values affirm a more favorable process for PE/PU, exhibiting a lower ∆G (−42.54 kcal/mol) compared to PE/hexane (−34.79 kcal/mol). Non‐covalent interaction (NCI) studies confirm the importance of van der Waals forces in both systems, validating their role in the adsorption process. Miscibility studies indicate limited interactions, with PE/PU showing positive enthalpy of mixing. Electronic study demonstrates PE/PU's higher energy gap of 9.19 eV, correlating with superior performance. This research contributes to the fundamental understanding of oil absorption processes and informs the design and optimization of environmentally sustainable and efficient oil‐absorbing materials for remediation applications.Highlights DFT explores polymeric systems, PE/PU and PE/hexane, for oil absorbent. PE/PU excels with −12.87 kcal/mol adsorption energy, surpassing PE/hexane (−7.66 kcal/mol). NCI validates van der Waals forces in both systems, crucial for effective adsorption. Miscibility studies reveal limited interactions. PE/PU's superior 9.19 eV energy gap signifies enhanced absorbent performance. PE/PU excels as an oil‐absorbent material, underlining its overall superiority.

Fabrication of Oleophilic Polypeptide Nanoparticle from Complexing of Cross-Linked Epsilon-poly-l-lysine with Docusate Sodium for Preparation of Bactericidal Thermoplastic Polyurethanes.

Thermoplastic polyurethanes (TPUs) are extensively utilized in the biomedical field due to their exceptional mechanical properties and biocompatibility. However, the lack of antibacterial activity limits their application ranges. Nanoscopic particle-based additives with inherent antibacterial characteristics are regarded as promising strategies to prevent biomaterials-associated infection. Herein, a novel polymeric nanoparticle is prepared, which integrates chemically cross-linked epsilon-poly-l-lysine (CPL) and anionic surfactant-docusate sodium (DS). The cross-linked epsilon-poly-l-lysine/docusate sodium (CPL/DS) nanoparticle can be well dispersed in organic solvent and a polymer matrix, which is beneficial to endowing TPUs with synergistic miscibility and antibacterial properties. An antibacterial test showed that the CPL/DS nanoparticles have strong antibacterial activity against S. aureus. Moreover, the results of antibacterial experiments in vitro revealed that almost 100% of S. aureus could be killed by CPL/DS nanoparticle-embedded TPU film with a content of 0.5 wt %. In addition, all of the CPL/DS modified TPU films showed good cytocompatibility in vitro. Consequently, this kind of CPL/DS nanoplatform has great potential to serve as a safe and high-efficient bactericidal agent for endowing biomedical devices with bactericidal property.

Development of Eco-Friendly Biocomposite Films Based on Opuntia ficus-indica Cladodes Powder Blended with Gum Arabic and Xanthan Envisaging Food Packaging Applications.

Currently, food packaging is facing a critical transition period and a major challenge: it must preserve the food products' quality and, at the same time, it must meet the current requirements of the circular economy and the fundamental principles of packaging materials eco-design. Our research presents the development of eco-friendly packaging films based on Opuntia ficus-indica cladodes (OFIC) as renewable resources. OFIC powder (OFICP)-agar, OFICP-agar-gum arabic (GA), and OFICP-agar-xanthan (XG) blend films were eco-friendlily prepared by a solution casting method. The films' properties were investigated by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (X-RD), and differential scanning calorimeter (DSC). Water solubility and moisture content were also determined. Morphology, thickness, molecular interactions, miscibility, crystallinity, and thermal properties, were affected by adjusting the gums (GA and XG) content and glycerol in the blend films. Moisture content increased with increasing glycerol and XG content, and when 1.5 g of GA was added. Water solubility decreased when glycerol was added at 50% and increased with increasing GA and XG content. FTIR and XRD confirmed strong intermolecular interactions between the different blend film compounds, which were reflected in the shifting, appearance, and disappearance of FTIR bands and XRD peaks, indicating excellent miscibility. DSC results revealed a glass transition temperature (Tg) below room temperature for all prepared blend films, indicating that they are flexible and soft at room temperature. The results corroborated that the addition of glycerol at 30% and the GA to the OFICP increased the stability of the film, making it ideal for different food packaging applications.

