Toughness Of Resin Research Articles

Toughened Bamboo-Fiber-Modified Epoxy Resin: A Novel Polymer Coating for Superior Interfacial Compatibility

Epoxy resin is regarded as a reliable option for coating advanced materials owing to its outstanding strength, adhesion, and stability. However, its relatively weak toughness compared to common materials has limited its application. In this study, the toughness of epoxy resin was enhanced by incorporating bamboo fibers, and a novel polymer coating material for bamboo-fiber-reinforced epoxy resin was developed. Different fiber pretreatment methods were employed to address the issue of poor interfacial performance between bamboo fibers and epoxy resin, aiming to optimize its performance as an advanced material coating. The effects of curing agents, fiber mesh sizes, fiber contents, and fiber pretreatment methods on the mechanical properties of the fiber-modified resin composites were investigated. The findings indicate that the JH45 and T31 curing agents were more effective in promoting the homogeneous dispersion of fibers within the epoxy resin. Additionally, bamboo fibers modified with KH550 exhibited enhanced interfacial properties: the tensile strength of the composite demonstrated a respective increase of 31.1% and 27.0% compared to untreated fibers. Increasing the mesh size proved advantageous for improving tensile properties, albeit potentially impacting the compressive properties. Particularly noteworthy was the significantly enhanced interfacial compatibility between bamboo fibers treated with the silane coupling agent KH550 and the epoxy resin. Analysis using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) revealed that treating bamboo fibers with sodium hydroxide effectively enhanced bonding at the fiber–resin interface. This enhancement was attributed to the combined effects of bamboo fiber hydrolysis and delamination reactions. The silane coupling agent promoted the chemical reaction between bamboo fibers and epoxy resin through grafting, thereby strengthening the cross-linking property of the composites. These findings offer valuable insights into the design and fabrication of natural-fiber-reinforced polymer composites suitable for coating advanced materials.

Preparation of modified epoxy resin with high hydrophobicity, low dielectric constant, toughness, and flame retardant by epoxy-functionalized siloxanes

A series of α, ω-dimethylglycidoxypropyl-terminated PDMS oligomer (PDMS-GE) oligomers with different polymerization degrees were synthesized and used to modify the bisphenol-A diglycidyl ether E51 (DGEBA) / 4,4-diaminodiphenylmethane (DDM) epoxy resin, resulting in epoxy resins with high hydrophobicity, low dielectric constant, good impact toughness, low combustion heat release rate, and low total heat release. The combustion heat release rate and total heat release of the material decreased with the increase in the loadings of PDMS-GE. Relative to pure epoxy resin, the composite E51/D30–10, which using DGEBA as the matrix, PDMS-GE with a degree of polymerization of 30 as the modifier in an amount of 10 phr relative to the mass sum of DGEBA, PDMS-GE and DDM, exhibited the best comprehensive performance with a water contact angle of 102.42°, a dielectric strength of 6.49 kV/mm, a dielectric constant of 2.93 at 14.2 GHz, the peak rate of heat release (PRHR) and total heat release (THR) are of 378.3 kW/m2 and 134.4 MJ/m2, respectively. These comprehensive performances underscore the potential of PDMS-GE oligomers in significantly improving epoxy resin properties. When the loadings of PDMS-GE oligomers are less than 5 wt%, PDMS-GE with a lower degree of polymerization can improve the toughness of epoxy resins. The impact strength of the composite E51/D24–5, which uses DGEBA as the matrix, PDMS-GE with a degree of polymerization of 24 as the modifier in an amount of 5 phr relative to the mass sum of DGEBA, PDMS-GE, and DDM, reaches 98.1 kJ/m2, which is about 28.9 % higher than that of pure epoxy resin. The results also indicated that the degree of polymerization of PDMS-GE oligomers has less influence on the dielectric properties and mechanical properties of composite materials.

