FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 11
·1849-1857
·
IF 1.022
Zhang Bin,Han Jian
The poly(vinyl acetate) (PVAc)/zinc oxide (ZnO) microcapsule and PVAc/titanium dioxide (TiO 2 ) microcapsule were synthesized via in-situ emulsion polymerization method. The PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis(TG), transmission electron microscopy (TEM), and UV-visible spectroscopy (UV-vis). Effect of PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule on properties of poly(lactic acid) (PLA) was evaluated by UV-vis, SEM and mechanical properties test. The results showed that the addition of PVAc/ZnO and PVAc/TiO 2 microcapsules as a UV-blocking additive could significantly enhance UV-blocking property of PLA/PVAc/ZnO microcapsule composites and PLA/PVAc/TiO 2 microcapsule composites compared with pure PLA, PLA/ZnO composites and PLA/TiO 2 composites. The mechanical properties of PLA/PVAc/ZnO microcapsule composites were better than those of PLA/ZnO composites due to good dispersability and compatibility of PVAc/ZnO microcapsule in PLA matrix. Also, the mechanical properties of PLA/PVAc/TiO 2 microcapsule composites were better than those of pure PLA and PLA/TiO 2 composites. This study demonstrates the great potentials of the intrinsically UV shield additive PVAc/ZnO and PVAc/TiO 2 microcapsules in the application of high performance matrix resin and composite material.
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
·
2018
·Vol. 135
·期 23
·46351
·
IF 1.901
Li Wen,Liwen Wang,Shuyi Fang,Lei Bao,Dongdong Hu,Yuan Zong,Ling Zhao,Tao Liu
Two newly-designed hydrocarbon surfactants, that is, poly(vinyl acetate)- block -poly(1-vinyl-2-pyrrolidone) (PVAc- b -PVP) and PVP- b -PVAc- b -PVP, were synthesized using reversible addition–fragmentation chain transfer polymerization and used to form CO 2 /water (C/W) emulsions with high internal phase volume and good stability against flocculation and coalescence up to 60 h. Their structures were precisely determined by nuclear magnetic resonance, gel permeation chromatography, thermal gravimetric analysis, and differential scanning calorimetry. Besides low temperature and high CO 2 pressure, the surfactant structures were the key factors affecting the formation and stability of high internal phase C/W emulsions, including the polymerization degrees of CO 2 -philic block (PVAc) and hydrophilic block (PVP), as well as the number of hydrophilic tail. The surface tension of the surfactant aqueous solution and the apparent viscosity of the C/W emulsions were also measured to characterize the surfactants efficiency and effectiveness. The surfactants with double hydrophilic tails showed stronger emulsifying ability than those with single hydrophilic tail. The great enhancement of the emulsions stability was due to decrease of the interface tension as well as increase of the steric hindrance in the water lamellae, preventing a frequent collision of CO 2 droplets and their fast coalescence. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46351.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Liping Rong,Xiaohui Fan,Gang Wang,Huanhuan Li,Dayong Zhang,Danni Luo,Sheng Li,Zhiguo Li
Improving the bond strength of wood emulsion adhesives is an ongoing challenge for the wood-processing industry. In this study, PVAc/PS core-shell emulsion particles are functionalized by forming coordination complexes between natural biomaterial tannic acid (TA) and Fe 3+ . The functionalized emulsion particles are assembled on the surface of the core template SiO 2 to form a “superstructure” through hydrogen bonding between the phenolic hydroxyl groups in the TA and the hydroxyl groups on the surface of SiO 2 , which can enhance the cohesive strength of the emulsion adhesive layer, thereby increasing the peel strength of wood adhesives. The results indicated that the functionalized emulsion particles were most effectively assembled on core template SiO 2 particles when the ratio of TA to Fe 3+ was 1:1 and the encapsulation rate of the assembled SiO 2 particles was 150 %. The glass transition temperatures (Tg1 and Tg2), storage modulus, tensile strength, and hardness of the assembled PVAc/PS emulsion film were measured by DSC, DMA, tensile testing machine, and durometer. These properties increased by 11.6 %, 5.3 %, 14.9 %, 127.6 %, and 46.3 %, respectively, compared to those of the PVAc/PS emulsion film. Further, the shear strength of the assembled PVAc/PS emulsion for bonding wood blocks and the peel strength for bonding thin veneers increased by 33.8 and 35.7 %, respectively, compared to those of the PVAc/PS emulsion. This study confirmed that using a modular assembly to improve PVAc/PS emulsion bonding properties can help formulate high-performance waterborne emulsion adhesives with promising applications in the field of thin-wood veneer bonding. This strategy provides an effective method to design and build environmentally friendly, low-cost, and high-performance water-based emulsion adhesives.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 9
·1754-1762
·
IF 1.113
Zhang Bin,Jiang Yujie,Han Jian
Selective separation is an effective method for the removal of heavy metal ions and waste oil from wastewater. Polyvinylidene fluoride (PVDF) was functionalized with polyvinyl acetate (PVAc) by in-situ polymerization, and novel PVAc-g-PVDF coating on surface modified cotton fabric were prepared. The contact angle (CA), pure water flux (PWF) and self-cleaning ability of coated cotton fabric were investigated in detail. In addition, the separation performance of coated cotton fabric was reflected by the removal of heavy metal ions in simulated wastewater. The results revealed that the PVAc-g-PVDF-coated cotton fabric was free of waste oil adhesion and was self-cleaning from waste oil in aqueous environment. Meanwhile, this coated cotton fabric can effectively separate oil/water mixtures with a high flux and high oil rejection, and was easily recycled for long-term use. More importantly, the heavy metal ions rejection ratio and adsorption capacity of cotton fabric were also improved with the addition of PVAc-g-PVDF coating. PVAc-g-PVDF-coated cotton fabric exhibited excellent rejection stability and reuse performances after several times fouling and washing tests. It can be expected that the present work will provide insight into a scaled-up fabrication process of PVAc-g-PVDF coating for purifying wastewater.
