JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 32
·45111
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IF 1.86
Yangcheng Lu,Xiaojing Liu,Guangsheng Luo
Compared with low molecular surfactants, poly(vinyl alcohol) (PVA) could afford latexes with particular tackiness as an important property for various applications. However, until now, except for some highly reactive monomers, most of monomers including styrene seldom use PVA as protective colloid in emulsion polymerization. In this work, we used oil-soluble initiator, 2,2′-azobisisobutyronitrile, to accelerate the copolymerization of styrene and divinyl benzene in PVA protected colloids and synthesize polystyrene (PS) latex within 50 min at 70 °C successfully. The reaction system could remain stable even at the monomer-to-water ratio as high as 1:4, and the polymerization in pseudo-micelles or latex particles was always dominant. The adjustment of the size of the PS latex in the range from 70 to 100 nm was facilely achieved by changing the polymerization temperature, the addition of PVA, or the monomer-to-water ratio. This method was also exploited to synthesize poly(styrene- co -methyl methacrylate) and poly(styrene- co -4-chlorostyrene) latexes, indicating prospects in applications with the advantages of high capacity and broad applicability. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45111.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhexian Wang,Hongkui He,Yunbo Zhai,Zhixiang Xu,Yongxing Chen,Xiangmin Liu
The photoaging processes of microplastics (MPs) under various conditions, including environmental factors and soluble organic matter, have been extensively investigated. However, a notable gap exists in the literature regarding comparative experiments on the photoaging of polyolefin-type MPs, and research on different light sources is particularly scarce. This research involved exposing representative MPs (polystyrene (PS), polyvinyl chloride (PVC), and polyethylene (PE)) to light with different wavelength ranges (200–2000 nm and 320–780 nm). Results indicated that PS and PVC , with benzene rings and C-Cl chains, exhibited higher susceptibility to photoaging compared to PE, leading to changes in physicochemical properties. In 200–2000 nm, including UVC (200–280 nm) and UVB (280–315 nm), a pronounced PS and PVC photoaging process was observed due to their higher energy, which resulted in noticeable yellowing of the morphology. PE showed less pronounced effects, except for noticeable aging in the 320–780 nm range within 6 h (UV–vis spectrum), with a slow depolymerization rate over 72 h. Furthermore, a limited aging of polyolefins was observed under dark conditions. In summary, this study provides crucial insight into the accelerated photoaging of polyolefin-type MPs under different light source, which offers novel perspectives and references for future research directions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 29
·47784
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IF 2.188
Jing Sun,Caihong Wang,Yanzi Wang,Shuxin Ji,Wenfang Liu
Carbonic anhydrase (CA) catalyzing CO 2 hydration has an important application in carbon capture, and its immobilization is very significant. Here, CA was covalently linked by glutaraldehyde (GA) to the surface of poly(vinylidene fluoride) (PVDF) and polyethylene (PE) membranes, which were previously modified via a simple codeposition of polyethyleneimine (PEI) and dopamine (DA). The effects of the modification conditions were investigated, and the membranes were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The immobilization process was optimized, and the catalytic properties of immobilized CA were studied. The results show that the optimal mass ratio of PEI and DA was 1:1 and the deposition time was 10–12 h, at which the surface amino group density could reach 1.278 × 10 −7 and 1.397 × 10 −7 mol/cm 2 for PVDF and PE, respectively. For enzyme immobilization, the optimal CA and GA concentrations were 0.2 mg/mL and 0.1 wt %, and a maximum activity recovery of about 53% and 76% could be achieved for PVDF-attached CA and PE-attached CA, respectively. Their K m values were 10.62 m M and 8.6 m M , and the corresponding K cat / K m values were 132.2 M −1 s −1 and 312.9 M −1 s −1 . After immobilization, the storage stability and reusability of CA were much improved. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47784.
