POLYMER ENGINEERING AND SCIENCE
·
2017
·Vol. 58
·期 1
·103-111
·
IF 1.449
Bing Zhou,Zhubo Liu,Bin Xu,A.V. Rogachev,M.A. Yarmolenko,A.A. Rogachev
Polytetrafluoroethylene (PTFE) composite coatings doped with copper acetate and polyethylene (PE) were fabricated on rubber substrate by electron beam dispersion technique. The effects of dopant nature and glow discharge treatment on morphology, structural and tribological properties of the coatings were investigated. The results showed that Cu and PE doping change the surface structure of PTFE-based composite coatings due to the chemical reactions between the dispersion products. Cu-PE-PTFE coatings show the columnar and layered growth models without and with discharge treatment. Cu adding decreases the crystallinity, branched degree and unsaturated degree of PE coatings, but increases the branched degree and unsaturated bonds in the PE-PTFE coatings. Glow discharge enhances the crystallinity and ordering degree of composite coatings. Friction experiments indicated the significant difference of composite coatings in the nature of their destruction during friction. PE-PTFE coating is characterized of the brittle fracture with clear failure boundaries but Cu-PE-PTFE coating shows a rough surface without cracking and delaminating after friction. Cu doping increases the dynamic coefficient of friction of PE and PE-PTFE composite coatings, but discharge plasma decreases the dynamic coefficient of friction. Cu-PE-PTFE composite coating after discharge treatment has the decreased dynamic coefficient of friction and improved wear resistance. POLYM. ENG. SCI., 58:103–111, 2018. © 2017 Society of Plastics Engineers
研究领域:
材料科学
·
聚合物工程
·
表面改性
·
摩擦学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2016
·Vol. 56
·期 10
·1118-1124
·
IF 1.719
Weijian Xiong,Xue Gao,Dayong Gui,Xueqing Cai,Guiming Tan,Jianhong Liu
A liquid crystalline molecule, 4'-allyloxy-biphenyl-4-ol (AOBPO), was used to functionalize carbon nanotubers (CNTs) via physical means and chemical means, respectively. The physically functionalized CNTs (AOBPO-CNTs) and chemically functionalized CNTs (AOBPO-O-CNTs) were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), fluorescent spectroscopy, and Raman spectroscopy. The two functionalized CNTs were mixed with silicone resin as fillers to fabricate organosilicone nanocomposites. Scanning electron microscopy (SEM) images indicated that the dispersion of CNTs in silicone resin and compatibility of CNTs with silicone resin were improved effectively after functionalization with liquid crystal via physical or chemical means. The thermal and mechanical properties testing indicated that, the chemically functionalized CNTs got a better effect in improvement of mechanical properties of silicon resin than the physically functionalized CNTs, whereas the physically functionalized CNTs was more applicable to enhance the thermal conductivity of silicon resin. The tensile strength of AOBPO-O-CNTs/silicon resin increased by 37.8% over that of neat CNTs/silicon resin when the mass fraction of AOBPO-O-CNTs was 1.0%, and the elastic modulus of AOBPO-O-CNTs/silicon resin increased by 32.8% over that of CNTs/silicon resin if it came up to 2.0%. The thermal conductivity of the resin filled with AOBPO-CNTs was improved to be 1.176 W (m −1 K −1 ) at the mass fraction of 5.0%, which was enhanced more than 73.2% over that of CNTs/silicon resin. POLYM. ENG. SCI., 56:1118–1124, 2016. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
聚合物复合材料
·
纳米技术
·
热学性能
·
机械工程
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2014
·Vol. 55
·期 5
·1039-1045
·
IF 1.441
Huimin Qi,Hongdong Duan,Xingjian Wang,Xia Meng,Xiaocong Yin,Lina Ma
In this work, a series of porous terpolymers with degrees of crosslinking at 30–65% were synthesized by suspension polymerization. Fe 3 O 4 nanoparticles were used to modify the porous terpolymer with degree of crosslinking at 30%. The resulting terpolymers with mean pore size of 10–30 nm were used as supports for immobilization of cellulases through covalent bondings. The Fourier transform infrared spectroscopy and thermal gravity analysis measurements demonstrated that cellulases were immobilized onto the porous terpolymers. The effects of pH and temperature on enzyme activity were investigated in acetate buffer medium by hydrolysis of sodium carboxymethyl celluloses. The reusability of immobilized cellulases was also investigated. The result showed that immobilized cellulases exhibited higher residual activities and enzyme activities than free cellulases in wide ranges of pH and temperature. We also found that the reusability of cellulases immobilized on terpolymers with magnetism was better than that of cellulases immobilized on terpolymers without magnetism. POLYM. ENG. SCI., 55:1039–1045, 2015. © 2014 Society of Plastics Engineers