Torsional Performance of Vat-Photopolymerized Tough Resin: Influence of Gauge Length and UV Post-Curing

Abstract Background A myriad of materials, ranging from soft sensors to bone substitutes, undergo torsional loading throughout their operational lifespan. Many of these materials are produced using additive manufacturing (AM) technology due to its broad applicability. Understanding the torsional behavior of these AM components is crucial prior to their utilization. However, research on the torsional behavior of solid additively-manufactured resin polymers remains very limited. Objective To address the gap in understanding the torsional behavior of additively-manufactured resin polymers, this study aimed to investigate the effect of varying gage lengths and UV post-curing durations on the torsional capacity, shear modulus, and energy absorption characteristics of these materials. Methods Torsion specimens were fabricated using vat photopolymerization (VPP) with AnyCubic UV Tough Resin. The specimens were prepared with different gage lengths (20, 40, 60, and 80 mm) and were subjected to five UV post-curing durations (0, 15, 30, 60, 90, and 120 min). Monotonic torsion was applied to the specimens until failure at a rate of 0.1 revolutions per minute. Results The tests revealed ductile failure patterns across all specimens. Longer post-curing times were found to correlate with increased torsional capacities and shear moduli. However, conclusions regarding energy absorption per unit volume remained inconclusive. The results showed that UV exposure had a significantly greater impact on the mechanical properties of the specimens compared to the gage length. Additionally, a normalized trilinear model was proposed to characterize the behavior of additively-manufactured resin polymers under monotonic torsion, which facilitates numerical simulation of material responses in finite element software.

Constructing a novel controllable interface structure through the anchoring effect of α-cyclodextrin at cryogenics to enhance and toughen the mechanical properties of epoxy resin

The fracture toughness of an epoxy resin (EP) often decreases under cryogenic conditions, primarily because of performance degradation caused by molecular chain freezing. In this study, a high-tensile-strength and high-fracture-toughness EP-based nanocomposite (EP/CPN–CuO) was synthesized using α-cyclodextrin (α-CD) for anchoring. The α-CD immobilized flexible linear polymers grafted onto the surface of CuO nanorods (NRs) with negative thermal expansion within a novel interface with the EP. The composite exhibited enhanced mechanical properties because the α-CD effectively hindered the curling of polymer chain segments and considerably improved the chemical bonding between the EP and CuO. Experimental results demonstrated the enhanced mechanical performance of EP/CPN–CuO under cryogenic conditions compared with that of other materials reported in the literature. EP/CPN-CuO-2.0 exhibited a tensile strength of 111.40 MPa, a Young’s modulus of 6.67 GPa, and a fracture toughness of 2.69 MPa·m1/2, marking increases of 67.4 %, 10.8 %, and 100.7 % compared to pure EP. Thus, this study effectively resolved the trade-off between the tensile strength and fracture toughness of an EP under cryogenic conditions, providing a new pathway for the widespread application of EPs in cryogenic environments.

Mechanically robust, highly toughened, corrosion and impact resistant epoxy/silica nanocomposites by UV curing 3D printing technology

In this paper, a photosensitive resin was successfully synthesized using epoxy as a matrix and the effect of nanosilica on its properties was investigated. Micromorphology analyses show that the nanosilica has good dispersion and strong interaction with the matrix. Additionally, a finite element model was developed to predict the tensile performance of the nanocomposite under high-strain loads. Molecular dynamics simulations demonstrated a favorable binding energy between nanosilica and epoxy resin. The effects of nanosilica on the fracture toughness and energy release rate of photosensitive resins were investigated using load-enhanced tensile test method. The results showed that the addition of 1.0 wt.% nanosilica particles increased the toughness of the resin from 0.45 MPa m1/2 to 0.79 MPa m1/2, and the energy release rate from 248.3 J/m2 to 555.7 J/m2; compared with the neat photosensitive resins, the incorporation of nanosilica increased the tensile and impact strengths of the resins by 26.8% and 49.2%, respectively. The nanosilica was used to improve the tensile strength and impact strength of the resin by 26.8% and 49.2% respectively compared with the neat photosensitive resin. Electrochemical corrosion analysis showed that the photosensitive resin/nanosilica composites have excellent corrosion resistance. Under different corrosion environments of acid, alkali, and salt, the addition of 1 wt.% nanosilica in the photosensitive resin composite led to an increase in corrosion voltage by 0.023 V, 0.004 V, and 0.1 V respectively compared to neat photosensitive resin. Additionally, the corrosion current density decreased by 1.39 × 10−6 A/cm2, 0.525 × 10−4 A/cm2, and 2.57 × 10−6 A/cm2, respectively. On this basis, the independently synthesised photosensitive resin has excellent strength and 0.01 mm printing accuracy.

