JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Hongjun Xu,Jianqiang Pan,Changbiao Chen,Songmei Zhao,Jiahao Xiao,Hui Wang,Xinxing Wu,Shuaibo Han,Yan Zhang,Fangli Sun
To improve the reactivity and compatibility of lignin, it was first functionalized via the method of epoxidation. The epoxidized lignin (LEP) modified epoxy resin with good mechanical and shape memory performance was fabricated ingeniously by introducing the LEP into the epoxy resin homogeneously with the aid of synergistic dispersion and crosslinking of polyetheramine without using organic solvents. The effect of LEP addition on the curing reaction, thermal, mechanical, and shape memory performance of epoxy resin were intensively evaluated. The epoxy-diamine curing reaction was promoted by the LEP incorporation, and the thermal stability and mechanical performance of epoxy resin were improved. The tensile strength and modulus of the LEP-modified epoxy were increased by 14.3% and 32.5%, respectively. Such reinforcing effect of LEP on the thermal and mechanical performance was contributed to the rigid LEP chains which were chemically crosslinked into the network of epoxy resin uniformly. Also, the rigid LEP component in the cured epoxy resin inhibited the movement of chain segments, which could enhance the mechanical stability and slow down the rapid shape recovery rate of the epoxy resin network to some extent.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Hongwei Zhou,Hongjin Li,Yao Yan,Rong Yang
Liquid crystal elastomers (LCEs) are liquid crystal polymers with moderate crosslinking that exhibit elasticity in both their isotropic and liquid crystal states. These materials can be programmed through chemical design and geometric configuration to achieve autonomous actuation at specific temperatures. Typically, the autonomous actuation temperature of LCEs exceeds the phase transition temperature of their isotropic states, with most reported LCEs requiring temperatures above 100°C. Such high temperatures pose challenges for use in soft robotics due to increased energy consumption and limited operational flexibility. In this study, we introduce a small amount of polycaprolactone (PCL) into the main chain of LCEs, effectively lowering their phase transition temperature while maintaining over 90% of the reversible shrinkage strain characteristic of pure LCEs. By adjusting the PCL content, the number of twists, and the helix density, we successfully obtained an LCE-PCL actuator with improved autonomous actuation performance at temperatures ranging from 45°C to 105°C. Moreover, by modulating the degree of torsion and the operating temperature, the LCE-PCL autonomous actuator demonstrates the ability to perform complex motions, such as reversing and parking. This work offers new insights into the design and application of LCEs with reduced phase transition temperatures and enhanced self-driving capabilities.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Shujun Zhao,Jiehao Qu,Shengjiong Yin,Xiangdong Liu,Hu Zhu
Constructing self-repairing epoxy materials based on transesterification chemistry can be regarded as a potential path for practical industrial applications given on its simplicity and ease of processing. However, there is still a challenge to improve the slow bonding exchange process for desired healing performances. Herein, this work reports a simple and effective strategy to prepare high-biomass-content self-repairing epoxy materials by introducing polyester oligomer (PEO) dicarboxylic acid as modifier into epoxidized soybean oil and itaconic acid compounds. The PEO is synthesized from glutaric anhydride and 1,4-cyclohexanediol, as well possess a unique pentamer molecular structure. It not only endows the epoxy system with improved molecular mobility in virtue of its long-chain structure, but also increases the number the essential ester groups of transesterification process, thus synergistically promoting bonding exchange rate for expected properties. As a result, the employment of PEO decreases the activation energy from 100 to 70 KJ/mol, as well as presents optimized self-repairing efficiency in storage modulus and tensile strength tests compared to the control group. It may provide a new and practical way to fabricate high-effective self-repairing epoxy system for industrial applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yiliang Fang,Lifeng Cai,Chongqing Deng,Xiaoyan Ma,Luyao Wang