PPG-PEG-PPG/Epoxy systems cured at 100 °C: relationship between miscibility, microstructure, thermal and mechanical properties

This article evaluated the thermal, mechanical, morphological and fracture properties of systems with poly (ethylene glycol)–poly(propylene glycol)–poly(ethylene glycol) (PPG-PEG-PPG) triblock copolymer, with molecular weight 2000 g•mol−1 and 50% PEG in its composition, in DGEBA/DDM epoxy matrix. Systems with 10, 20 and 30 wt.% copolymer were prepared by in-situ polymerization and curing at 100 °C. In the differential scanning calorimetry (DSC) analysis, the characteristic temperatures of both the copolymer and the matrix in the binary systems were verified, indicating that phase separation had occurred. However, the glass transition temperature referring to the epoxy phase (Tg-E) occurred at lower temperatures than in neat matrix, which indicates partial miscibility in binary systems. The epoxy/copolymer systems presented a Young's modulus higher than the neat matrix, and without loss of mechanical resistance, reinforcing the miscibility of the PEG block in the blends and a microstructure with nanophase separation. When evaluating the fracture surface of the blends by scanning electron microscopy, the presence of deflection and crack immobilization mechanisms was observed, but no phase separation of the copolymer was observed. In this way, the systems studied showed partial miscibility with the formation of nanophases at the curing temperature of 100 °C, influencing Tg-E and improving the stiffness of the matrix.

A flash signal amplification approach for ultrasensitive and rapid detection of single nucleotide polymorphisms in tuberculosis

In recent years, the demand for rapid, sensitive, and simple methods for diagnosing deoxyribonucleic acid (DNA) has grown due to the increase in the variation of infectious diseases. This work aimed to develop a flash signal amplification method coupled with electrochemical detection for polymerase chain reaction (PCR)-free tuberculosis (TB) molecular diagnosis. We exploited the slightly miscible properties of butanol and water to instantly concentrate a capture probe DNA, a single-stranded mismatch DNA, and gold nanoparticles (AuNPs) to a small volume to reduce the diffusion and reaction time in the solution. In addition, the electrochemical signal was enhanced once two strands of DNA were hybridized and bound to the surface of the gold nanoparticle at an ultra-high density. To eliminate non-specific adsorption and identify mismatched DNA, the self-assembled monolayers (SAMs) and Muts proteins were sequentially modified on the working electrode. This sensitive and specific approach can detect as low as attomolar levels of DNA targets (18 aM) and is successfully applied to detecting tuberculosis-associated single nucleotide polymorphisms (SNPs) in synovial fluid. More importantly, as this biosensing strategy can amplify the signal in only a few seconds, it possesses a great potential for point-of-care and molecular diagnosis applications.

A study on miscibility properties of polyacrylonitrile blending films with biodegradable polymer, shellac

A study on miscibility properties of polyacrylonitrile blending films with biodegradable polymer, shellac

Mechanical properties and structure of injection molded poly(hydroxybutyrate‐co‐hydroxyvalerate)/poly(butylene adipate‐co‐terephthalate) (PHBV/PBAT) blends

AbstractBlending poly(hydroxybutyrate‐co‐hydroxyvalerate) (PHBV) and poly(butylene adipate‐co‐ terephthalate) (PBAT) presents an effective approach to fabricate fully biodegradable polymer blends with tailored mechanical properties. This study investigated the composition on the mechanical properties and structure of PHBV/PBAT blend. The remarkable enhancement in elongation of the PHBV/PBAT blends was shown due to the ductile PBAT. The fracture behavior of the PHBV/PBAT specimens transited from brittle to ductile with the increase of the PBAT in the blends. Two different phases as a co‐continuous microstructure with a large interpenetrating structure indicate immiscibility between PHBV and PBAT in the PHBV/PBAT (50:50) specimen. The miscibility, intermolecular interaction, and mechanical properties of PHBV/PBAT blends were also investigated by molecular dynamics simulation. The results showed the immiscibility of PHBV and PBAT. The degradation temperature increased from 277 to 356°C with the increase of PBAT content in the PHBV/PBAT blend. Whereas the crystallinity ability of the PHBV component in the blend was confined by the PBAT phase, leading to a decrease in the overall crystallinity of PHBV.