Study on Preparation, Structure, and Properties of Flexible Shape Memory Epoxy Resin

To improve the toughness of epoxy resins, we add N, N-dimethylformamide (DMF) to epoxy resin as it is curing, and the flexible epoxy resin is prepared. According to the results of Fourier Transform Infrared Spectroscopy (FT-IR), DMF is able to effectively graft onto the epoxy resin. The glass transition temperature (Tg) of the epoxy resin drops from 99.9°C to 19.4°C, indicating a reduction in the thermodynamic stability of DMF/epoxy, according to the results of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). According to tensile studies, DMF/epoxy's mechanical strength is decreased, but its elongation is significantly longer and enhanced by three orders of magnitude. Impact testing reveals a significant improvement in the material's hardness (from 1.67 to 15 J·cm-2). Furthermore, DMF/epoxy is flexibly bendable. Finally, the DMA test shows that DMF/epoxy can achieve good shape memory at low temperatures to room temperature.

Research on toughening of in situ polymerized polyacrylate resin for liquid composite molding

AbstractThermoplastic polyacrylate resin, which can be polymerized in situ, has a broad application prospect. Addressing the issue of poor toughness of polyacrylate resin, a toughening method involving in situ polymerization of polyacrylate resin for liquid composite molding was presented in this paper. KH570‐modified silica nanoparticles were used as reinforcement. The study focused on the surface modification's impact on the dispersion stability of the nanoparticle suspension, the effect of nanoparticles on the reaction, and the mechanical properties of the resin. The results showed that the contact angle between modified‐silica and acrylate resin decreased from 79.3° to 9.96°, and the stability of the suspension was increased by 34.8%. With the increase of silica nanoparticles, the reaction speed of the resin initially decreased and then increased. This was due to the influence of KH570 on the surface of the nanoparticles and the changes in resin viscosity caused by the nanoparticles. The mechanical properties of polymerization products first increased and then decreased. When nanoparticles mass ratio of nanoparticle to resin was 5:100, the elongation at break was increased by 94.9%, the impact strength was increased by 287%. This paper provided some ideas for high‐performance industrial application of high‐performance in situ polymerization of polyacrylate resin.Highlights The thermoplastic polyacrylate resin that can be formed by liquid composite molding. A method for improving the toughness of resin used in liquid composite molding. Nanosilica modified with KH570 interferes with the reaction of acrylate resin. The nanosilica changes the crack propagation path.

Improving interlaminar fracture toughness and compression after impact strength of carbon fiber reinforced epoxy composites by interleaving electrospinning polyethersulfone nanofiber

AbstractThe effect of membrane thickness of electrospinning polyethersulfone (PES) nanofiber membranes on interlayer toughness and impact resistance of carbon fiber reinforced epoxy resin (CF/EP) composites are researched. Intercalation composites with different nanofiber membrane thicknesses, ranging from 10 to 50 μm, are tested at mode I and mode II interlaminar fracture toughness. The impact resistance of nanofiber membranes with different thicknesses is evaluated by the compression after impact (CAI) strength test. Moreover, nanofiber toughening contributions are investigated using the crack path and surface analysis. Results indicate that PES nanofibers increase the toughness of interlayer resin and change the interlaminar crack propagation path of CF/EP composites. The optimum nanofiber membrane thickness for mode I (GI = + 58%) and CAI (CAI strength = + 33%) is 50 μm, while for mode II is 30 μm (GII = + 16.4%). The storage modulus of CF/EP composites increases with the increase of nanofiber membrane thickness. The study also confirms the insertion of a nanofiber membrane slightly improves the tensile strength and interlaminar shear strength (ILSS) of the CF/EP composites.Highlights PES nanofiber membranes of different thicknesses were inserted into the CF/EP. CAI and GI improved by 33% and 58%, respectively of CF/EP composites. The relationship between interlayer fracture toughness and CAI was discussed.

A tough, strong, and fast-curing phenolic resin enabled by quercetin-functionalized hyperbranched polymer

