Poly Butylene Succinate Research Articles

Fully bio-based ternary polymer blends: structural characterization and mechanical behavior

In this work, ternary immiscible blends based on poly (lactic acid) (PLA) as major phase and polybutylene succinate (PBS) and poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHH) as minor phases were prepared through melt blending, aiming at obtaining fully biobased materials with enhanced ductility and toughness as compared to the inherently brittle matrix. Thermodynamic considerations based on the calculation of the interfacial tensions predicted the achievement of a partial encapsulation between the domains of the two minor components embedded in the PLA matrix. The rheological characterization revealed higher melt viscosity and elasticity for all the ternary blends as compared to the PLA matrix and a growing level of interfacial interactions between the different phases when increasing amounts of PBS are incorporated. This last was confirmed through morphological observations, which allowed demonstrating the achievement of an improved homogeneous microstructure for the blends containing 30 and 40 wt% of PBS, notwithstanding the relatively good interfacial adhesion obtained in all the explored materials. The combined effect of the strong established interfacial interactions and of the uniform morphology resulted in the obtainment of dramatic increments of ductility, tensile toughness and impact strength for all formulated ternary blends as compared to the PLA matrix, and especially for those containing 30 or 40 wt% of PBS, while maintaining satisfactory levels of stiffness and tensile strength.

Mechanism and kinetics of enzymatic degradation of polyester microparticles using a shrinking particle-shrinking core model.

Generalized shrinking particle (SPM) and shrinking core (SCM) models were developed to the kinetics of heterogenous enzymatic degradation of polymer microparticles in a continuous microflow system. This enzymatic degradation was performed in a microfluidic device designed to both physically separate and immobilize the microparticles. Then time-resolved measurements were made using image processing of the physical changes of the particles during degradation. The kinetics of enzyme-polymer intermediate formation, enzymatic bond cleavage, and enzyme diffusion through the layer of degraded substrate (SCM only) were mathematically derived to predict the time-resolved degradation of the substrate. The proposed models were tested against the degradation of 15-25 μm particles of polycaprolactone (PCL) and poly (butylene adipate-co-terephthalate) (PBAT) by cutinase enzyme from Humicola insolens. Degradation of PCL microparticles followed the SPM model and its kinetics were found to be zero-order, while the SCM model applied to PBAT microparticles showed first-order kinetics. Further, the degradation of polybutylene succinate (PBS), and poly butylene-sebacate-co-terephthalate (PBSeT) microparticles demonstrated wide applicability of the method. The use of image processing simplifies the required analysis by eliminating the need to remove aliquots or concentrate effluent for additional analytical characterization.

Recent insight into the biomedical applications of polybutylene succinate and polybutylene succinate-based materials

Recent insight into the biomedical applications of polybutylene succinate and polybutylene succinate-based materials

Improved Bone Regeneration Using Biodegradable Polybutylene Succinate Artificial Scaffold in a Rabbit Model.

The treatment of extensive bone loss represents a great challenge for orthopaedic and reconstructive surgery. Most of the time, those treatments consist of multiple-stage surgeries over a prolonged period, pose significant infectious risks and carry the possibility of rejection. In this study, we investigated if the use of a polybutylene succinate (PBS) micro-fibrillar scaffold may improve bone regeneration in these procedures. In an in vivo rabbit model, the healing of two calvarial bone defects was studied. One defect was left to heal spontaneously while the other was treated with a PBS scaffold. Computed tomography (CT) scans, histological and immunohistochemical analyses were performed at 4, 12 and 24 weeks. CT examination showed a significantly larger area of mineralised tissue in the treated defect. Histological examination confirmed a greater presence of active osteoblasts and mineralised tissue in the scaffold-treated defect, with no evidence of inflammatory infiltrates around it. Immunohistochemical analysis was positive for CD56 at the transition point between healthy bone and the fracture zone. This study demonstrates that the use of a PBS microfibrillar scaffold in critical bone defects on a rabbit model is a potentially effective technique to improve bone regeneration.

