JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 33
·e52786
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IF 3.057
Zelin Hong,Xiangrong Chen,Guangyu Zhu,Muhammad Awais,Yiwen Shi,Hanshan Zhu,Hao Li,Ashish Paramane
The effect of adding electron-buffering voltage stabilizer (1 wt% m-aminobenzoic acid) on the electrical tree-induced degradation of cross-linked polyethylene (XLPE) was studied at high temperatures. The electrical tree inception, growth, and partial discharge characteristics were simultaneously analyzed at 30, 50, and 70°C, respectively. The results showed that the growth rate of electrical tree and partial discharge activity as well as the discharge repetition rate, significantly increased with the temperature for pure XLPE and XLPE stabilizer blend. However, the XLPE stabilizer blend exhibited higher tree inception voltage, lower tree growth rate, and partial discharge activity than pure XLPE. The addition of the voltage stabilizer reduced the carbon layer thickness in the tree channel and offered higher resistance to the electrical tree growth. Surface potential decay demonstrated that the voltage stabilizer addition decreased the trap energy level, but increased the shallow trap density of the XLPE. Quantum chemical calculations showed that the voltage stabilizer enhanced the ability to buffer the high-energy electrons in the XLPE. A high-energy electron buffering mechanism was also proposed to explain the effect of voltage stabilizer on the electrical treeing and partial discharge activity in the XLPE at high temperatures.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 32
·e52749
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IF 3.057
Qin Yao,Shuifeng Liu,Weihan Zheng,Manting Chen,Shuzhen Zhou,Minjian Liao,Wenhua Huang,Yang Hu,Wuyi Zhou
The biodegradable and bioactive bioscaffolds with suitable hierarchical structure, customized shape, and mechanical performance have great potential for biomedical applications especially in tissue engineering field. However, controllable and facile preparation of the related porous scaffolds remains obvious challenge. In this study, poly(ε-caprolactone) (PCL)-embedded hydroxyapatite (HAP) nanoparticles/collagen hierarchical scaffolds are facilely prepared basing on 3D printing of the pre-crosslinked oil in water type Pickering high internal phase emulsion (HIPE) hydrogel. To be specific, in the HAP nanoparticle stabilized Pickering HIPEs, the aqueous phase contains collagen and genipin, and the oil phase is dichloromethane solution of PCL. After the pre-crosslinking of aqueous phase, the prepared Pickering HIPE turns into emulsion hydrogel with high viscosity and shear thinning characteristics, which can be individually printed and then freeze dried to produce hierarchical scaffolds with the designed structures. The related multiscale pore structures are composed of mm-scale macropores and μm-scale micropores, and the related porosity is higher than 84%. Increasing PCL content obviously enhances the compression stress of scaffolds, particularly the compressive stress of porous scaffold prepared with PCL content of 14 w/v% is about 9 times as large as that of porous scaffold without PCL. The results of in vitro mineralization and cell culture assay show that the porous scaffolds have favorable apatite formation ability and biocompatibility. Thus, the prepared hierarchical scaffolds with the designed structures, customized shape and adjustable performance are promising potential applications in bone tissue engineering.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 42
·e53033
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IF 3.057
Jiaoyang Li,Zhaoqing Lu,Jizhen Huang,Li Hua
Designing aramid nanofiber (ANF) aerogel with excellent microstructure and high thermal insulation property is benefit for applications in integrated thermal management system. To obtain a structurally controllable ANF-based aerogel, the cellulose nanofiber (CNF) and poly (vinyl alcohol) (PVA) were ‘stiff–soft’ synergistic to improve the microstructure. The cobweb like structures distributed in the honeycomb layered pores of the CNF/PVA/ANF composite aerogel which was conducive to the performance and application of composite aerogel. The resulting CNF1/PVA1/ANF composite aerogels are highly porous (99.12%) and tiny volume shrinkage (4.65%), leading to excellent thermal insulation performance (26.83 mW/m·K). The ‘stiff–soft’ feature endows the composite aerogels high flexibility as well as large compression strength. These favorable multi-features make the CNF/PVA/ANF composite aerogels ideal advanced material for aerospace, industrial, and commercial applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52901