研究领域:
高分子科学
·
酶工程
·
纳米材料
·
生物催化
·
应用化学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2021
·Vol. 61
·期 5
·1415-1426
·
IF 2.428
Fangjuan Wu,Anlin Chen,Hanlu Pan,Denghui Li,Lingjie Zhang,Hui Fang,Xiangfang Peng,Elena Bekyarova
Three-dimensional boron nitride/graphene nanoplatelets (3D-BN-GNP) scaffolds were fabricated using an ice-templating method and polyamide 6 (PA6)-based composites were prepared by vacuum impregnation of caprolactam monomers into the scaffolds, followed by polymerization. The BN sheets in the PA6/3D-BN and PA6/3D-BN-GNP composites display a predominant parallel alignment along the ice-crystal formation constructing thermally conductive paths. The addition of few GNPs assists the dispersion of BN sheets in the PA6/3D-BN-GNP composites and repair the broken thermal paths caused by local agglomeration of the BN sheets. Consequently, GNPs play a morphology-promoted synergistic role in the enhancement of the thermal conductivity of the PA6/3D-BN-GNP composites. The PA6/3D-BN-GNP composite prepared with 23.40 wt% BN sheets and 2.60 wt% GNPs exhibits the highest thermal conductivity of 2.80 W m −1 K −1 , which is 833% and 33% higher than the values recorded for the pure PA6 and the PA6/3D-BN composite at BN loading of 26.18 wt%, respectively. Infrared imaging analysis revealed that the surface of the PA6/3D-BN-GNP composite has a fast response to heating and cooling, suggesting the potential of the composites in thermal management applications.
研究领域:
材料科学
·
热传导工程
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 5
·1641-1649
·
IF 2.573
Hui Fang,Anlin Chen,Lingjie Zhang,Sheng Chen,Fangjuan Wu,Hui Chen
Three-dimensional boron nitride/zinc oxide (3D-BN-ZnO) scaffolds were prepared by the ice-templating method, in which ZnO particles were in situ formed by sintering. Then, polydimethylsiloxane (PDMS)/3D-BN-ZnO composites were fabricated via vacuum infiltration of PDMS prepolymer into the scaffolds and curing. Compared with the composite prepared by simple blending, the thermal conductivity of the composite prepared based on the ice-templating method is much higher due to the excellent orientation of hexagonal boron nitride (hBN) sheets. Based on the same content of hBN sheets, the further introduction of 2.7 wt% ZnO particles formed in situ by sintering could promote the thermal conductivity of the composite to the value of 1.45 W m −1 K −1 , which is 70.6% higher than that of the PDMS/3D-BN composite. In addition, compared with the PDMS/3D-BN composite containing more hBN sheets, the PDMS/3D-BN-ZnO composite with 2.7 wt% ZnO particles possesses fewer fillers but higher thermal conductivity. It suggests that ZnO particles could synergistically improve the thermal conductivity. As revealed from the morphology of the composites, many ZnO particles are located between hBN sheets and thus construct thermally conductive paths. This study provides a new strategy for the design of thermal interface materials with high thermal conductivity.
研究领域:
材料科学
·
热管理技术
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2020
·Vol. 60
·期 5
·1044-1053
·
IF 1.917
Yang Yang,Jiming Gao,Ting Lei,Jun Yang,Jin Wang,Jie Liu
Polyimide (PI) composites with mixed fillers of BN flakes and SiC whiskers exhibit enhanced thermal conductivity and mechanical properties. In order to improve dispersion and interaction of these mixed fillers within the PI matrix, BN flakes were modified by a titanate coupling agent while SiC whiskers were oxidized at 750°C for 60 minutes to produce SiC @SiO 2 followed by silane coupling agent modification. PI composites reached a maximum thermal conductivity of 0.95 W/m K at volume fraction of mixed fillers of 27.6 vol% when the weight ratio of BN flakes to SiC @SiO 2 whiskers was 1:4. The enhanced thermal conductivity is likely attributed to the formation of heat conductive networks constructed by BN flakes and SiC @SiO 2 whiskers and the improved interfacial affinity between fillers and matrix. The optimized Nielsen-mold confirms the distribution and morphology of fillers affect the thermal conductivity of PI composites. In addition, SiC whiskers enhanced the mechanical property of PI composites and the influence of fillers on the mechanical property was further elaborated.