Low-temperature cured epoxy resin (EP) is a suitable resin system for bonding thermal and temperature-sensitive devices, which can also reduce energy consumption and production costs. In order to further broaden the application range of low-temperature curing EP systems in amine-sensitive environments, in addition to selecting a well-compatible curing agent, an effective rubber to form a three-dimensional network structure with the resin matrix, so as to significantly improve the toughness of the EP. In this work, two kinds of triblock liquid rubber hydroxy-terminated polypropylene glycol-polybutadiene-polypropylene glycol (HTPO-PB-PO) and hydroxy-terminated polyphenylethylene oxide-polybutadiene-polyphenylethylene oxide (HTSO-PB-SO) with controlled molecular weight are synthesized and adopted to improve the mechanical properties of cured EP with methyl hexahydro phthalic anhydride (MEHHPA). It is found that all triblock liquid rubber-modified epoxy systems can be cured below 100°C, and the curing mechanism is similar to that of the pure EP system. Compared with the original pure EP, the impact resistance of modified samples is significantly improved, and the glass transition temperature ( T g ) is similar, among which the best impact strength of modified EP can reach 16.22 kJ/m 2 , 62.7% higher than that of the pure sample with only slightly reduced thermal decomposition temperature. These results can provide a low-temperature curing resin material with excellent mechanical properties, high dimensional accuracy, and high heat resistance for amine-sensitive environments while reducing costs due to high-temperature components and energy consumption.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 3
·e56365
·
IF 2.7
Jingbo Wu,Jianghua Lin,Wenhao Xiao,Ruijie Xu,Caihong Lei
Nucleating agents are crucial for modifying semi-crystalline polymers, but the impact of different end-group structures on crystallization behavior remains unclear. This study synthesized succinic dihydrazide nucleating agents with various end groups (methyl, ethyl, and tert -butyl) for PET composite materials. The tert -butyl-terminated nucleating agent showed the best performance, increasing the crystallization peak temperature to 203.8°C, crystallinity to 27.3%, and reducing half-crystallization time to 2.8 min at 220°C. It also enhanced the impact strength to 47.2 kJ·m −2 and flexural modulus to 2623 MPa, while improving Vicat softening temperature and heat distortion temperature by 41 and 8°C, respectively. The results from FTIR and Raman Spectroscopy indicate that the interactions between the end groups of the nucleating agent and the C H bonds in the PET structure, the π–π interactions between the nucleating agent and the PET molecular structure, as well as the modulation of the PET chain conformation by the nucleating agent, are the primary factors contributing to the enhanced crystallinity of PET. This study provides a new approach for designing efficient nucleating agents for high-performance materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhaohuang Zhong,Lang Li,Siwei Yu,Xindong Li,Haike Li,Jianghui Jia,Jiaju Huang,Meng Cai,Wanfu Huang
With the growing complexity of separation systems, the application of thin film composite nanofiltration (TFN) membranes in organic solvent separation faces numerous challenges. To augment its solvent stability, an in-situ constructed dopamine hydrogel doped with UiO-66@CNT was developed as an intermediate layer on a polyetherimide (PEI) ultrafiltration membrane. Subsequent interfacial polymerization on this interlayer led to the formation of a solvent-resistant nanofiltration membrane with a vast covalent bond structure, large specific surface area, and enhanced hydrophilicity. Our findings revealed that when the CNT loading in the UiO-66@CNT composite nanoparticles was 2 wt%, the TFN-U 2 C 2 membrane exhibited a maximum pure water flux of 126.32 L/(m 2 ·h) and a methanol flux of 45.45 L/(m 2 ·h). The rejection rates for Congo red aqueous and methanol solutions were 96.88% and 92.14%, respectively. The membrane also demonstrated commendable anti-fouling properties. Remarkably, even after 48 h of immersion in various organic solvents, the membrane retained its morphology and separation efficiency. Compared to the TFN-U 2 membrane without CNT addition, the enhancement in separation performance was considerably significant. Hence, this membrane has significant potential for application in treatment of wastewater containing organic solvents and is promising in related fields.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Yue Cao,Yanchen Wang,Xin Zhang,Bo Ren,Bo Wang,Xiaodong Yang