Physicochemical properties of lignin nanoparticles from softwood and their potential application in sustainable pre-harvest bagging as transparent UV-shielding films

Technical lignin can be mainly obtained as a waste by-product from pulp industry, and it exhibits unique properties including ultraviolet adsorption, biodegradable, antibacterial, and antioxidant which can be utilized for bioplastic applications. However, common limitations of technical lignin for plastic applications are compatibility mainly due to poor interfacial adhesion, relatively large particle size and impurity. In this study lignin nanoparticles from softwood (S-LNPs) were successfully produced through a continuous-green-scalable antisolvent precipitation and the suitability of S-LNPs for fabrication of bio-composite polybutylene succinate (PBS) films using conventional blown film extrusion was examined. The attained S-LNPs showed lower ash content, higher phenolic content and higher lignin content compared to pristine softwood kraft lignin (S-lignin). Rheological property including shear viscosity and melt-flow index was determined. The obtained PBS/S-LNP composite films showed improved tensile modulus, higher water vapor transmission rate and excellent UV-shielding ability compared to neat PBS and PBS/S-lignin films. Accelerated weathering testing was conducted to replicate outdoor conditions. Degradation indices including carbonyl, vinyl and hydroxyl of the weathered PBS/lignin composites were evaluated for photo-oxidative stability. The S-LNPs as multifunctional bio-additives in biodegradable composite film exhibited superior performances of transparency, UV-absorption and stiffness with high photo-oxidative stability suitable for outdoor applications.

Study on modified poplar wood powder/polylactic acid high toughness green 3D printing composites

In order to alleviate environmental pollution and the shortage of petroleum resources, improve the utilization of renewable materials, the research of biodegradable green composite materials has become a research hotspot. In this paper, Poplar Wood powder(PWP) and Polylactic acid(PLA) were selected, adding poly lactic acid graft maleic anhydride (MPLA) and Silane coupling agent KH-550 (KH550) as a compatibilizer and coupling agent to improve interface compatibility, at the same time, poly Butylenedioate-co-terephthalate (PBAT) and poly Butylene Succinate (PBS) were added to improve the toughness of the composites. The experimental results show that, the impact strength of 20 %-KMPP/PBAT/PBS composite modified by MPLA and KH550 was 20.70 kJ/m−2. Secondly, the hydrophobic angle of the composite material is as high as 112°. It is found that the high content of PWP with small particle size (200 mesh) can make it more evenly dispersed in the composite material, and the cross section of the composite material was smooth. The modified composite was 4.24$/kg, which reduced the cost by 28.07 %. The research results have opened up a new way to develop 3D printed biomass composites with low cost, high compatibility, high toughness and good environmental adaptability, and broadened the application scope and value of the composites.

Investigation of the adsorption-desorption behavior of antibiotics by polybutylene succinate and polypropylene aged in different water conditions.

Microplastics (MPs) are widely present in aqueous environments and aged by natural components of complex water environments, such as salinity (SI) and dissolved organic matter (DOM). However, the effects of multicondition aging on the physicochemical properties and environmental behavior of MPs have not been completely investigated. In this study, the degradable MP polybutylene succinate (PBS) was used to investigate the environmental behavior of sulfamethoxazole (SMZ) and was compared with polypropylene (PP). The results showed that the single-factor conditions of DOM and SI, particularly DOM, promoted the aging process of MPs more significantly, especially for PBS. The degrees of MP aging under multiple conditions were lower than those under single-factor conditions. Compared with PP, PBS had greater specific surface area, crystallinity, and hydrophilicity and thus a stronger SMZ adsorption capacity. The adsorption behavior of MPs fitted well with the pseudo-second-order kinetic and Freundlich isotherm models, indicating multilayer adsorption. Compared with PP, PBS showed relatively a higher adsorption capacity, for example, for MPs aged under DOM conditions, the adsorption of SMZ by PBS was up to 5.74mg/g, whereas that for PP was only 3.41mg/g. The desorption experiments showed that the desorption amount of SMZ on MPs in the simulated intestinal fluid was greater than that in Milli-Q water. In addition, both the original PBS and the aged PBS had stronger desorption capacities than that of PP. The desorption quantity of PBS was 1.23-1.84 times greater than PP, whereas the desorption rates were not significantly different. This experiment provides a theoretical basis for assessing the ecological risks of degradable MPs in complex water conditions.