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
FUEL
·
2025
·
IF 7.5
Hou Conghua,Li Jingyu,Jia Xueru,Ma Jingjing,Zhang Haozhe,Luo Yuhang
RDX (Royal Demolition Explosive) is renowned for its exceptional explosive performance, yet it is prone to combustion and explosion when exposed to open flames, high temperatures, vibrations, impacts, and friction. Addressing these challenges is essential for the practical application of RDX. Molecular dynamics simulations were employed to calculate the binding energies of composite particle models with varying ratios of TATB/RDX/PVAc, revealing that the TATB/RDX/PVAc (40/55/5) combination exhibited significantly higher binding energies, indicating optimal system stability. Experimental findings indicated that the optimal processing conditions are a polymerization temperature of 60 °C, a stirring rate of 350 r/min, and an initiator dosage of 1 wt%. Consequently, TATB/RDX/PVAc/GO microspheres with uniform and dense morphology were successfully synthesized. Through the calculation and comparison of thermal decomposition kinetic parameters, it was determined that the thermal explosion critical temperature of RDX in composite particles is elevated by 4.27 °C and 2.97 °C compared to pure RDX, with the T p0 value increased by 5.5 °C and 3.85 °C, respectively. For TATB in composite particles, the thermal explosion critical temperature was raised to 21.51 °C and 17.79 °C, with the T p0 value enhanced by 22.96 °C and 18.56 °C, respectively. Furthermore, the critical impact sensitivity (55 J) is 4.5 times greater than that of refinement RDX (12 J), and the critical friction sensitivity (288 N) is twice that of refinement RDX (144 N). The results demonstrate that TATB/RDX/PVAc/GO energetic composite microspheres, prepared via the Pickering emulsion polymerization method, possess excellent thermal stability and mechanical blunt sensitivity, providing a theoretical foundation for the broad application of RDX.
研究领域:
含能材料
·
高分子化学
·
炸药工程
·
材料科学
·
化学物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yang Hu,Xiaoyan Lin,Datong Liu,Lili Liang,Chunxia Pang,Xunhai Pan
Oil-water emulsion separation could improve the efficiency of oil resources and reduce environmental pollution. The efficiency of oil-water separation was directly affected by the surface hydrophobicity of the membrane and its reliability and reusability. Therefore, the construction of a reliable and reusable super-hydrophobic surface was very important. In this research, the EFM with sandwich structure of PS-SiO 2 -PVAc-SiO 2 was easily fabricated by a three times liquid phase induction process and heat treatment. The PS-SiO 2 -PVAc-SiO 2 EFM was first formed by a triple liquid phase induction process, then the EFM was heat-treated, the PVAc, which is a heat-sensitive material, resulting in SiO 2 nanoparticles being welded onto PS fibers. The rolling contact angle experiment at an inclination of 8° proved that the PS-SiO 2 -PVAc-SiO 2 EFM has super-hydrophobic properties. Meanwhile, the PS-SiO 2 -PVAc-SiO 2 EFM showed excellent stability and reliability of super-hydrophobic properties after the EFM was washed or taped. In addition, the PS-SiO 2 -PVAc-SiO 2 EFM had self-cleaning function and fine oil-water separation property. The oil-water separation efficiency was over 99.50 % and the flow rate was 68 L/m 2 h. After 5 times of oil-water separation, the flux and separation efficiency did not decrease significantly, which proved that the PS-SiO 2 -PVAc-SiO 2 EFM could be reusable.
