JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 22
·46326
·
IF 1.901
Weining Du,Yong Jin,Jiezhou Pan,Wuhou Fan,Shuangquan Lai,Xiaopeng Sun
Herein, we synthesized a series of polyurethane copolymers (PUs) with poly(1,4-butylene adipate) glycol as soft segment and 2,4-toluene diisocyanate as well as extenders including 1,4-butanediol and di(1-hydroxyethylene) diselenide as hard segment. The chemical structure, thermal property, crystallization behavior, shape memory, and self-healing performances of the PUs were systematically characterized by a series of experiments. It was found that the PU2 containing a higher diselenide component (∼33 mol %) exhibited both shape memory and self-healing behaviors under a moderate temperature (∼57 °C). Meanwhile, the PUs showed a good repeatability of shape memory function, and their fixity and recovery ratios were all above 90%. Additionally, the dynamic exchangeable feature of diselenide bonding endues the PUs chains with an acceptable reprocessability and self-healing performances, and the PU2 sample could be healed for five times by thermal treatment with the healing efficiencies above 70%. This work provides a heuristic perspective for the development of shape memory and self-healing materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46326.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 21
·46312
·
IF 1.901
Yangyang Zhao,Fuwei Nian,Hao Pang,Jianheng Huang,Hongwei Zhao,Kun Wang,Bing Liao
Star-shaped superplasticizers, which incorporated polyol ester with unsaturated bond at their cores and bore comb-type structures as their arms were synthesized via esterification-copolymerization in aqueous phase from pentaerythritol, acrylic acid (AA), and isopentenyl oxy poly(ethylene glycol ether) (TPEG). The monomer ratios of AA and TPEG were varied and comonomer sodium methallyl sulfonate (SMAS) bearing short side chains was added to regulate the arm structure of star-shaped polycarboxylate superplasticizers (SPCEs). The effects of the SPCEs on cement paste were investigated and the cement dispersion as well as early hydration mechanism were explored. As a main result, SPCEs with SMAS and certain molar ratios for anchoring groups and PEO side-chains in their arm structure exhibited good paste dispersion and fluidity retention, which also delayed the early hydration process and prolonged both the initial and the final setting time. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46312.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 23
·46346
·
IF 1.901
Liwen Wang,Yongjia Liu,Lei Bao,Dongdong Hu,Yuan Zong,Gangsheng Tong,Ling Zhao,Tao Liu
Poly(vinyl acetate- alt -dibutyl maleate)- block -poly(ethylene glycol) (PVDBM- b -PEG) copolymers were synthesized via reversible addition–fragmentation chain transfer radical polymerization and used as emulsifiers to form stable CO 2 -in-water high internal phase emulsions (C/W HIPEs). Then, highly interconnected cellular polyacrylamide (PAM) and poly(acrylamide- co - N -hydroxymethyl acrylamide) [P(AM- co -HMAM)] poly-HIPEs with enhanced mechanical strength were prepared based on the stable C/W HIPEs. The porous structures of the PAM poly-HIPEs, as well as morphology and compressive modulus, could be influenced by the surfactant concentration and the length of the CO 2 -philic tails of the surfactants. PAM poly-HIPEs with the smallest average pore diameter (11.12 ± 0.62 μm) and the highest compressive modulus (22.65 ± 0.10 MPa) could be obtained by using the short CO 2 -philic chains of the PVDBM- b -PEG surfactant at a high concentration (1.0 wt %). Moreover, with the copolymerization of N -hydroxymethyl acrylamide (HMAM) comonomers with acrylamide, the compressive modulus of the obtained P(AM- co -HMAM) poly-HIPEs was three times higher than that of PAM poly-HIPEs. Both PAM and P(AM- co -HMAM) poly-HIPEs were employed as scaffolds to guide H9c2 cardiac muscle cellular growth. Fluorescence images showed that a smaller average pore size and a narrower pore-size distribution were helpful for cell growth and proliferation on these materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46346.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 16
·46172
·
IF 1.901
Xiaojie Dong,Xiao Li,Zhenpeng Xie,Sen Weng,Weiying Zhang,Xiaoguang Ying
An absorbent for benzene series with silica/poly(styrene- co -butyl acrylate) core/shell structure was prepared via emulsion polymerization. The effects of emulsifier dosage, monomer concentration, and crosslinker dosage on the absorption of the core/shell composite particles were investigated. The composite particles with good absorbency could be obtained when the emulsifier concentration was 2.5 g/L, monomer concentration was 40 g/L, crosslinker dosage was 2.0% (based on the total mass of the monomer), and the initiator dosage was 1.0%. The composite particles exhibited a rapid absorption and the absorption process conformed to the quasi-second order kinetics. Fourier-transform infrared spectroscopy, scanning electron microscope, and energy dispersive spectrometer (EDS) showed the presence of copolymer layer on the surface of silica. The work provided a new path to fabricate novel composite absorbent particles for a wide range of applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46172.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56100
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IF 2.7
Miaomiao Tian,Yajie Chen,Qiaoran Zhang,Xiaowei Zhao,Xiaohong Li,Zhijun Zhang,Zhiwei Li