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IF 3.057
Yu-Fan Hu,Xue-Jun Zhou,Shi-Hao Ni,Feng-Yang Wu,Ji-You Zong,Tai-Bao Yang,Ding-Xiang Yan,Jian-Hua Tang,Jun Lei,Zhong-Ming Li
Thermal interface material (TIM) is crucial for electronic devices to dissipate heat, but the high interface thermal resistance between polymer matrix and filler is a major problem affecting its thermal conductivity (TC). In this study, we prebuilt excellent thermally conductive pathway of isotropic spherical boron nitride (sBN) using a facile method, that is, pressing fillers, to decrease the interface thermal resistance before filling matrix silicon rubber (SR), and prepared a TIM with high isotropic TC. At 50 wt% filler content, the through-plane and in-plane TCs of sBN/SR composite reached 9.36 and 7.82 W/(m·K), respectively, which are higher than the highest value of previous research on bulk BN/SR composites (not including film), 4.13 and 6.56 W/(m·K), respectively. Meanwhile, the thermal decomposition temperature of TIM is 47.2°C higher than that of pure SR. In addition, the TIM has a low hardness (shore A hardness <70) and can be bent and folded, so can be used to substitute traditional thermally conductive silicone pad.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 39
·e52943
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IF 3.057
Congyang Ma,Sheng Wang,Yage Li,Tianjia Yu,Youwei Yao,Hongda Du,Qiang Cai
Generally, foamed epoxy resin prepared by chemical method has relatively large average cell size and low cell density, resulting in low mechanical properties and poor heat resistance. In this work, a new type of composite foaming agent (CFA) was prepared by filling the chemical foaming agent 4,4′-bisoxybenzenesulfonyl hydrazide (OBSH) into microporous silica microspheres (MSMs), and then used for epoxy resin foaming research. The effects of curing agent diethylenetriamine (DETA) and CFA contents on cell density and size were also discussed. The best epoxy resin foaming sample has a cell density of 10 6 cells cm −3 with an average cell diameter of 65 μm, and a high compressive strength of 34 MPa as well as a good heat resistance. These results indicate the potential application of CFA in epoxy resin foaming area.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 43
·e53054
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IF 3.057
Ming Yan,Ting Wu,Jinxia Ma,Hailong Lu,Xiaofan Zhou
Wheat straw (WS) was considered the most abundant agricultural residue in China. Therefore, it was meaningful to explore the effective utilization of WS. Thus far, WS has been considered a potential raw material to produce lignocellulose nanofibrils (LCNFs) with the rapid development of nanotechnology. Unfortunately, the existing methods of LCNFs preparation directly from WS still faced some hurdles. Herein, screw extrusion and ball milling considered the common mechanical pretreatments were employed to directly prepare LCNFs from WS. The different impacts of screw extrusion and ball milling pretreatments on the properties of LCNFs were revealed by systematically comparing physicochemical analyses. The results showed that the crystalline and chemical structure of samples was little affected by the mechanical pretreatment. However, the mechanical pretreatment caused a change in the morphology, yield, and chemical composition of LCNFs. LCNFs prepared by screw extrusion with a high yield of 73% had the narrowest diameter distribution (0 ~ 80 nm), the most cellulose content (51.1%), and the maximum crystallinity degree (44.7%). LCNF samples all exhibited good thermal stability. This work could not only offer theoretical guidance on the preparation of LCNFs by mechanical pretreatments but also expand the high-value application of WS in polymer composites.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 41
·e52992
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IF 3.057
Yujia Hao,Guangming Zhu,Ben Li,Tianning Ren