研究领域:
生物化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115325
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IF 1.449
Yujiu Zhou,Qingxia Liu,Fujia Chen,Yuetao Zhao,Wenyao Yang,Xin He,Xiling Mao,Yajie Yang,Jianhua Xu
Polymer dielectric materials are highly desirable in electronic devices. However, neither low nor high dielectric constant polymers could meet the requirement of high energy storage application due to the contradiction between dielectric constant and breakdown strength. Herein, in order to obtain high performance polymer dielectrics, poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) is filled, as a functional material, into polyurea (PUA) matrix to form all-organic composites. Fortunately, PUA/P(VDF-TrFE-CFE) composites exhibit excellent performance with high dielectric constant and maintain high breakdown strength, resulting in enhanced energy storage density. The breakdown strength of composite film increases to 5130 kV cm−1, and the energy storage density can reach 4.3 J cm−3, which is much higher than pure PUA (2.4 J cm−3) and commercially biaxially oriented polypropylene (BOPP, 1.2 J cm−3). The enhancement of energy density of composite films is mainly attributed to the dipole interaction between PUA and P(VDF-TrFE-CFE) chains, which leads to increases of dielectric constant and maintain high breakdown strength simultaneously. This work provides an effective route to improve the energy density of linear dielectrics and showing great application potential for energy storage.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 16
·14161-14169
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IF 2.324
Xiong Xiaoying,Zhou Zhou,Zhang Zhao,Yang Hui,Zhang Qilong
In this study, rod-like TiO 2 filler was synthesized one-step hydrothermal method and was incorporated into P(VDF-TrFE-CFE) polymer matrix to obtain composites with high dielectric constant. It is found that the morphology and content of TiO 2 fillers play a vital role in tailoring the performance of the as-fabricated composites. The rod-like TiO 2 assembled by numerous nanoparticles maintained its primary shape and homogenously distributed in the matrix, thus achieved sophisticated interface and strong interfacial adhesion with P(VDF-TrFE-CFE) polymer, which together contributed to a dramatic improvement in permittivity of composites. Typically, the dielectric constant of composite with 10 vol% rod-like TiO 2 reaches 160 at 100 Hz, in contrast to 102.5 for the composite with 10 vol% commercial TiO 2 and 47 for pristine P(VDF-TrFE-CFE). This study provides a solution for obtaining high-k dielectric composites with low dielectric loss, which is highly desired for advanced electronic devices.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 9
·3289
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IF 3.4
Yuhao Ma,Tao Zhou,Hao Song,Hong Zhang
As the market for polyethylene consumption continues to expand, the amount of waste polyethylene is also increasing. Modifying asphalt with waste polyethylene (PE) is economical and environmentally friendly. The low-temperature performance and storage stability of PE-modified asphalt has long been an insurmountable problem. The high vinyl acetate (VA) content of ethylene–vinyl acetate (EVA) and PE blended into asphalt can improve the compatibility of PE and asphalt. It compensates for the high VA content of EVA brought about by the lack of high-temperature resistance to permanent deformation but is still not conducive to the stable storage of PE at high temperatures. The effect of furfural extraction oil, a crosslinking (DCP) agent, a silicone coupling agent (KH-570), and calcium carbonate (CaCO3) on the rheological properties and compatibility of PE/EVA-modified asphalt was investigated in this study. The conventional physical properties of PE/EVA-modified asphalt were tested after introducing furfural extraction oil, DCP, KH570, and CaCO3to determine the correlations of these materials. In addition, frequency sweep, multiple stress creep and recovery (MSCR), and linear amplitude sweep (LAS) were utilized to characterize the rheological properties and fatigue behavior. The results reveal that the addition of suitable ratios of furfural extract oil, DCP, KH-570, and CaCO3to PE/EVA-modified asphalt produces a remarkable improvement in the viscoelastic characteristics and viscosity compared with PE/EVA-modified asphalt. Furthermore, fluorescence microscopy (FM) was utilized to evaluate the modification mechanism, which shows that PE/EVA undergoes significant crosslinking in asphalt, forming a three-dimensional network structure that dissolves in the asphalt. The storage stability of the PE-modified bitumen was fully determined, and its high-temperature rheology was substantially improved.Keywords:PE;EVA;DCP;KH-570;rheological analysis;storage stability
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Yucheng Zi,Dong Chen,Guochen Wang,Yuhong Ma,Wantai Yang
A simple strategy is proposed to offer styrene (St) copolymer with intrinsic and catalyst-free upcycling capability by incorporating α -methylstyrene (AMS) units into the copolymer poly(AMS -co- St) (PAS). Compared to polystyrene (PS), the PAS is more susceptible to depolymerizing into St and AMS monomers with higher yields at relatively lower temperature. The yield of liquid chemicals of PAS-4 (26.1 mol% AMS) is up to 93 wt% at 380°C, whereas that PS as control is 78 wt%. The reclaimed liquid chemicals of PAS-4 contain 58.4 wt% St and 37.7 wt% AMS, while the chemicals of PS contain 81.8 wt% St and 4.1 wt% AMS. The introduction of AMS units in PAS leads to a reduction in the liquid chemicals other than St and AMS monomers. The blends of PS and PAMS do not demonstrate the synergistic effect regarding facilitating the PS depolymerization. In addition, the properties of the new PASs prepared with the reclaimed monomers are comparable with those of the virgin PASs. This work proves the concept that recycling efficiency could be boosted by incorporating liable structural units into the copolymer chains and demonstrates a closed-loop of PS up-cycling.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 8
·49872
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IF 2.52
Wanjie Luo,Lulu Wang,Ruijiang Feng,Chongfeng Zhao,Jilin Wang,Tianzhou Cai