Phenolic resins are widely utilized in outdoor and structural wood-based panels; however, their high curing temperatures and brittleness have constrained their potential applications. This study developed a fast-curing phenolic resin (HPAQ/PF) with enhanced toughness and strength, achieved by incorporating a quercetin-functionalized hyperbranched polymer (HPAQ) into a phenol-formaldehyde (PF) resin. The HPAQ was synthesized by grafting biomass-derived quercetin onto an amino-terminated hyperbranched polymer. The phloroglucinol structure of quercetin, in conjunction with the amino groups, significantly accelerated the curing process of the HPAQ/PF resin. Consequently, the gel time was reduced from 593s to 274s, while the initial and maximum curing temperatures decreased from 155.6°C and 202.4°C to 128.7°C and 171.7°C, respectively. The moisture uptake value of the HPAQ/PF resin was reduced from 28% to 7% compared to the PF resin. The boiling water bonding strength and debonding work of the HPAQ/PF resin were measured at 1.75MPa and 0.780J, respectively, which were 51% and 105% higher compared to the 1.16MPa and 0.380J of the PF resin. These improvements were attributed to the enhanced compatibility and strong interfacial interactions between HPAQ and the PF chains, as well as the unique branched structure and intramolecular cavities of HPAQ. This study presents a simple and effective approach to enhance the curing speed and toughness of phenolic resins.

Effect of hollow beads content in aluminum oxide hollow beads reinforced epoxy composites on mechanical and energy absorption properties of the composites

AbstractAluminum oxide hollow microbeads/epoxy resin composite is a kind of epoxy resin‐based multi‐porous energy‐absorbing material. This study improved the brittleness and toughness of epoxy resin. Adding hollow aluminum oxide microbeads with different mass fractions increased the energy absorption capacity. Quasi‐static compression tests were carried out at room temperature to test the compression properties of epoxy resin/hollow microbead composites. The composites′ energy absorption properties and energy absorption efficiency were analyzed and calculated using the obtained compression curves. The fracture characteristics and microscopic morphology of the composite specimens were observed by scanning electron microscopy. It was found that aluminum oxide hollow microbeads, as reinforcement material, can effectively improve the brittleness and yield strength of epoxy resin materials and enhance the energy absorption performance and energy absorption efficiency of composite materials. With the increase in the mass fraction of hollow microbeads, the energy absorption performance of the composite material first increases and then decreases. Its performance is the most significant when the mass fraction of aluminum oxide hollow microbeads is 10 %.

Phenyl Propyl Polysiloxane‐Modified Epoxy Resin III: The Reaction Condition, Phase Structures, and Macroproperties

ABSTRACTPolysiloxanes are known to significantly enhance the toughness and thermal stability of epoxy resins. However, unsatisfactory grafting or copolymerization often occurs due to compatibility issues between the two materials, resulting in noticeable phase separation and a significant reduction in strength. In this paper, the copolymerization extent of epoxy resin with polysiloxanes was enhanced through solution polymerization by refining the synthesis process. The investigation explored the impact of polymerization process parameters on the reaction extent, phase structure, and mechanical properties. The results of refractive index and epoxy value showed that the extent of copolymerization ceased to increase after a 3‐h reaction duration at 15°C, 25°C, and 40°C. The results of FTIR and NMR showed that the lower the reaction temperature, the higher the extent of copolymerization. The toughness and strength of the resins copolymerized at 15°C increased simultaneously, while the strength of the resins copolymerized at 40°C decreased. The SEM results showed that the higher the extent of copolymerization, the finer the size of the second phase of the resins and that controlling the size of the second phase to an average of about 600 nm is the key to the strengthening of the resins. It is found that a low temperature is more favorable for the occurrence of a copolymerization reaction between polysiloxanes and epoxy resin, and it is pointed out that the relationship between the extent of reaction, phase structure, and macroscopic properties is an important guide for the work on siloxane‐modified epoxy resins.

The Influence of Matrix Resin Toughening on the Compressive Properties of Carbon Fiber Composites.

The study investigated the effects of a toughening agent and micron-sized toughening particles (TP) on the resin and carbon fiber-reinforced polymer (CFRP) composites, with a particular focus on compressive strength. The results showed that the addition of the toughening agent improved the overall mechanical properties of both the resin and CFRP but had a minor effect on the residual compressive strength (CAI) of CFRP after impact. Compared to the pure toughening agent, the addition of TP increased the CAI, GIC, and GIIC of CFRP by 74%, 35%, and 68%, respectively. The SEM, ultrasonic C-scan, and metallographic microscopy were used to analyze the failure morphology and TP distribution. Compared to pure toughening agent modification, the introduction of TP led to the formation of continuous toughening particle layers, which reduced the compression damage area by 61%, significantly balancing and absorbing the load. This modification also resulted in typical kink band damage. This study found that resin toughening significantly improved the compressive strength of CFRP, while micron-sized toughening particles, in the form of toughening layers, notably improved the CAI. These findings provide valuable insights for enhancing the compression and impact resistance of CFRP.