Polybutylene succinate/modified cellulose bionanocomposites as sorbent for needle trap microextraction

In this work, different polybutylene succinate/modified cellulose bio-nanocomposites were synthesized by solving the casting method and then used as a new sorbent for needle trap microextraction of some polycyclic aromatic hydrocarbons from the water samples in headspace mode. The surface of cellulose nanocrystalline was modified using aminosilane groups to improve the dispersion of nanoparticles in the polybutylene succinate matrix. The characterization of synthesized nanocomposites, were performed using TGA, SEM, BET analysis and FT-IR spectroscopy. Adding modified nanocrystalline cellulose to a polybutylene succinate matrix increased the surface area, and thermal and mechanical stabilities. The significant parameters of the sorbent extraction process, including the amount of modified cellulose nanoparticles, the extraction time, and temperatures and salt content, were studied and optimized. Under the optimized extraction conditions (extraction time of 25 min, and extraction temperature of 50 °C), an analytical method for selected polycyclic aromatic hydrocarbons with low detection limits (0.75–1 ng L−1) and the quantification limit (3–5 ng L−1), good repeatability (3–7% at 20 ng L−1), and reproducibility (9%–14%, n = 3) was developed. The linearity of the method was obtained in the range of 5–1000 ng L−1 with R2 > 0.9996. The enrichment factor was obtained for the spiked real aqueous samples (at 50 ng L−1) in the range of 276–311. Also, the performance of the developed method was studied via the extraction of selected analytes in real water samples, and the relative recovery values were found to be in the range of 98–103%.

Ylang-ylang (Cananga odorata) essential oils with flora odorants enhanced active function of biodegradable polyester films produced by extrusion

Ylang-ylang (Cananga odorata) essential oils (EO) has several active components with flora odorants which are compatible with several foods and desserts. Incorporation of Ylang-ylang EO into biodegradable polymers potentially produce functional packaging, releasing desirable aroma which is attractive to consumers. This research aimed to enhance active function of biodegradable polyester blend films namely polybutylene adipate-co-terephthalate (PBAT) and polybutylene succinate (PBS) using cast extrusion with Ylang-ylang EO. Characterizations of the film include morphology, relaxation, infrared absorption and packaging properties. Adding EO gave a smoother microstructure and surface topography and modified the crystal lattice of the PBS phase. Infrared absorption indicated EO-polymer interaction involving C–H stretching vibration. Polymer relaxation influenced transport of gas molecules through PBAT/PBS/EO matrices. Decreased α-relaxation temperature suggested plasticization effects of the amorphous PBAT phase by EO, increasing oxygen and water vapor permeability by 2.52 and 1.16 times, respectively. Polymer relaxation and crystallinity influenced transport of non-polar oxygen through PBAT/PBS/EO matrices. Moreover, films containing EO effectively delayed fungal growth in pandan pudding and layered pudding by more than 3 days due to the release of volatiles that exhibited antifungal activities. Findings suggested potential of Ylang-ylang EO incorporated biodegradable films to produce active packaging for aroma release, extending product shelf-life.

Polyesters Incorporating Gallic Acid as Oxygen Scavenger in Biodegradable Packaging.

Biodegradable polyesters polybutylene succinate (PBS) and polybutylene adipate-co-terephthalate (PBAT) were blended with gallic acid (GA) via cast extrusion to produce oxygen scavenging polymers. The effects of polyesters and GA contents (5 to 15%) on polymer/package properties were investigated. Increasing GA formed non-homogeneous microstructures and surface roughness due to immiscibility. GA had favorable interaction with PBAT than PBS, giving more homogeneous microstructures, reduced mechanical relaxation temperature, and modified X-ray diffraction and crystalline morphology of PBAT polymers. Non-homogenous dispersion of GA reduced mechanical properties and increased water vapor and oxygen permeability by two and seven folds, respectively. Increasing amounts of GA and higher humidity enhanced oxygen absorption capacity, which also depended on the dispersion characteristics of GA in the matrices. PBAT gave higher oxygen absorption than PBS due to better dispersion and higher reactive surface area. GA blended with PBAT and PBS increased oxygen scavenging activity as sustainable active food packaging using functional biodegradable polymers.

