JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Wei Peng,Liting Wang,Mingyu Zhang,Deng-Guang Yu,Xiaoyan Li
Biodegradable conductive films are crucial for the sustainable development of wearable electronics. In this work, a flexible and degradable conductive film was prepared based on a carefully designed interface of polylactic acid (PLA) electrospun fibers and silver nanowires (AgNWs). The amphiphilic triblock copolymer was added to PLA solution for electrospinning, followed by solvent posttreatment to induce the hydrophilic block of the amphiphilic triblock copolymer to migrate to the fiber surface. Dopamine can be uniformly polymerized on the surface of hydrophilic PLA fibers, and the prepared PLA@PDA fiber film can form a good interface combination with AgNWs. The electrical conductivity of AgNWs/PLA@PDA flexible film can reach 258.5 S cm −1 , showing obvious Joule heating effect and good mechanical properties. Degradation experiments showed that in phosphate buffered saline , the PLA molecular chain showed a dynamic equilibrium due to the scission and rearrangement of the ester groups and degraded slowly, while AgNWs/PLA@PDA degraded rapidly under alkaline conditions. Our study provides a simple and controllable method to prepare flexible degradable electronic films, which is expected to be applied to flexible wearable bioelectrodes.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Xiuhong Li,Shuailong Zhang,Jiangzhou Li,Xinyu Hu,Jinjiao Zhang,Qiong Wei,Chupeng Zhang,Daode Zhang,Yong Liu
Various electrospun fibrous membranes have been addressed for oil/water separation owing to their advantages of high specific surface ratio, lightweight, and high porosity. However, they are commonly obtained by solution electrospinning of non-green raw materials, which could cause serious environmental issues. To realize effective oil/water separation, the optimal processing parameters for melt electrospun polylactic acid (PLA) were determined through orthogonal experiments. Subsequently, PLA fibrous films with cellulose nanofiber (CNF) or sodium chloride (NaCl) for oil/water separation were produced via melt electrospinning. The effects of incorporating CNF or NaCl on the physiochemical properties of melt electrospun PLA fibrous membranes were investigated. In contrast to the pure PLA membranes, the obtained PLA/CNF and PLA/NaCl composite membranes exhibit a finer average fiber diameter and an increased porosity. Also, the oil absorption characteristics and oil/water separation abilities of these fibrous membranes were experimentally studied. In contrast to the 84.55% oil/water separation efficiency of melt-electrospun PLA fibrous membranes, PLA/CNF exhibits the highest oil/water separation efficiency at 93.54%, whereas PLA/NaCl achieves a maximum efficiency of 90.29%. These findings show the applicability of the eco-friendly PLA-based melt electrospun fibrous membrane in the treatment of oily wastewater.
研究领域:
材料科学
·
环境工程
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Jiexiang Ren,Song Chen,Yudong Hou,Xiaocong Deng,Lu Tian,Chao Ma,Sheng-chao Huang,Cuifen Lu
A bio-based reactive flame retardant (PVD) was synthesized using vanillin, phenethylamine, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). This study aimed to enhance epoxy resin's fire resistance and evaluate the strength of EP/PVD composites for eco-friendly specialized applications. The chemical structure of PVD was confirmed using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The effect of PVD on the curing kinetics of EP was studied using non-isothermal differential scanning calorimetry (DSC). During combustion, PVD releases ∙PO 2 and ∙PO radicals, which capture the active ∙H and ∙OH radicals generated during the combustion of EP. This results in a significant quenching effect, thereby achieving flame retardancy. EP with 7.5 wt% PVD and 0.49 wt% phosphorus (EP/PVD-7.5) exhibited a V-0 rating in UL-94 vertical burning tests and a limiting oxygen index (LOI) of 32.4%. Additionally, compared to pure EP, EP/PVD-7.5 showed a 41.7% reduction in the peak heat-release rate during cone calorimetry tests. The dual-phase flame-retardant effect of PVD was confirmed by the analysis of the residual char and its pyrolysis behavior. Furthermore, EP/PVD exhibits superior mechanical properties and transparency compared to pure EP, indicating that PVD holds promise as a flame retardant for EP.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Miaomiao Zhu,Wenxuan Xu,Duo Wu,Zhuangcheng Liu,Yuanyuan Song,Aying Zhou,Ranhua Xiong,Chaobo Huang
Design and fabrication of pH-responsive nanofibrous membranes by biomaterials is a key step for drug delivery systems. Currently, there is an increasing attention on design of biocompatible nanofibrous drug delivery systems. Here, a bio-based pH-responsive nanofibrous membranes loaded with antibiotic were fabricated for the controlled release of tetracycline hydrochloride (TH). The in vitro drug release behavior of varied pH-responsive nanofibrous with different mass ratios of poly (lactic acid) (PLA) and cellulose acetate phthalate (CAP) was investigated to clarify the release mechanism. TH initial burst release within 20 mins was large than 97.5% for PLA/CAP/TH NFM under alkaline conditions (pH = 8). The antioxidant activity of TH loaded PLA/CAP NFMs are all higher than 55% after 30 mins. The prepared fibrous membranes possess sufficient antibacterial activity against both to Gram-negative and Gram-positive bacteria. At the same time, it also has good biocompatibility. Therefore, the fabricated nanofibrous membranes was demonstrated to be a pH-responsive nanoplatform for drug delivery.