Improving impact strength and fracture toughness of epoxy resin through oligoester—A byproduct derived from the unsaturated polyester resin manufacturing process

Improving impact strength and fracture toughness of epoxy resin through oligoester—A byproduct derived from the unsaturated polyester resin manufacturing process

Investigation the potential of imide covalent organic frameworks (COFs) to enhance the toughness and mechanical properties of epoxy resin

The inherent brittleness of epoxy resins poses a significant challenge to the mechanical performance of epoxy-based composites. Aiming to overcome this limitation, the integration of nanomaterials has been proposed as an innovative strategy to enhance toughness and mechanical properties. Among these materials, covalent organic frameworks (COFs) stand out due to their crystalline structure and potential for diverse applications. This study focused on the synthesis of imide-based COFs and it characterized their crystalline structure and surface morphology using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) analysis, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) images. To evaluate the mechanical and thermal properties, epoxy composites containing 0.1–0.5 wt% COFs were tested. The integration of COFs resulted in substantial improvements in toughness and thermal stability. Notably, fracture energy increased by 318 %, modulus by 83 %, and tensile strength by 120.5 % at the optimal COF loading of 0.25 wt%. These findings highlight the effectiveness of COFs in significantly enhancing not only toughness but also overall mechanical performance, including tensile strength and modulus, of epoxy composites.

The intramolecular aggregation of phosphaphenanthrene groups and benzene-terminated effect within linear phosphonate oligomers effectively enhanced the flame retardancy and toughness of epoxy resin

To explore the potential of a flame retardant molecular structure that simultaneously enhances the flame retardancy and physical properties of epoxy resin (EP), benzene-terminated linear phosphonate oligomers Bz-DQPC-n were synthesized. Compared with the previously prepared linear bisphenol phosphonate oligomers DQPC-n, the benzene-terminated effect of Bz-DQPC-n molecules endows EP composites with better flame retardancy and toughness. In the vertical combustion (UL 94) test, Bz-DQPC-n/EP reached a V-0 rating. For the Bz-DQPC-2 molecule, the results revealed that under the same phosphorus contents, the limiting oxygen index (LOI) value of the Bz-DQPC-2/EP reached 38.2 %, which was higher than that of DQPC-2/EP. Furthermore, the peak heat release rate (pk-HRR) and total heat release rate (THR) of Bz-DQPC-2/EP were 677 kW/m2 and 83 MJ/m2. These values decreased by 54.7 % and 27.2 % in comparison to pure EP, respectively. In addition, the incorporation of Bz-DQPC-n can enhance the glass transition temperature (Tg) of EP composites. The flame retardant mechanism research demonstrated that Bz-DQPC-n molecules produced phosphorus-containing free radicals and aromatic compound fragments during gas-phase pyrolysis. These phosphorus-containing free radicals can interrupt or inhibit the combustion chain reaction process. A proportion of the aggregated phosphaphenanthrene groups decomposed to produce aromatic compounds that remained in the condensed phase, thereby enhancing the quality of the char layer. The investigation of the impact of the end-capping effect within Bz-DQPC-n molecules on the flame retardant behavior of EP composites offers a valuable reference for designing phosphaphenanthrene compounds with high flame retardant efficiency.

Parameter-Independent Deformation Behaviour of Diagonally Reinforced Doubly Re-Entrant Honeycomb.

In this study, a novel unit cell design is proposed, which eliminates the buckling tendency of the auxetic honeycomb. The novel unit cell design is a more balanced, diagonally reinforced doubly re-entrant auxetic honeycomb structure (x-reinforced auxetic honeycomb for short). We investigated and compared this novel unit cell design against a wide parameter range. Compression tests were carried out on specimens 3D-printed with a special, unique, flexible but tough resin mixture. The results showed that the additional, centrally pronounced reinforcements resulted in increased deformation stability; parameter-independent, non-buckling deformation behaviour is achieved; however, the novel structure is no longer auxetic. Mechanical properties, such as compression resistance and energy absorption capability, also increased significantly-An almost four times increase can be observed. In contrast to the deformation behaviour (which became predictable and constant), the mechanical properties can be precisely adjusted for the desired application. This novel structure was also investigated in a highly accurate, validated finite element environment, which showed that critical stress values are formed in well-supported regions, meaning that critical failure is unlikely. Our novel lattice unit cell design elevated the auxetic honeycomb to the realm of modern, high performance and widely applicable lattice structures.