Structural characteristics and sound absorption properties of different kinds of waste feather fibers

There are millions of tonnes of waste feathers every year from the booming poultry industry. To rationalize the utilization of waste feather resources, waste chicken feather fibers, waste duck feather fibers, and waste goose feather fibers were used as reinforcement materials, and polybutylene succinate was used as matrix materials to prepare sound absorbing composite materials. The acoustic impedance transfer function method was used to test the sound absorption performance of the sound absorbing composite materials with different feather fibers. The results showed that the sound absorbing composite materials with waste duck fibers had the best sound absorption performance. Fourier transform infrared spectrometer, X-ray diffraction, and scanning electron microscope were used to analyze the macromolecular structure, aggregation structure, and morphological structure of different kinds of waste feather fibers. According to the structure, the mechanism of sound absorption was analyzed, and the reason why the fibers of different kinds of waste feathers (chicken feather, duck feather and goose feather) had good sound absorption performance was clarified. It was clear that this unique structure endowed it with the characteristics of light weight and good sound absorption. So the waste feather fibers have high application value in the field of sound absorption.

Antimicrobial and Gas Barrier Crustaceans and Fungal Chitin-Based Coatings on Biodegradable Bioplastic Films

Chitin nanofibrils (CN) can be obtained from crustaceans and fungal sources and can be used for preparing coatings for bioplastic films, that are fundamental for developing a safe and sustainable biodegradable food packaging. Coatings with different concentrations of CN from shrimps were applied on different bioplastic substrates, like Poly (butylene succinate-co-adipate)/Poly(3-hydroxybutyrate-co-3-hydroxyvalerate (PBSA/PHBV) blend, Polybutylene succinate (PBS), and Polybutylene adipate terephthalate/Poly(lactic acid) (PBAT/PLA) blend, but the adhesion to the substrates was scarce. On the contrary, the fungal-based CN showed a better adhesion. Additionally, it was found that the use of an additive based on oligomeric lactic acid was useful to prepare a coating with an improved adhesion to bioplastics. The gas barrier properties to oxygen and water vapour of coated and un-coated films were measured, revealing an improvement of these properties thanks to applied coatings, especially towards the oxygen. Antimicrobial properties and biodegradation capacity were also evaluated revealing an antibacterial effect of the coatings that did not significantly interfere with their biodegradability. The results are discussed and interpreted considering the correlation between composition and macromolecular structures with the observed functional properties.

Fabrication of a Polybutylene Succinate (PBS)/Polybutylene Adipate-Co-Terephthalate (PBAT)-Based Hybrid System Reinforced with Lignin and Zinc Nanoparticles for Potential Biomedical Applications.

Polybutylene adipate-co-terephthalate (PBAT) was used in an effort to improve the properties of polybutylene succinate (PBS). The resultant blend consisting of PBS/PBAT (70/30) was reinforced with lignin at different loadings (5 to 15 wt.%) and zinc (ZnO) nanoparticles (1.5 wt.%). Hot melt extrusion and injection moulding were used to prepare the hybrid composites. The mechanical, thermal, physical, self-cleaning, and antimicrobial properties of the resultant hybrid composites were investigated. The transmission electron microscopy (TEM) results confirmed that ZnO was successfully prepared with average diameters of 80 nm. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) confirmed that there were interactions between the fillers and the blend. The tensile strength and elongation at the break of the resultant materials decreased with increasing the loadings, while the tensile modulus showed the opposite trend. The melting behaviour of the blend was practically unaffected by incorporating lignin and ZnO nanoparticles. In addition, the incorporation of fillers reduced the thermal stability of the materials. Furthermore, the incorporation of ZnO nanoparticles introduced photocatalytic properties into the polymer blend, rendering it to be a functional self-cleaning material and enhancing its antimicrobial activities.

A Facile Strategy for Compatibilization of PLA/PBS Blends by Incorporating Camellia Seed Powder

AbstractUsing biodegradable blending materials is one of the most effective ways to address plastic pollution but it is hindered by its poor interfacial interaction along with high costs. Herein, an envirionmentally friendly filler, camellia seed powder (CSP)−a byproduct of camellia seed after defatting, is reported, which is first served as a compatibilizer in polylactic acid (PLA)/polybutylene succinate (PBS) blends without any other aids or complicated pretreatment, effectively toughening the PLA/PBS blends due to a better interfacial interaction. The results show that the toughness of composites increases with CSP content. With the addition of 30 phr CSP, its impact strength and elongation at break increase by 44.31% and 148.42%, respectively, as compared with the blend without CSP. The combined effects of improved interfacial bonding, reduced particle size of PBS and efficient stress transfer are responsible for the toughness enhancement. The compatibilization mechanism is proposed that ─COOH groups in PLA and PBS react with ─NH2in CSP. The above finding of CSP as a compatibilizer provides a facile and inexpensive strategy in the fabrication of high‐performance biodegradable materials.