Interaction between synthetic elastin-like polypeptide and collagen: Investigation of miscibility and physicochemical properties

Poly(GVGVP), where G-Glycine, V-Valine, and P-Proline, is a synthetic elastin-like polypentapeptide that has been studied for its interaction with collagen in blends using viscometry, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and X-ray diffractogram (XRD) techniques. Additionally, the thermal characteristics such as glass transition temperature (Tg) and thermal stability of the blends were studied respectively by Differential Scanning Calorimetry (DSC) and Thermogravimetric analysis (TGA). The results showed that amide A and B band's positions in FTIR spectra of collagen were shifted correspondingly to higher and lower wavenumbers after blending with polypentapeptide. DSC study unveiled characteristic glass transition temperatures (Tg) for the blends and the particular components. All the blends show thermal stability in between the pure polymers. Viscosity evaluations also showed a strong association between collagen and poly(GVGVP). Collagen and poly(GVGVP) together may provide the opportunity to assemble novel, promising materials for biomedical purposes.

Small-Scale EOR Pilot in the Eastern Eagle Ford Boosts Production

Summary Low primary and secondary recoveries of original oil in place from modern unconventional reservoirs beg for utilization of tertiary recovery techniques. Enhanced oil recovery (EOR) via cyclic gas injection (“huff ‘n’ puff”) has indeed enhanced the oil recovery in many fields, and many of those projects have also been documented in industry technical papers/case studies. However, the need remains to document new techniques in new reservoirs. This paper documents a small-scale EOR pilot project in the eastern Eagle Ford and shows promising well results. In preparation for the pilot, full characterization of the oil and injection gas was done along with laboratory testing to identify the miscibility properties of the two fluids. Once the injection well facility design was completed, a series of progressively larger gas volumes were injected followed by correspondingly longer production times. Fluids in the returning liquid and gas streams were monitored for compositional changes, and the learnings from each cycle led to adjustments and facility changes to improve the next cycle. After completing five injection/withdrawal cycles in the pilot, a few key observations can be made. The implementation of cyclic gas injection can be both a technical and a commercial success early in its life if reasonable cost controls are implemented and the scope is kept manageable. The process has proved to be both repeatable and predictable, allowing for future economic modeling to be used to help determine timing of subsequent injection cycles. A key component of the success of this pilot has been the availability of small compressors capable of the high pressures required for these projects and learning how to implement cost saving facility designs that still meet high safety standards.

Optical and Thermal Investigations of Eutectic Metallomesogen Mixtures Based on Salicylaldiaminates Metal Complexes with a Large Nematic Stability Range

The mesomorphic behavior and the miscibility properties of binary mixtures of a new series of Schiff base metallomesogen (MOM) are evaluated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Nuclear magnetic resonance (NMR), elemental analysis (CHNX), Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to certify the molecular structure of the compounds. The results revealed that the studied mixtures are completely miscible throughout the composition field and exhibit a nematic phase which covered the whole composition range. In the mixtures, the stability of the nematic phase varies continuously, and it is possible to highlight the presence of a eutectic composition with a wide mesogenic stability range.

Miscibility, thermal degradation and rheological analysis of epoxy/MABS blends.

The effect of the addition of the methyl methacrylate acrylonitrile butadiene styrene (MABS) copolymer on the miscibility, thermal degradation and rheological properties of epoxy systems is described. Epoxy resin/MABS blends containing 5, 10, 15 and 20 phr MABS were prepared using the solution mixing technique. Homogenous blends obtained using this technique have undergone a polymerization reaction induced phase separation process by the introduction of the curing agent 4,4'-diaminodiphenyl sulfone (DDS). The isothermal rheology at four different temperatures, 150, 160, 170 and 180 °C, was used to examine the effect of MABS on the gelation and vitrification time. The evolution of storage modulus, loss modulus and tan delta was found to be closely related to the evolution of complex phase separation. The increase in the complex viscosity during curing was determined by in situ rheometry and theoretically analysed by fitting with the Williams-Landell-Ferry equation. An exponential increase in complex viscosity was observed, which was induced by cross-linking. The variation of Tg before and after curing was studied using DSC analysis and dynamic kinetic modeling of the curing process was carried out by utilizing dynamic DSC scans. Thermal stability studies of completely cured epoxy/MABS blends using thermogravimetric analysis revealed that all the blends and neat epoxy exhibited single step degradation. Thermal degradation kinetics was calculated using the Coats Redfern equation.

The Biomimetic System of Oleanolic Acid and Oleic Acid at the Air-Water Interface-Interactions in Terms of Nanotechnology-Based Drug Delivery Systems.