研究领域:
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 4
·e56399
·
IF 2.7
Wenmin Mu,Chong Tian,Shijie Zhang,Tao Zhuang,Qing Yu,Liang Song,Guiqing Cheng,Zhongwei Wang,Yuxi Han
A fresh phosphorus-containing fireproofing agent (oxybis(4,1-phenylene))bis((2,5-dihydroxyphenyl)(phenyl)phosphine oxide) (ODDPO-HQ) was synthesized by a simple two-step reaction. The effect of ODDPO-HQ on the glass transition temperature ( T g ), crosslinking density, thermal stability, fire resistance, dielectric performances, hydrophobicity, and water absorption of epoxy resin (EP) was studied. EP/ODDPO-HQ containing 1.2 wt% phosphorus not only achieved the vertical burning V-0 grade with a limited oxygen index of 28.9% but also maintained good thermal stability. Compared to unmodified EP, its T g value has only decreased by 7.2°C. Detailed studies revealed that the excellent flame resistance of ODDPO-HQ for epoxies was ascribed to the flame suppression both in the gaseous phase and condensed phase, especially the obvious barrier effect. Although the water uptake of the modified epoxies slightly rose with the content of ODDPO-HQ caused by the reduction of the crosslinking density within the matrix, it did not adversely affect the properties of the polymer. The modified epoxies showed reduced dielectric constant and dielectric loss values, and the contact angle of EP/ODDPO-HQ samples increased as the flame retardant content rose, which might be due to the symmetrical structure of ODDPO-HQ reducing the polarity. Our study presents an easy approach for producing high-performance epoxies.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 20
·e55383
·
IF 2.7
Zi-Li Zhang,Bo Yang,Ya-Kun Xie,Yu Zhao,Qi-Yao Feng,Li-Juan Yin,Zhi-Min Dang
Dielectric elastomer actuator (DEA) is considered as an ideal artificial muscle with soft and light in nature, widespread application in soft robotics and sensors. Dielectric elastomer (DE), the core component of DEA, with high output force and large actuation strain under relatively low driving electric field is critical for high-performance DEA. However, the widely used VHB series (3M) DE suffered from very large pre-strain and high driving voltage to get their high actuation performance, limiting their scope of application. In this work, the DEs with good mechanical and dielectric properties were prepared via UV curing method consisting of acrylic acid (AA) with strong polar groups as functional monomer, n -butyl acrylate (BA) as soft monomer and urethane acrylate as cross-linker (c-p(BA-AA)). The c-p(BA-AA) DE films obtained the simultaneous increasing of dielectric constant and breakdown strength with the increasing content of AA, which guaranteed the good actuation performance. The c-p(BA-AA) film exhibited excellent actuating performance (44.11% actuation strain at 45 kV/mm) without pre-strain. Besides, a simple linear actuator based on the c-p(BA-AA) film could easily output weight that is tens of times of its own active weight (654.1 mN/g at 30 kV/mm).
研究领域:
材料科学
·
软体机器人技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Ai Ping Zhang,Wei Zhao,Xin Kang Li,Jun Bian,Ke Yang Ni,Ke Cheng Yang,Hai Lan Lin,Dai Qiang Chen
The main-chain benzoxazine (BA-ddm) and diamine-type benzoxazine (Ph-hda) were prepared by solution method, and a series of copolymers were prepared by mixing them at various mass ratios. Second, copolymer coatings (P(PB)) were prepared on the surface of the tinplate by dip coating and heat curing. The results of FTIR and 1 HNMR showed that the benzoxazine copolymer coating was successfully prepared. DSC test results showed that the copolymerization of two benzoxazine oligomers was promoted by the introduction of BA-ddm containing phenolic hydroxyl groups. The introduction of Ph-hda containing a long aliphatic chain provided the copolymer coatings with good hydrophobicity, as verified by the hydrophilicity and hydrophobicity tests. When the mass ratio of BA-ddm to Ph-hda was 1:19, the water contact angle and water absorption of P(PB5) were 100.1 0 % and 0.56%, respectively. The results of dynamic polarization curves and electrochemical impedance spectroscopy (EIS) indicated that different copolymer coatings had good corrosion resistance. Among them, the P(PB5) coating exhibited the best anti-corrosion performance, with a corrosion current of 5.15 × 10 −8 A cm −2 , a protection efficiency of 99.23%, and an impedance modulus of 1.78 × 10 7 Ω cm 2 at 0.01 Hz, which was nearly 5 orders of magnitude higher than the impedance modulus of the blank tinplate.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shihao Fan,Yi Liu,Wanglong Jia,Liuchun Zheng
Meta-aramid (PMIA) is a high-performance polymer known for its exceptional properties, however, its molecular chain arrangement and strong hydrogen bonding contribute to its rigidity and brittleness. Additionally, the lack of reactive groups in its molecular structure severely affects the dyeing properties of PMIA, and restrains its applications in various fields. To address these issues, this study introduced 4,4′-thiodianiline (4,4′-TDA) into the main chain of PMIA molecules through copolymerization modification. This approach enhanced the relative molecular weight of the copolymers, resulting in co-PMIAs with improved flexibility. The synthesized copolymers demonstrated excellent mechanical properties and thermal stability, maintaining high strength while improving toughness. Furthermore, the incorporation of this thioether-containing monomer also enhanced the dyeing properties and flame retardancy of PMIA. The modification strategy employed in this research offers valuable insights into the structural modification of aromatic polyamides, and the synthesized novel copolymers show promising applications in the field of protective clothing.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 46