A series of composite anion exchange membranes was synthesized via in-situ copolymerization of various ratios N-vinyl formamide (NVF) and divinylbenzene (DVB), supported by porous polytetrafluoroethylene (PTFE) polymer matrix, and followed by alkaline hydrolysis, and quaternization of the composite membranes with epoxypropyltrimethylammonium chloride (EPTMAC). FTIR and SEM analyses revealed that the composite membranes were successfully prepared. Moreover, the hydrophilic property of the composite membrane improved by introduction of the quaternized poly(NVF-co-DVB) copolymer. Water uptake, swelling ratio, and conductivity showed upward trends by increase of NVF amount. The copolymer with 95% of NVF showed the highest elongation at break (102%, room temperature) and conductivity (5.15 × 10 −2 S/cm, 80°C). After immersion of the PNDB 95% -N membrane in 5 mol/L NaOH solution for 96 h at room temperature, the conductivity (60°C) of the membrane decreased to 3.99 × 10 −2 S/cm. Moreover, the membrane registered weight loss under 4.5%, caused by degradation of the quaternary ammonium groups in NaOH solution. All in all, in 3 mol/L methanol solutions, the composite membranes showed permeability ranging from 7.6% to 19.7%, if compared to the Nafion®-115 membrane, showing good alcohol resistance.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 1
·49633
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IF 2.52
Xiaoyan Li,Hui Yu,Xiong Kang,Gang Chen,Ming Zhu,Jianjun Xu
In this paper, the effects of injection molding on structure and properties of poly(styrene-ethylene-butylene-styrene) (SEBS) and its nanocomposite with a functionalized montmorillonite (FMMT) were illustrated by comparison with the results of hot pressing. The injection-molded SEBS and its FMMT nanocomposite have a skin-core morphology with FMMT platelets more preferentially aligned along the sample plane, while hot-pressed samples not. The injection-molded samples also have a dense structure, and a less extent of microphase separation. In the injection molding process, the high shear flow coupled with solidification in presence of temperature gradient and high pressure in the closed cavity greatly affect the morphology and structure of the SEBS and its nanocomposites. The results also indicate attractive interaction between the soft segments of SEBS and the long alkyl silane chain grafted to FMMT, which allows FMMT to form a macroscopic network structure after the high-speed and high-pressure injection molding. The SEBS/FMMT-injected nanocomposite have the highest tensile strength and the best corrosion resistance, which can be attributed to the dense skin-core structure, stronger SEBS/FMMT interaction and the preferentially aligned FMMT platelets.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2023
·
IF 5
Qiujuan Zeng,Lun Zhang,Jihai Zhang,Aimin Zhang
Polymer materials based on highly thermal conductive fillers have emerged as an effective way to achieve wearable thermal management such as personal cooling, thermal management of wearable devices, and so on. Highly thermal conductive fillers, such as boron nitride nanosheets (BNNSs), integrated with fibrous materials are a promising way to construct highly thermal conductive polymer materials. However, many fabrication processes are complex and time consuming. Also, a large amount of BNNSs was loaded into the resultant materials to enhance thermal conductivity. Here, we first prepared hydrophobics sulfonated poly(styrene-ethylene/butylene-styrene) (S-SEBS)/BNNS nanofiber membranes with high thermal conductivity and air permeability for efficient thermal management via facile one-step electrospinning. This strategy made BNNSs uniformly disperse along the nanofibers. Meanwhile, the porous structure remained, enhancing thermal conductivity without sacrificing air permeability. Therefore, the resultant air-permeable textiles demonstrated outstanding thermal management performance with ultrahigh in-plane thermal conductivity of 16.37 W·m–1·K–1 and out-plane thermal conductivity of 0.1037 W·m–1·K–1 at BNNS loading of 15 wt % as well as a hydrophobic surface which could resist stain adhesion, indicating promising utility for wearable thermal management applications.
研究领域:
材料科学
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纺织工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Qilong Zhang,Zhicai Zhu,Da Shen,Hui Yang
This paper reports a feasible method to prepare pure organic polymeric nanocomposites with enhanced dielectric and hydrophobic performance. Homogeneous polystyrene (PS) microspheres with an average diameter of about 250 nm was firstly synthesized through emulsion polymerization. The blend film containing PS, PDMS and P(VDF-TrFE) are prepared by a simple solution-blending and spin-coating method. The blend film exhibits enhanced dielectric and hydrophobic properties. Typically, the dielectric constant of the blend film with 23 wt% PS reaches 21 at 100 Hz, which is 3 times that of PDMS/P(VDF-TrFE) (mass ratio: 2/3) due to enhanced interfacial polarization caused by PS addition. Meanwhile, the blend film with 23 wt% PS possesses a large apparent contact angle of 125° because the presence of a rough surface makes the solid-liquid contact surface larger than the apparently observed area, thus enhancing hydrophobicity. All the improved performances show great potential application for electrowetting devices.
研究领域:
材料科学
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电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2017
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IF 2.429
Dongri WANG,Yongqing ZHAO,Shiyong YU
A series of cerium sulfides were successfully prepared using commercially available nanoscale CeO 2 as precursor, anhydrous Na 2 CO 3 as dopants, CS 2 as sulfur source, under 600–800 °C, respectively. Properties of samples were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometry. The results showed that corresponding γ-Ce 2 S 3 with small size was obtained by using nanoscale CeO 2 as precursor; pure phase γ-Ce 2 S 3 could be obtained under low temperature of 700 °C. Coloring properties of γ-Ce 2 S 3 obtained under 800 °C were studied by researching γ-Ce 2 S 3 /PE and γ-Ce 2 S 3 /PVC composites, respectively. The results showed that satisfied coloring effects to PE and PVC were obtained by using 0.5 phr and 0.2 phr γ-Ce 2 S 3 , respectively.
研究领域:
材料科学
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化学工程
✓ 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）