Barrier and Seal Properties of Reactive Blending of Poly(butylene succinate) Based Blends

Poly Butylene Succinate (PBS) is one of the biodegradable polymers with good physical properties but its barrier properties such as the oxygen barrier are poor. The aim of this study was to investigate the barrier and seal properties of PBS by blending with biodegradable poly hydroxybutyrate-co-hydroxyvalerate (PHBV). PBS and PHBV (80/20 and 70/30 %w/w) with and without reactive agents were prepared using an internal mixer. Film specimens of 100 micrometers in thickness were prepared using compression molding. The morphology, barrier properties and peel-seal strength were investigated. Morphological observations using scanning electron microscope (SEM) showed an improved dispersion of PHBV in the blends after adding the reactive agents. The oxygen barrier and water vapor barrier were determined using ASTM D3985 and ASTM E96, respectively. The results showed that the addition of PHBV into the blend films led to lower OTR and WVTR when compared to the neat PBS. The addition of reactive agents can further improve the OTR and WVTR of PBS/PHBV blends due to the compact and dense structure of the films. Peel–seal behavior of the films was examined by the different sealing temperatures, which determined the failure mechanism after peeling. The blend films with reactive agents after sealing temperature between 105 and 115°C were peeled from the substrate with adhesive and cohesive failures showing the easy peel mode.

Biodegradable Poly(Butylene Succinate) Nanocomposites Based on Dimeric Surfactant Organomodified Clays with Enhanced Water Vapor Barrier and Mechanical Properties.

Biocomposites based on biodegradable polybutylene succinate (PBS) and organomodified clays (OMt) were prepared by melt blending process. The OMt nanofillers were obtained by ion exchange reaction between sodium montmorillonite (Mt) and gemini surfactants bearing 4-decyloxyphenylacetamide hydrophobic chains and ethylene or hexylene spacer. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and rheological measurement results showed that the investigated hybrids present a uniform dispersion with an exfoliation of clay into the PBS matrix, particularly for short spacer surfactant based composites. The effect of organoclay loading and composition on the thermal, mechanical, and barrier properties was also investigated. High clay loading and long gemini surfactant spacer lead to substantial improvement of Young modulus values by 21%, while low clay content induces a reduction of the hybrid's crystallinity due to strong OMt-PBS interactions. Compared to that of the neat PBS film, a significant reduction of the water vapor permeability (WVP) by 28% was obtained by adding only 3 wt % of PBS/OMt (2) which opens up prospects for this material in the field of food packaging. This study shows that gemini surfactant-modified organoclays can be used as effective nanofillers in a PBS matrix to access to value-added nanocomposites.

CO2 laser perforated biodegradable films for modified atmosphere packaging of baby corn

Microperforated polylactic acid (PLA) and polybutylene succinate (PBS) films were fabricated using a CO2 laser under various pulse fluences from 37.0 to 369.8 J/cm2, corresponding to pulse durations of 20–200 μs. A hole was formed at perforation thresholds of 147.9 J/cm2 for PLA and 129.4 J/cm2 for PBS films. The area and diameter of the microhole and volume losses increased with rising laser fluence. Microperforated PLA and PBS films showed similar mechanical properties of tensile strength, Young's modulus and elongation at break to films without microholes but significant improvements in oxygen transmission rate (OTR) and carbon dioxide transmission rate (CO2TR) over non-perforated films. OTR and CO2TR through a single microhole with area of ∼20,000 μm2 on PLA were 234 ± 58 and 217 ± 57 cm3/d, respectively while OTR and CO2TR though a single microhole on PBS were 205 ± 12 and 144 ± 40 cm3/d, respectively showing that biodegradable film could achieve very high OTR at up to 77,500 cm3/m2.d. Baby corn (100g) was packed in microperforated bags. Equilibrium modified atmosphere conditions of 10%–17%O2 and 4%–7% CO2 were reached in performed film packages with very high OTR and CO2TR of 35,000–77,500 and 36,500–80,000 cm3/m2.d, respectively. Results suggested that baby corn maintained freshness qualities for more than 7 days at a storage temperature of 15 °C. The CO2 laser perforation process was successful in producing modified atmosphere packaging (MAP) with tailored gas transmission rates.