Organic flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was used to decorate the pores of mesoporous silica (m-SiO 2 ) nanospheres to prepare a new composite flame retardant (DK-SiO 2 ). The content of DOPO in DK-SiO 2 is about 17 wt%. Due to the chemical bonding, DK-SiO 2 not only enhances the flame retardant performance, but also effectively avoids adverse effects of DOPO on the glass transition temperature and mechanical properties of epoxy resin (EP). At 9 wt% loading, the limiting oxygen index of the EP increased from 25.7 to 31.2, and successfully passed the UL-94 V-0 rating. Besides, DK-SiO 2 can significantly reduce the peak heat release rate, total heat release, and total smoke production of EP, with reductions of 26%, 32%, and 20.8%, respectively. Compared with the simple blended sample, DK-SiO 2 not only has better flame retardant performance but also shows significant advantages in thermodynamic properties. The glass transition temperature, impact, and tensile strength, as well as storage and flexural modulus have been improved. This excellent flame retardant performance is mainly attributed to the gas-condensed synergistic flame retardant mechanism between DOPO and m-SiO 2 . The good thermodynamic performance is due to the excellent dispersion of DK-SiO 2 nanospheres in the EP.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·Vol. 141
·期 44
·e56190
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IF 2.7
Shifan Li,Conglin Dong,Chengqing Yuan,Xiuqin Bai
Marine water-lubricated bearings have the advantages of environmental friendliness and long replacement cycle. However, when under the complex lubrication circumstance, the frictional and vibrational behaviors of water-lubricated bearing always dissipate the mechanical energy output from the ship's diesel engine. Aiming at this problem and combining with previous research findings, in this paper, ceramic balls with similar mechanical properties to ship's main shaft were selected as the friction counterpart to simulate the operating conditions of marine water-lubricated bearing. Meanwhile, dual nanoparticles of tungsten disulfide (WS 2 ) and titanium dioxide (TiO 2 ) were used to modify ultra-high molecular weight polyethylene (UHMWPE) bearing material. The tribological and vibrational properties of the prepared composites were carefully investigated. The results showed that compared to pure UHMWPE, with the synergistic effect of 0.75 wt% WS 2 and 0.9 wt% TiO 2 , the frictional and vibrational behaviors of the composites were reduced by 43.3% and 42.7%. Mechanical testing and microscopic characterization revealed the enhancement mechanism of these nanoparticles on UHMWPE. This study proposed a design strategy on marine water-lubricated bearings for engineering application.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Jintao Huang,Haoxin Lv,Xiaojun Zhao,Jong-Min Lee,Yonggang Min
Overheating of electronic devices reduces lifespan and increases safety risks. The use of graphite films with high thermal conductivity to enhance thermal dissipation in electronic equipment is of significant importance. This study used urea-choline chloride (UCC) to modify polyimide (PI) films from two different monomer systems, which were then graphitized to prepare a novel graphite film with high thermal conductivity. The direct formation of hydrogen bonds between poly(amic acid) (PAA) and UCC facilitates the ordered structure during thermal imidization, enhancing the graphitization degree and thermodynamic properties of PI films. The results indicate that the graphitization degree of PI films increased from 30% to over 59% in the 4,4′-oxydianiline-pyromellitic dianhydride (OPU) system and from 80% to over 92% in the 4,4′-diaminobenzoyltiphenylamine-3,3′,4,4′-biphenyl tetracarboxylic dianhydride (DBU) system. Notably, 4,4′-oxydianiline-pyromellitic dianhydride-3.5 wt% urea-choline chloride (OPU35) and 4,4′-diaminobenzoyltiphenylamine-3,3′,4,4′-biphenyl tetracarboxylic dianhydride-3.5 wt% urea-choline chloride (DBU35) exhibited the highest thermal conductivity in their respective systems, with coefficients of 45 and 742 W/m K, representing 200% and 47.8% improvements over pure PI-based graphite films. This provides a new material for heat dissipation in electronic devices.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·
IF 2.7
Yuhan Wang,Huihuang Ma,Shuni Ying,Jianfei Gao,Xiaodong Zhou
Starch is considered an ideal alternative to petroleum-based plastics. However, the application of thermoplastic starch (TPS), which produced from cassava starch plasticized with glycerol, is limited by its hydrophilic, poor mechanical properties, and inadequate processability. In this study, dialdehyde starch (DAS) is used as crosslinker to modify TPS/poly(vinyl alcohol) (PVA), and DAS crosslinked cassava starch/PVA blends are fabricated by melt mixing method. Studies on the molecular structure of DAS crosslinked cassava starch/PVA blend indicate that the addition of DAS enhances the intermolecular interactions between cassava starch and PVA, resulting in the formation of a dense internal structure. The plasticizing torque and equilibrium torque of crosslinked cassava starch/PVA blends are increased and the tensile strength reaches 3.60 MPa, an improvement of 186% compared with TPS. Additionally, the water contact angle increases from 87.8° to 119.6° after modification. Compared with other crosslinkers, DAS has obvious advantages, making the DAS crosslinked cassava starch/PVA blend a biodegradable material with excellent properties and promising application prospects.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56104
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IF 2.7