High-performance polyurea materials demonstrate promising applications in the field of aerospace, military, etc. During processing and use, however, the formation of cracks may cause serious degradation of material properties. Self-healing polyurea should be an effective way to address this issue. Here, an innovative polyurea material, which exhibited excellent mechanical properties and self-healing abilities, was synthesized from the commercially available poly(propylene glycol) bis(2-aminopropyl ether), isophorone diisocyanate, and 2-Aminophenyl disulfide (APD). The rigid benzene ring in APD is beneficial to the mechanical properties of polyureas, simultaneously the irregular structure of APD prevents the hard segments from stacking tightly, which facilitates the exchange of disulfide bonds to achieve the self-healing function. Furthermore, the microstructure, mechanical properties and self-healing ability of the polyureas are highly dependent on the amount of APD. The obtained SPU-4 exhibits robust mechanical strength (tensile stress of 21.2 MPa), outstanding stretchability (strain of 1006%), high rigidity (Young's modulus of 248.1 MPa), and excellent energy absorption (toughness of 139.7 MJ·m −3 ), besides, with heat stimulation, the self-healing efficiencies based on strength and elongation could reach 92.7% and 74.5%, respectively. The excellent properties allow the material to show broad potential in the practical applications such as protection, energy absorption, etc.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 37
·e52882
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IF 3.057
Shuaishuai Cheng,Xiaoyuan Duan,Yiwen Cui,Chaobo Liang,Zhiyi Zhang,Guizhe Zhao,Yaqing Liu
The development of high-performance green rubber materials with excellent comprehensive properties is very important for the environment and resources. Graphene has excellent electrical, mechanical, and thermal properties and is regarded as the most promising functional filler for rubber composites. In this work, a facile and efficient strategy was used to prepare graphene rubber materials with balanced integrated properties by chemical modification of graphene oxide (GO) with gelatin (Gel). Gel molecules as bridges could not only connect with GO by chemical bonds, but also physically entangle with natural rubber (NR) molecules. The optimized dispersibility of GO and the enhanced interfacial interaction between GO and NR together enable graphene rubber to exhibit excellent integrated properties, such as tensile strength of 29.7 MPa and heat build-up of 1.9°C only at 1 phr of Gel-rGO (G-rGO) content. Additionally, finite element simulation was used to evaluate the temperature field distribution of graphene rubber tires, and the temperature of the NR/Gel-rGO (NR/G-rGO) tread was 17.3°C lower than that of NR/GO. This work will provide effective strategies for the preparation of high-performance graphene rubber materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 37
·e52878
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IF 3.057
Jianhua Wu,Meng Li,Ying Cao,Jianmin He,Mingjin Xue,Aoqi Zhu,Yongyi Huang,Yiting Xu,Birong Zeng,Lizong Dai
Polyurethane is a promising topcoat in anticorrosive coating system. As a topcoat, the study on improving its weathering resistance is significative. In this work, we present an anticorrosive filler, named GOFA based on p-fluoroaniline chemical modified graphene oxide, and explored the potential of GOFA to improve the weatherability and corrosion resistance of polyurethane coatings. The results of the comprehensive experimental studies showed that the addition of 0.5 wt.% GOFA leaded to an improvement in the hydrophobicity of the polyurethane coating and the composite coating exhibits an excellent shielding effect against corrosive media. At the same time, the ultraviolet aging resistance the GOFA modified polyurethane composite coating also showed satisfactory results. It is inspired that adding a small amount of GOFA can make the composite polyurethane coating have excellent anti-corrosion performance and weather resistance.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52685
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IF 3.057
Fei Yu,Hengyu Feng,Jinpeng Leng,Hongying Xue,Ziyi Zhong,Zhen Yan,Xudong Liu,Yu Liu,Linghan Xiao