Oleanolic acid (OLA) and oleic acid (OA) are ubiquitous in the plant kingdom, exhibiting a therapeutic effect on human health, and are components of novel pharmaceutical formulations. Since OLA has limited solubility, the utilization of nanotechnology-based drug delivery systems enhancing bioavailability is highly advantageous. We report on the interfacial behavior of the OLA:OA system at various molar ratios, using the Langmuir technique to assess the dependence of the molar composition on miscibility and rheological properties affecting film stability. Specifically, we evaluate the interfacial properties (morphology, thermodynamics, miscibility, and viscoelasticity) of the OLA:OA binary system in various molar ratios, and indicate how the OLA:OA system exhibits the most favorable molecular interactions. We apply the Langmuir monolayer technique along with the complementary techniques of Brewster angle microscopy, dilatational interfacial rheology, and excess free energy calculations. Results demonstrate that the properties of mixed monolayers depend on OLA:OA molar ratio. Most of the systems (OLA:OA 2:1, 1:1, 1:5) are assumed to be immiscible at surface pressures >10 mN/m. Moreover, the OLA:OA 1:2 is immiscible over the entire surface pressure range. However, the existence of miscibility between molecules of OLA and OA in the 5:1 for every surface pressure tested suggests that OA molecules incorporate into the OLA lattice structure, improving the stability of the mixed film. The results are discussed in terms of providing physicochemical insights into the behavior of the OLA:OA systems at the interface, which is of high interest in pharmaceutical design.

Poly (ethylene oxide) (PEO) influence on mechanical, thermal, and degradation properties ofPLA/PBSeTblends

AbstractPoly (lactic acid) (PLA) is an important biodegradable plastic with unique properties. However, its widespread application is hindered by its low miscibility and suboptimal degradation properties. To overcome these limitations, we investigated the mechanical, thermal, and degradation properties of PLA and poly (butylene sebacate‐co‐terephthalate) (PBSeT) blends in the presence of poly (ethylene oxide) (PEO). Specifically, this study aimed to identify the effects of PEO as a compatibilizer and hydrolysis accelerator in PLA/PBSeT blends. PLA (80%) and PBSeT (20%) were melt blended with various PEO contents (2–10 phr), and their mechanical, thermal, and hydrolytic properties were analyzed. All PEO‐treated blends exhibited a higher elongation at break than that of the control sample, and the tensile strength was slightly reduced. In the PEO 10% sample, the elongation at break increased to 800% of that of the control sample. Differential scanning chromatography (DSC) analysis confirmed that when PEO was added to the PLA/PBSeT blends, the two glass transition temperatures (Tg) narrowed, resulting in improved miscibility of PLA and PBSeT. In addition, the hydrolytic degradation of the PLA/PBSeT/PEO blend accelerated as the PEO content increased. It was confirmed that PEO can act as a compatibilizer and hydrolysis‐accelerating agent for PLA/PBSeT blends.

Impact of fluorination of central thiophene linking core in thermostable perylene-diimide-based dimeric acceptors on molecular configuration and photovoltaic performance

Fluorination was an easy and effective strategy to adjust the absorption, electronic energy level, molecular configuration and aggregation as well as charge mobility, miscibility, morphology and photovoltaic property. Herein, two perylene-diimide-based non-fullerene dimeric acceptors, called T-(PDI-HD)2 and 2FT-(PDI-HD)2, were obtained via Stille coupling reaction between bistin compounds (TSn and 2FTSn) and monobromide PDI-HDBr. The dramatically reduced twisted angle from 81.80o to 19.78o and strengthened molecular stacking both in chlorobenzene solution and solid film states were found after fluorination, resulting in an elevated thermostability and slightly enhanced electron mobility. Furthermore, fluorination led to the down-shifted ELUMO, worse miscibility and undesired microstructural morphology with oversized aggregation which impeded the exciton dissociation and restricted the photocurrent. As a consequence, the slightly declined VOC, 18.52% down-shifted JSC but 12.38% increased FF were found, leading to a 9.69% decline in PCE from 2.58% to 2.33% after bisfluorinating the central thiophene linking core, which was imputed to the deepened ELUMO, worse light-harvesting capability and undesired morphology as a result of fluorination regardless of the slightly elevated electron mobility. Our results have demonstrated that it was cautious that incorporating fluorine substituents into central linking core by virtue of tuning the twisting degree boosted the photovoltaic property in PDI-based dimeric acceptors.