Ultratough, Robustness, and Reprocessable Thermoset Epoxy Resins Synergistically Enhanced by Hierarchical Coordination Interactions and Dynamic Covalent Networks

AbstractEpoxy resins, ubiquitous and indispensable thermosetting material in various industries, suffer from the resistance to crack initiation, poor ductility, and irreparable permanent cross‐linked network, which hinder their utilization in high‐performance applications and are detrimental to the development of a sustainable economy. However, achieving the trade‐off between toughness, robustness, and reprocessability of epoxy resins remains a formidable challenge. Herein, an epoxy resin that combines ultratoughness, robustness, and reprocessability by incorporating a hierarchical crosslink structure embedded in a transesterification network is reported. The construction of hierarchical coordination structures facilitates formation of dense nano‐hard domains, enabling enhancement of both strength and toughness at multilength scales. As a result, the epoxy resin, integrating covalent adaptable networks with sacrificial non‐covalent networks, exhibits exceptional elongation at break (280%), modulus (1.8 GPa), stress at break (56.3 MPa), and tensile toughness (142 MJ m−3), showcasing its excellent endurance and ability to undergo multiple reprocessability. The application of this epoxy resin in carbon fiber‐reinforced polymer composites further underscores its potential as the resulting HCEV‐CFRPs exhibit unprecedented tensile properties and facilitate multiple non‐destructive recycling of high‐value carbon fiber under mild conditions. This research provides novel design principles for recyclable and high‐performance materials that combine strength and toughness.

Bio-based liquid crystal epoxy resins: Toughening and strengthening of conventional epoxy resins with strategically extended spacer layers

Liquid crystal epoxy resin, as an ideal toughening agent, combines the features of liquid crystal ordering and network cross-linking, which can effectively optimize the comprehensive performance of blended epoxy resins and achieve an ideal balance of rigidity and toughness. Here we successfully synthesized rigid and flexible bio-based liquid crystal epoxy resin (THBR-EP) by finely tuning the length of alkyl side chains. Using aromatic diamine as curing agent, a homogeneous network without phase separation was constructed by taking advantage of the different activity but good compatibility with ordinary epoxy resins, which significantly improved the toughness of the blended system. Specifically, only a small amount of THBR-EP(2.5 wt%) was required to exhibit a maximum impact strength of 48.8 kJ/m2. Moreover, the increase in system toughness was accompanied by a benign improvement in flexural strength, modulus and thermal stability. The ordered structure of the liquid crystals and their good compatibility with the resin matrix enhanced the ability to inhibit crack extension and energy dissipation. The feasibility to simultaneously achieve effective toughening and other property improvements of common resins broadens the application of resins under various demanding scenarios.

Improved fracture toughness of epoxy resin reinforced with micro‐sized lotus fibers pre‐ and post‐sodium hydroxide treatment

Improved fracture toughness of epoxy resin reinforced with micro‐sized lotus fibers pre‐ and post‐sodium hydroxide treatment

High-performance naphthalene-based photocurable epoxy resin for advanced printed circuit boards coatings by optimizing fluorodiamine-mediator extension chemistry

Despite the great progress in alkali developing photocurable resins for electronic packaging, the continuous development of high-frequency communication technology still poses a great challenge to the high heat resistance, toughness, robustness, and dielectric properties of photocurable resins. In this paper, a simple and feasible method is proposed to prepare a series of naphthalene-based photocurable resins with excellent thermal/mechanical properties and performance by introducing four selected fluorodiamine molecules into 1,6-naphthalene diglycidyl ether (NDE), respectively, and employing maleic anhydride (MA) as the alkali developing functional component. Among them, the effects of MA on the photocuring kinetics and thermo-mechanical properties of the resins were systematically investigated. Most importantly, the high functionality molecules obtained by diamine chain extension effectively improved the properties of the photocured films. As a result, two of the cured films exhibited excellent toughness (3.00 ± 1.39 MJ cm−3 and 4.55 ± 1.16 MJ cm−3), excellent heat resistance (212 and 195 °C), low dielectric constants (2.84 and 3.25), and low dielectric losses (0.0024 and 0.0068). Finally, the fast alkali development capability possessed by these two resins was verified, demonstrating their potential for technical application in real packaging boards and providing an effective strategy for the design and manufacture of high-performance naphthalene-based inks.