Biodegradable and hydrophobic nanofibrous membranes produced by solution blow spinning for efficient oil/water separation

The development of nanofibrous oil-water separation materials is explosively progressing, but the remarkably low productivity is the main factor hindering their practical application. In this study, biodegradable polybutylene succinate (PBS) nanofibers with excellent productivity (27.0 g/h per nozzle) were successfully fabricated using the solution blow spinning (SBS) process, breaking away from the conventional electrospinning method. The prepared PBS nanofibers exhibited extremely thin fiber diameters (130 nm) with high porosity (97.4%). Without any chemical modification or inorganic/organic hybrid materialization, the PBS nanofibrous membrane showed excellent oil adsorption capacity (minimum: 18.7 g/g and maximum: 38.5 g/g) and separation efficiency; water and oil mixtures (99.4–99.98%) and emulsions (98.1–99.5%) compared to conventional organic polymer-based nanofibers. In terms of disposal after use, this biodegradable nanofibrous membrane was able to return to nature through hydrolysis and biodegradation processes.

Combination effect of zinc borate in intumescent polybutylene succinate systems: Study of the carbonaceous structures using solid-state NMR

Inspired by the concept of intumescence, this research proposed and exemplified a strategy for reinforcing the carbonaceous structures to improve the fire retardancy of intumescent polybutylene succinate (PBS). Herein, intumescent PBS formulations were fabricated by incorporating ethylenediamine phosphate (EDAP) and melamine (MEL) or melamine cyanurate (MCA) as well as zinc borate (ZnB) into PBS at a relatively low loading (10 wt%). The reaction to fire of PBS formulations were assessed by mass loss calorimeter (MLC) and the reinforcement mechanism of the condensed phase was investigated by solid-state NMR technique. Compared to PBS/EDAP&MEL(5:1,10%) and PBS/EDAP&MCA(5:1,10%), the synergistic combination of ZnB and EDAP&MEL (or EDAP&MCA) significantly reduced the peak of heat release rate (pHRR) of PBS/EDAP&MEL(5:1,8%)/ZnB(2%) and PBS/EDAP&MCA (5:1,8%)/ZnB(2%) by 61% and 53%, respectively, exhibiting high degrees of intumescence. Meanwhile, the fire growth rate index (FIGRA) were reduced by 48.8% and 39.5%, respectively, and the maximum average rate of heat emission (MARHE) decreased by 47.9% and 53.3%, respectively. Moreover, the flameout time increased by 428 s (from 507 to 935 s) and 444 s (from 509 to 954 s), respectively. Those phenomena suggested a synergistic flame retardant effect of ZnB and intumescent additives on PBS. Solid-state NMR of 11B, 13C and 31P of the top and bottom of chars after MLC test demonstrated the strengthening of the protective char by the formation of borophosphate and other phosphate glasses, limiting cracking and increasing the char cohesion.

Deciphering the Fingerprint of Dissolved Organic Matter in the Soil Amended with Biodegradable and Conventional Microplastics Based on Optical and Molecular Signatures.

Biodegradable polymers are promoted as promising alternatives for conventional non-degradable plastics, but they may also negatively impact soil ecosystems. Here, we estimated the effects of biodegradable (polylactide (PLA) and polybutylene succinate (PBS)) and non-biodegradable (polyethylene (PE) and polystyrene (PS)) microplastics at a concentration of 1% (w/w) on dissolved organic matter (DOM) in two soil types, a black soil (BS) and a yellow soil (YS), by using fluorescence excitation-emission matrix spectroscopy and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). PBS significantly increased the contents of soil dissolved organic carbon (DOC) and the relative intensities of protein-like components. The turnover rates of soil DOM were statistically higher in PBS treatments (0.106 and 0.196, p < 0.001) than those in other microplastic groups. The FT-ICR-MS results indicated that more labile-active DOM molecules were preferentially obtained in biodegradable microplastic treatments, which may be attributed to the polymer degradation. The conventional microplastics showed no significant effects on the optical characteristics but changed the molecular compositions of the soil DOM. More labile DOM molecules were observed in BS samples treated with PE compared to the control, while the conventional microplastics decreased the DOM lability in YS soil. The distinct priming effects of plastic-leached DOM may trigger the DOM changes in different soils. This study provided important information for further understanding the impact of microplastics on soil carbon processes.