研究领域:
材料科学
·
复合材料工程
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 6
·1823-1832
·
IF 2.573
Zixin Liu,Huan Liu,Yan Wang,Haoran Yu,Jianying Wang
Hypercrosslinked polymers (HCPs) have aroused considerable attention due to their high chemical stability and potential applications in adsorption. A series of HCPs were prepared via one-step solvent knitting method using the cashew nut shell liquid (CNSL) as bio-based building block. Characterization of the prepared samples was performed by N 2 adsorption, Fourier transform infrared, Raman spectra, solid-state 13 C NMR spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy, and transmission electron microscopy images. Depending on the N 2 adsorption, the as-prepared CNSL-HCP4 exhibits the highest specific surface area of 93 m 2 ·g −1 and displays a uniform pore-size distribution. TGA results show that the decomposition temperature of the polymers exceeds 350°C. More significantly, the dynamic adsorption of high concentration of volatile organic compounds (VOCs) was investigated with CNSL-HCP4 under dry and humid conditions. The results show that the maximum adsorption capacity of o -xylene under dry conditions is 217 mg·g −1 and its corresponding adsorption amount (208 mg·g −1 ) decreases slightly under 30% relative humidity condition, indicating that CNSL-HCP4 had a hydrophobic surface. A little decrease in adsorption capacity of o -xylene on CNSL-HCP4 after five recycles confirms the reusability of the CNSL-HCPs. Therefore, CNSL-HCP4 is considered to be a promising candidate for potential adsorbent in recycling the VOCs from the exhaust.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 8
·2622-2640
·
IF 2.573
Ying Zhang,Lei Sheng,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
In the preparation of polyethylene (PE) microporous membrane, the stretching process of PE/liquid paraffin (LP) blend is of great significance for improving the mechanical properties and optimizing the pore size and its distribution. In this study, we have adopted a method that combines experimental investigation and numerical simulation to explore crystal structure transformation and residual stress distribution of PE matrix during the stretching process. First of all, the X-ray diffraction, small-angle X-ray scattering test, and tensile strength test are used to analyze these PE/LP blend samples that are processed at different stretching temperatures (110°C, 115°C, 120°C, 125°C) and different stretching ratios (2 × 2, 3 × 3, 4 × 4, 5 × 5). It is found that a higher temperature or larger ratio is beneficial for crystallizing of PE long chains and affecting the tension strength. After the extraction process, the obtained PE microporous membranes have more uniform pore size distribution and an increased pore diameter according to the results of scanning electron microscopy and porosity test. It is attributed to the fact that residual stress is more easily stored in the amorphous region of PE microporous membrane. PE microporous membranes can have higher crystallinity and well-dispersed crystal region by controlling a matched temperature and ratio. It is inspired for optimizing the technological parameters in industrial production.
研究领域:
材料科学
·
高分子物理
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 58
·期 12
·2256-2263
·
IF 1.551
Gang Li,Xiaonan Liu,Daohai Zhang,Min He,Shuhao Qin,Jie Yu
A series of poly(lactic acid)/hydroxyapatite/polydopamine (PLA/HA/PDA) composites were fabricated via soution blending and casting method using CH 2 Cl 2 as solvents. The physicochemical properties of the resulting composites were characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, thermogravimetric analysis, and Rheological analysis. Particularly, the in vitro degradation, hydrophilic of PLA/HA/PDA composites was systematically investigated. The influences of DA content on thermal stabilities, hydrophilic, and rheological behavior properties of composites were evaluated. The results showed that the addition of DA and HA not only improved the thermal stability of PLA, but also improved the hydrophilic of PLA-based composites. The obtained PLA/HA/PDA composites may be a promising material for load-bearing orthopedic implants. POLYM. ENG. SCI., 58:2256–2263, 2018. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
生物材料
·
高分子科学
·
生物医学工程
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 64
·期 2
·779-787
·
IF 3.2
Xiang Zhang,Zhenggang Xiao
Organic anticorrosion coatings (OACs) are the most effective, economical, and environmentally friendly protection strategy for metals. However, the traditional OACs usually inevitably suffer mechanical cracks during their service life. If not repaired in time, the resultant cracks in OACs will result in irreparable corrosion of the metal substrate. More detrimentally, these microcracks are not easily detectable at the initial stage. If OACs can autonomously heal their damage at the initial stage, the microcracks will be repaired in time and the metal substrate will be protected well. Thus, giving OACs the self-healing capability is a promising strategy for metal protection. Herein, an autonomously self-healing TiO 2 -reinforced silicone polyurea (SPU- g -TiO 2 ) elastomer was successfully designed as anticorrosion coating for Q235 carbon steel (QCS) protection. The SPU- g -TiO 2 elastomer matrix exhibited excellent stretchability with a maximum strain of 3826.72% and fast self-healing ability with an outstanding self-healing efficiency of 98.69% for 6 h without any external stimulus at room temperature. The QCS coated with SPU- g -TiO 2 showed excellent damage resistance and good anticorrosive ability, and it can self-heal the microcracks generated in its coating in time to prevent corrosive media corroding the internal mental substrate. This work has a positive guiding significance for the development of functional OACs to improve their protection for metallic materials. Highlights A bionic smart self-healing SPU- g -TiO 2 coating was successfully synthesized. The mechanical and self-healing properties are balanced using nanoparticles. The coating features excellent self-healing capability and stretchability. Q235 steel coated with SPU- g -TiO 2 shows good anticorrosive ability.