In regard to the nonfatal harm self-healing of natural species, microcapsule-based polymeric materials for self-healing have been considered to be highly desirable in light of their ability to heal cracks in significant volumes, leaving the original chemical structures of polymers unchanged. Accordingly, this study sought to design a one-component photo-responsive self-healing polymer composite based on Bisphenol A epoxy acrylate resin @graphene oxide microcapsules (BAEA@GOMCs) that are capable of photo-absorption in order to reduce difficulties of processing and inhomogeneous distributions of the two components. Embedding of BAEA@GOMCs were carried out in waterborne epoxy matrix, and self-healing composite coatings were generated onto surfaces of hot-dip steel via galvanization. Upon incurring mechanical damage, solidification of the agents of photo-responsive healing and the flowing the cracks were achieved as the agents were exposed to light to achieve self-healing. In addition, the solidification within the unbroken microcapsules was maintained, and there were continuous no reactions. Given the simplicity of the proposed preparation, incorporating light-absorbing particles into the microcapsule shell can further broaden the application range of the aforementioned common materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52718
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IF 3.057
Zhihang Ma,Xiao Wang,Junru Li,Xinlin Li,Chuanwei Zhang,Ruyi Zhang,Yan Gu,Pengfei Zhang
The reaction process and curing mechanism of self-healable epoxy resin TGDDM and curing agent TA are complicated. In this paper, the curing reaction kinetic mechanism of the system is studied from the perspective of isoconversional models. The n th-order model and autocatalysis model are established for observations of heat flow versus temperature and time during real-time curing obtained by non-isothermal differential scanning calorimetry (DSC), and evaluated under the standards of MSE, RMSE, and R -square. Under the guidance of least squares fitting, the pre-exponential factor ( A ), the activation energy ( E α ), the order of models ( n, m ) and other parameters in f α of the model are mainly estimated by Kissinger method, Ozawa method, Malek method, and other methods. The correlation between the activation energy ( E α ) of the reaction and the degree of conversion α also analyzed by the Flynn-Wall-Ozawa method. The chemical reaction of the system is studied by Fourier transform infrared (FTIR) and the self-healing property of the system is characterized by scanning electron microscope (SEM). It was found that the esterification reaction occurred in the system, and the realization of the self-healing property was also due to the transesterification reaction. In addition, the effect of the accelerator on the system is analyzed by the established autocatalysis model and dynamic mechanical analysis (DMA). The result shows that the addition of the accelerator does not change the curing reaction mechanism of the system, but accelerated the reaction process and increased the glass transition temperature.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52709
·
IF 3.057
Lianzhou Yang,Kaili Shen,Jun Xu,Mannian Ren,Fahai Cao
Stable oil-soluble metals complexes in crude oil bring various problems to the oil processing. In the previous work, four spherical polymer brushes with SiO 2 as a core showed high nickel and calcium removal efficiency, but SiO 2 has high density and smaller specific surface area, greatly limiting the demetallization efficiency. In the present work, spherical polyelectrolyte brushes (PAA@PB) were synthesized by emulsion grafting polymerization. DLS and TEM show that PAA@PB exhibits a uniform spherical core-shell structure with a diameter of 526.3 nm, and TGA exhibits that the grafting rate is 20.6%. The demetallization rate and selectivity of PAA@PB were investigated with varying concentration, electrical desalination conditions, pH value, and NaCl concentration. In contrast, the demetallization efficiency of PAA@PB is much greater than that of PAA@SiO 2 -G. Notably, PAA@PB exhibits excellent nickel removal efficiency, but a little more selective for iron. The optimal removal rate for calcium, nickel, and iron are 55.3%, 52.6%, and 46.1%, respectively. Compared with P4VP@SiO 2 -G, which possesses the highest demetallization efficiency among four polymer brushes with SiO 2 , to achieve the same nickel removal rate, the concentration of PAA@PB is almost eight times less than that of P4VP@SiO 2 -G. Consequently, PAA@PB has great potential as an excellent comprehensive demetallization agent.
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高影响因子
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