·e56248
·
IF 2.7
Yangsong Li,Liya Fan,Xiaoxuan Xi,Xiaoyan Zhao,Xiao Zhu
Fiber separation technology has been widely used in the removal of metal ions, dyes, proteins, and particles. In this work, the reversible characteristic of temperature sensitive hydrogel which possesses the expansion and contraction at different temperature is used to control the change of internal pores of filter materials for achieving the selective separation and concentration of solution. We prepared polylactic acid (PLA) hollow fiber as outer support layer by the template method and PLA electrospun membrane as internal support diaphragm by electrospinning. Then, the method of adding poly( N -isopropylacrylamide) (PNIPAM) hydrogel in the hollow fiber layer by layer was adopted to form the hydrogel/PLA fiber. When the mass ratio of PNIPAM/PLA was 3/1, the sample presented the relatively tight interior morphology and was selected for protein separation. By adjusting the temperature, the rejection capacities of PNIPAM/PLA composite fiber for bovine serum albumin (BSA), and ovalbumin (OVA) were in the range of 25–36 mg/g and 22–31 mg/g, respectively. Furthermore, the fiber reusability was investigated by swelling and deswelling elution processes. It was found that the sample could be reused 5 times. This work explores a novel control method for the graded filtration and concentration of targets.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Chenglu Liang,Zhengyang Li,Yuan Chen,Yi Zhang,Yang Liu,Yukun Chen
Binders play a critical role in the preparation and operation of electrodes in lithium-ion batteries (LIBs). Developing new binding materials with high affinity to Li ions and resistance to higher voltages was desirable for the practical applications of LIBs. In this work, soluble polyimide binder (PI) with random copolymerized rigid-flexible segments were synthesized and evaluated as cathode binder for the typical lithium iron phosphate cathode material in terms of cycling performances, rate capability, and electrochemical impedance. By introducing the polar and soft ether segment into the rigid PI chains, the NMP-soluble PI precursors were obtained. The rigid-flexible segments in the PI binders work synergistically during the electrochemical process, in which the rigid segments of aromatic units with strong lithiophilic CO group provided the necessary mechanical support and affinity with electrolytes, while the flexible segments endow the high solubility and buffer effect to the volume change during the charge/discharge process. Moreover, the 3,5-diaminobenzoic acid (DABA) working as the crosslinking unit was introduced during the synthesis and the addition ratios were optimized. The as-optimized PI binders exhibited superior rate performances and comparable cycling stability when compared with the commercial PVDF binder, demonstrating the great potential for PI binder in the LIBs systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zheng Wang,Zhiwei Yang,Pengju Qiao,Jing Fang,Xingjiang Wu,Zhensheng Yang,Hao Li
Degradable polyvinyl alcohol (PVA) liquid mulch film is an effective alternative to traditional petroleum-based mulch. However, PVA has problems such as poor water resistance and high cost in practical applications. In this work, a liquid mulch film PCQ was prepared by simply blending quaternized lignin (QAL), carboxymethyl cellulose (CMC), and PVA. PCQ was characterized and analyzed through FT-IR, SEM, and other tests. The effects of QAL and CMC on the water resistance, barrier properties, water retention, soil-fixing properties, and degradation properties of PCQ were investigated. The results showed that the addition of QAL and CMC significantly enhanced the water resistance of the liquid mulch film and provided excellent UV shielding (90%) and water vapor shielding performance (249.3 g m −2 d −1 ). In addition, PCQ effectively immobilized topsoil, retained soil moisture, and improved seed germination. This study provides a new strategy for preparing environmentally friendly, low-cost, and degradable liquid mulch film.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 24
·e55511
·
IF 2.7
Shuxin Zheng,Yuxiang Nie,Zhangzhong Wang,Xin Feng,Jiahua Zhu,Xiaohua Lu,Liwen Mu
This work presents a design of a unique “roller wheel” structure combining rigid MXene and flexible liquid metal (LM), aiming to construct an epoxy composite coating with simultaneous advanced mechanical strength and lubrication properties. The antiwear property of the epoxy composites is improved by 72.8% when the LM is 0.5 wt% and MXene is 0.03 wt%. The incorporation of LM-MXene improved the mechanical properties of the epoxy composite coating, resulting in an approximately 136.6% increase in elastic modulus. The unique “roller wheel” structure provides additional mechanical support and leads to lower adhesion between the MXene layers and LM. As a result, LM reduces the stripping and sliding of the interface between MXene layers during the friction process, further enhancing the lubrication performance of the epoxy composite coating.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）