Due to the heterogeneity of the tumor, it is difficult to achieve complete ablation of the tumor by single photothermal treatment. Moreover, their broader use is constrained by the intrinsic high uptake in the reticuloendothelial system (RES) organs, resulting in slow elimination from the body and potential toxicity. In this study, we report a single-step synthetic approach to fabricate versatile FeCP-NPs, leveraging the coordination bonds formed between bioactive polyphenolic compounds (curcumin), Fe III ions, and polyvinyl pyrrolidone (PVP). The FeCP-NPs possess the following favorable characteristics: (1) The components of FeCP-NPs originate from natural products, an endogenous element, and an FDA-approved polymer, guaranteeing good biosafety. (2) FeCP-NPs exhibit excellent photothermal properties. (3) After the photothermal treatment is completed, the dynamic disassembly strategy triggered by deferoxamine mesylate (DFO) can induce the dissociation of nanoparticles and achieve rapid clearance in vivo. (4) Curcumin released during the disassembly of FeCP-NPs can be combined with photothermal therapy to achieve complete tumor ablation. A comprehensive analysis of the safety, biodistribution, and clearance patterns of FeCP-NPs is conducted in vitro or in vivo. This work provides a nanoparticle with great clinical translational potential and provides a new solution for inhibiting tumor growth.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 27
·e55594
·
IF 2.7
Zhen Zhang,Yue Wang,Shuai Lv,Hailin Cong,Youqing Shen,Bing Yu
In this work, a two-step activated swelling technique was effectively employed to successfully synthesize monodisperse porous poly(styrene-divinylbenzene) (PS-DVB) particles. Diazoresin (DR) transform an ionic bond into a covalent bond by photoreaction. Under ultraviolet irradiation, DR was used to covalently attach dichlorophenyl isocyanate to sulfonated PS-DVB microspheres. The novel photo-crosslinking reaction effectively overcomes the toxicity issues associated with conventional coupling agents and enables green production of chromatographic fillers. Modified PS-DVB particles were indeed commonly used as filler material for the separation of chiral compounds by high performance liquid chromatography (HPLC). The porous modified microspheres designed effectively separate benzoone, DL-mandelic acid, 2-phenylcyclohexanone, ibuprofen, 2-hydroxyl flavone, DL-cysteine, chloraniline maleate, hesperidin, and other chiral compounds by 100 mm column. It is noteworthy that the isocyanate-chitin modified microspheres are effective in separating chiral drugs (1000 μg/mL) within 5 min. Compared with ordinary microspheres, porous isocyanate-chitin modified microspheres showed better separation efficiency under the same conditions. The enhancement is attributed to the increase in their specific surface area. Consequently, they are a better choice of chromatographic packing matrix.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 48
·e56288
·
IF 2.7
Yue Sun,Jiale Zhang,Tao Chen,Yanting Zhang,Chonggang Wu,Xinghou Gong,Tao Hu
Silicone rubber (SR) is an ideal dielectric elastomer substrate due to its excellent flexibility and fast response speed. However, the innate low dielectric permittivity ( ε ) of SR generally requires a rather high driving voltage that restricts its widespread application. Typical attempts to increase ε of SR usually deteriorate either its flexibility or electrical stability. Herein, conductive multi-walled carbon nanotube (MWCNT) were first surface modified with polyphenols (PNs) (MWCNT@PNs), aiming to facilitate its well dispersion within SR matrix, which may maintain the softness and electrical stability of SR via suppressing concentrated physical crosslinking and local leakage current flow. Then, five-layered MWCNT@PNs/SR composites were prepared with the outer two insulating layers of SR while middle three dielectric layers of MWCNT@PNs filled SR. The multilayered structure further hindered the formation of conductive pathways through the composites, promising a high breakdown strength of the composites. Therefore, the multilayered MWCNT@PNs/SR composites exhibited increased ε , maintained low Young's modulus and electrical breakdown strength compared with pure SR of the same five-layered structure. Among them, the composite with uniformly distributed MWCNT@PNs (m-1: 1: 1) showed a highest actuation strain of 11.9% (at 19.6 kV mm −1 ), which was 4.1 times higher than that of SR (2.9% at 19.1 kV mm −1 ).