研究领域:
材料科学
·
腐蚀工程
·
聚合物化学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 58
·期 12
·2143-2148
·
IF 1.551
Juan Chen,Wenbo Zhang,Heyi Ge,Juanjuan Tan,Jianye Liu
The hybrids of graphene oxide (GO) encapsulated nano-SiO 2 (SiO 2 -GO) were introduced into phenolic resin (PR) to enhance thermal stability of PR. The effect mechanism was investigated in detail. Through electrostatic self-assembly method, the SiO 2 nanoparticles were evenly distributed onto the surface of GO. This structure could not only prevent the aggregation of nano-SiO 2 , but also alleviate the phenomenons of crimp and stack for GO sheets in PR. Nano-SiO 2 and GO showed elaborate synergistic effect on thermal stability of PR. Compared with the pristine PR, the 2 wt% SiO 2 -GO/PR composite showed higher T 5% , T 10% , and T dmax , which were increased by 65.39, 62.23, and 23.17°C, respectively. And the char yield at 800°C increased from 64.78% to 69.38%. Thus, SiO 2 -GO hybrids can facilitate the application of PR in the fields of heat insulation and ablation resistance. POLYM. ENG. SCI., 58:2143–2148, 2018. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2026
·
IF 3.6
Shaoming Li,Yaqi Ge,Yukun Zhou,Chuansheng Wang,Yao Xiao
Due to its high surface polarity and tendency to agglomerate, sepiolite exhibits weak interfacial bonding with the nonpolar natural rubber (NR) matrix, leading to poor mechanical and dynamic properties. This limits the high-value application of natural minerals in high-performance NR composites. In this paper, a hydrogen bond network-enhanced ternary deep eutectic solvent (CGA–DES) was prepared using glycerol and aspartic acid as dual hydrogen bond donors and choline chloride as the hydrogen bond acceptor. The effects of CGA–DES dosage on filler dispersion, vulcanization characteristics, mechanical properties, aging resistance, and dynamic mechanical properties of sepiolite/NR composites were investigated. SEM showed that CGA–DES promoted the dispersion of sepiolite and its interfacial bonding with NR. When 2 phr of CGA–DES were added, the processing flowability of the compound was improved, the vulcanization time was shortened, the mechanical properties and aging resistance were enhanced, and the rolling resistance decreased, resulting in the best overall performance. Compared with the unmodified Sep/NR, the tensile strength, tensile product coefficient, aging coefficient, and DIN abrasion volume of 2 CGA/Sep/NR reached 20.15 MPa, 11801.98, 0.32, and 0.198 cm 3 , which improved by 67%, 82%, 78%, and 21%, respectively. Meanwhile, the rolling resistance decreased by 54%, and better dynamic mechanical properties were achieved. Aspartic acid contains both carboxyl and amino functional groups, enabling the formation of an enhanced hydrogen-bonding network with sepiolite and facilitating more effective crosslinking reactions during the vulcanization process. This paper provides a new approach for regulating filler–rubber interfacial interactions by using a bio-based deep eutectic solvent, which is expected to promote the development of high-performance green tires and rubber products. Highlights The deep eutectic solvent was prepared by glycerol, aspartic acid, and choline chloride. The dispersion of sepiolite and its interfacial bonding with rubber were improved. The processing flowability was improved and the rolling resistance was decreased. The tensile strength and aging coefficient were improved by 67% and 78%, respectively.
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DOI
高影响因子
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