Song Yang,Xiaoyu Chen,Peng Xu,Jianjun Shi,Qi Yao,Junning Li,Ziping Zhou,Guangxin Chen,Qifang Li,Zheng Zhou
Six varieties of alkoxy polyhedral oligomeric silsesquioxanes (POSSs) featuring methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, and n-hexoxy as terminal groups were synthesized using the direct dehydrogenation condensation method. These POSSs were then incorporated as cross-linking agents into hydroxy-terminated polydimethylsiloxane (HPDMS) to create various formulations of room temperature vulcanized silicone rubbers (RTV SRs), denoted as SRM, SRE, SRP, SRI, SRB, and SRH. The morphology, thermal stability, and mechanical properties of the resulting SRs are analyzed using scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and universal tensile testing machine. The findings indicate that the incorporation of POSS into SRs results in significant enhancements in thermal stability and mechanical properties when compared to the control group (TEOS/SR). SRB and SRH exhibit the highest cross-linking density and tensile strength. Specifically, SRB-4 demonstrates the highest tensile strength at 2.66 MPa, representing an 8.6-fold increase compared to TEOS/SR. The maximum decomposition rate temperature of SRP-4 reaches 527°C and is 194°C higher than TEOS/SR. Because the alkoxy groups with different chain lengths on POSS have different chemical reactivity, they have a great effect on the dispersion of POSS in SRs, which affect the cross-linking density, tensile strength, and thermal stability.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 20
·e55383
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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).
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 32
·e55745
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IF 2.7
Xin Chen,Jianyan Feng,Shuaishuai Han,Yang Bai,Peng Wang,Haoqiang Liu,Peng Zhang,Xiaomin Luo
With the implementation of the “plastic restriction order” and the demand for sustainable society development, biodegradable coatings derived from biomass materials have garnered significant interest. This study presents the synthesis of a double-salt bio-based waterborne polyurethane (PLA-WPU) by utilizing poly(lactic acid) polyol (PLA) and isophorone diisocyanate (IPDI) as the main raw materials, along with 2,2-dihydroxymethylpropionic acid (DMPA) and sodium ethylenediamine ethanesulfonate (A-95) as a hydrophilic chain extender. Synergistic reinforcement of PLA-WPU using hydrophobically modified cellulose nanocrystals (M-CNC) and polycarbonate diimide (PDCDA). At an M-CNC content of 3% relative to the effective mass of PLA-WPU, the tensile strength reached 36.12 MPa. After 8 days a lipase PBS solution, the degradation rate reached 54%. Excellent waterproof performance was observed, exhibiting a contact angle of 143.5°. When applied as a surface coating on kraft paper, the Cobb 60 value decreased from 74.0 to 28.6 g/m 2 , while increasing the tensile strength by 451.3%. Importantly, the kraft paper maintained excellent waterproofing, mechanical strength, and high barrier properties even after repeated folding, high and low-temperature conditions, and exposure to varying pH solutions. It proved to be both degradable and recyclable, making it a promising alternative to liner paper or plastic membrane, especially in food packaging.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 43
·e56125
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IF 2.7
Yong Liu,Shengtao Dai,Peipei Guo,Honglong Li,Zongwei Guo,Lei Shang,Yuhui Ao
Polyacrylonitrile (PAN)-based precursor fibers with different mechanical properties prepared by wet-spinning and its correlation with microstructure was researched, the primary structural factors that affecting its properties were analyzed. The tensile strength and modulus of precursor fibers increased from 4.63 cN/dtex to 9.16 cN/dtex and 99.09 cN/dtex to 168.92 cN/dtex, respectively, with the increase in crystallinity from 69.29% to 87.84% and orientation degree increased from 83.95% to 93.81%, high performance precursor fibers could be achieved by decrease in the crystallite size and interlayer spacing, these aggregation structure plays a decisive role to the mechanical properties of fibers. The integrality of aggregation structure and properties could reflected by boiling water shrinkage behavior and glass transition temperature from the side. The fracture morphology of fibers with different properties were studied by scanning electron microscope (SEM) and three fracture characteristics were observed, PF1 and PF3 presented the radial extended fracture without microfibril pull out, radial cluster fracture with the pull out of microfibril for PF2, PF4–PF6, together with the axial splitting pattern in PF6, which was revealed by microfibrils/fibrils in longitudinal and transverse combined with solution etching. Precursor fibers with less voids, without serious skin-core, continuous arrangement, tightly stacked, well-developed and complete oriented microfibrils/fibrils, exhibited excellent mechanical properties. Possible fracture process was given from the perspective of aggregation structure and microfibrils/fibrils, which become dominant factors determining properties of precursor fibers. Improve the performance could be achieved by regulating surface structure and cross-sectional shape. As one of the main structural factors that determining properties, by reducing diameter could minimize the numbers and sizes of defects.
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高影响因子
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