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zhuolin Zhang,Kangning Wu,Zichao Yang,Haoran Sui,Dongxu An,Chenhui Cui,Fusheng Zhou,Jianying Li
Replacing thermoset insulation by healable and recyclable covalent adaptable networks is a promising approach to the sustainable development of electrical and electronic devices. However, the repair performance gifted by dynamic covalent bonds always conflicts with the excellent mechanical properties gifted by stiff cross-linked networks. In this paper, by introducing dynamic thiocarbamate bonds, polythiourethane (PTU) with excellent mechanical properties and electrical insulation comparable to commercial epoxy resins are successfully developed, which exhibit superior healability and recyclability properties. Sub-centimeter scale electrical breakdown failures of the PTU samples could be efficiently self-healed with a healing efficiency up to 90%, while the storage modulus and volume resistivity exceeded 2 GPa and 10 16 Ω cm, respectively. Even though the electrical breakdown strength inevitably declined after multiple repair processes, PTU samples could restore their initial excellent insulation performance by simply reprocessing with the efficiency above 95%. Moreover, the efficient healability performance of large-sized electrical breakdown failures remained after the reprocessing. These outstanding characteristics underscore the tremendous potential of PTU materials as a new generation of sustainable high voltage insulation.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55920
·
IF 2.7
Yi Yang,Yin Lu,Kan Zhang
In this study, we designed and synthesized a series of norbornene-furan functionalized benzoxazine monomers ( HPAP-fa , HPAMP-fa , and HPTM-fa ) by regulating the bridge length in benzoxazine structure in order to improve the comprehensive performance of norbornene-furan functionalized benzoxazine system. This research systematically examined the impact of flexible segments on the structural information, polymerization behaviors, thermal stability, and flame retardancy of resulting polybenzoxazines. Initially, the structural characteristics of benzoxazine were confirmed through nuclear magnetic resonance, Fourier-transform infrared (FT-IR), and HR-MS. Subsequently, the polymerization mechanisms of each benzoxazine monomer were investigated utilizing differential scanning calorimeter and in situ FT-IR analyses. Finally, the thermal stability and flame-retardant properties were investigated by TGA and micro-combustion calorimetry measurements. Consequently, HPAP-fa exhibited the lowest polymerization temperature and the corresponding poly(HPAP-fa) showed very high thermal stability ( T d5 of 392°C and T d10 of 437°C) as well as excellent flame retardancy (HRC of 83.7 J g −1 K −1 ), which shows a significant improvement compared to poly(HPTM-fa) . As a result, the modulation of bridge segments within the monomer represents a viable approach towards enhancing the holistic efficacy of norbornene-furan functionalized benzoxazine systems.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Jiayi He,Yibin Chen,Jiyuan Wang,Sangrong Chen,Xingzi Lan,Maolin Liu,Xiaojie Chen,Weicheng Ou,Han Wang
In this study, LO (lavender essential oil) and PCL (polycaprolactone)-based nanofibrous membranes were successfully prepared using electrospinning technology. Due to the large specific surface area of the coaxial electrospinning nanofibers, the composite fiber membrane synthesized displays outstanding performance in the loading and release of LO. The study examines three common essential oils: Lavender Flower Oil (LFO), Lavandin Hybrida Oil (LHO), and Lavender Spike Oil (LSO). The results showed that this nanofiber membrane can effectively encapsulate LO, achieve long-term release, and exhibit long-lasting aroma and antibacterial effects. In terms of air filtration performance, the LHO/PCL membrane with an inner DMF (dimethylformamide) concentration of 5% has a significant filtration effect on PM2.5. In addition, in vitro antibacterial experiments show that LO/PCL nanofiber membranes have good antibacterial properties against Escherichia coli and Staphylococcus aureus , especially the LHO/PCL and LSO/PCL membranes. In summary, the LHO/PCL nanofiber membrane with 5% DMF demonstrated high filtration efficiency (quality factors is 0.13 Pa −1 ), sustained aroma retention for over 7 days, and exhibited antimicrobial properties, effectively inhibiting bacterial growth by 99% in testing. Therefore, the LO/PCL nanofiber membrane shows good application potential as an essential oil carrier in air filtration systems.
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高影响因子
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