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
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2020
·
IF 2.671
Xiao Zhang,Long Bai,Jiaxing Sun,Zhiguo Li,Zhao Jia,Jiyou Gu
PVAc-based inverted core/shell (ICS) structured latex adhesive with improved water- and heat-resistance was prepared by a copolymerizing-grafting sequential reaction approach. The sequential reaction process combines the function of a copolymer layer and an active grafting site to controllably achieve the thermodynamic non-equilibrium ICS morphology with hydrophilic poly(vinyl acetate) (PVAc) cores and hydrophobic polystyrene (PS) shells. The difference between the sequential reaction approach and the chemical grafting method was explored. Structured latex particle morphology , transferring from strawberry-like particles, over particles with large and irregular PS protuberances, to nearly spherical particles with a smooth surface, was microscopically visualized by changing the amount of butyl acrylate (BA) in the PVAc copolymer cores. The heat- and water-resistant bonding of PVAc-based adhesives on wood blocks were evaluated by shear strength at both dry and wet conditions, as well as the boiling water failure time. The results showed that a significant improvement of water- and heat-resistance, especially for boiling water resistance, was successfully obtained. This novel approach paves a way for controlled design and manufacture of high-performance emulsion adhesives through tailoring particle morphology.
研究领域:
材料科学
·
化学工程
·
粘合技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 58
·36382-36391
·
IF 3.108
Xiaobin Lu,Hongguo Zhao,Chunhui Feng,Qian Chen,Zhao Zhang,Chunhua Yang,Xianru He,Xin Wang
In order to improve the compatibility of Fe3O4 particles with ethylene vinyl acetate copolymers (EVA) composite hot melt adhesives (HMAs), Fe3O4 magnetic particles were surface coated with polyvinyl acetate (PVAc). The PVAc-coated Fe3O4 modified EVA composite HMAs were characterized by SEM, DSC, XRD, optical contact angle measuring, infrared dichroism and parallel-plate rheometer measurements. The results showed that Fe3O4 particles were successfully coated by PVAc, leading to better dispersion of the particles in EVA composite HMAs. It was also found that the orientation structure, interfacial property and the flow properties of the modified HMAs were all changed, and the segment orientation degree and crystallinity of the modified EVA composite HMAs clearly increased with the increase of PVAc-coated Fe3O4 particles content. Importantly, the peel strength of the modified HMAs was further enhanced. For the modified HMAs with 15 phr (parts per hundred resins) of PVAc-coated Fe3O4 particles, the peel strength reached 6.6 kN m−1 and was increased by 247% compared with the unmodified HMAs.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2013
·
IF 3.365
Xue Jiang,Zhuang Zhuang,Feng Xin
Highly b-oriented Titanium Silicalite-1 (TS-1) zeolite films were synthesized on polyvinyl acetate (PVAc) modified glasses by hydrothermal crystallization. The prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR) and a contact-angle instrument. The results showed that the mass of PVAc on the glasses would influence the process of superficial nucleation and oriented growth of TS-1 films profoundly. A favorable amount of PVAc on smooth surface of glassy substrate was determined to form a highly b-oriented and fully covered TS-1 film by attracting appropriate precursor and template, then making TS-1 nucleate and grow orientedly. Based on the obtained results, a scheme of fabricating b-oriented TS-1 films was proposed.
研究领域:
材料科学
·
无机化学
·
薄膜制备
·
沸石化学
✓ 已验证
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 14
·2028
·
IF 4.7
Chao Du,Yangyang Zhang,Jiangmin Lin,Guotao Fan,Can Zhou,Yan Yu
Polymeric positive temperature coefficient (PTC) materials with low switching temperature points are crucial for numerous electronic devices, which typically function within the room temperature range (0–40 °C). Ideal polymeric PTC materials for flexible electronic thermal control should possess a room-temperature switching temperature, low room-temperature resistivity, exceptional mechanical flexibility, and adaptive thermal control properties. In this study, a novel PTC material with a room-temperature switching temperature and superb mechanical properties has been designed. A blend of a semi-crystalline polymer EVA with a low melting temperature (Tm) and an amorphous polymer (PVAc) with a low glass transition temperature (Tg) was prepared. Low-cost graphite was chosen as the conductive filler, while CNF was incorporated as a hybrid filler to enhance the material’s heating stability. PVAc0.4/EVA0.6/GP-3wt.% CNF exhibited the lowest room temperature resistivity, and its PTC strength (1.1) was comparable to that without CNF addition, with a Curie temperature of 29.4 °C. Room temperature Joule heating tests revealed that PVAc0.4/EVA0.6/GP-3wt.% CNF achieved an equilibrium temperature of approximately 42 °C at 25 V, with a heating power of 3.04 W and a power density of 3.04 W/cm2. The Young’s modulus of PVAc0.4/EVA0.6/GP-3wt.% CNF was 9.24 MPa, and the toughness value was 1.68 MJ/m3, indicating that the elasticity and toughness of the composites were enhanced after mixing the fillers, and the mechanical properties of the composites were improved by blending graphite with CNF.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chinese Journal of Mechanical Engineering
·
2025
·
IF 4.5
Gang Yu,Qianguo Yu,Zhaobang An,Yixuan Zhu,Kedong Bi
The global epidemic of diabetes urgently requires continuous and non-invasive glucose monitoring techniques. This article presents the development of a novel Pt/PANI-modified TiO 2 /PVAc nanofiber electrochemical sensor to address this challenge. In this research, the doping of Pt particles and PANI particles has effectively enhanced the electrochemical performance of the electrode. TiO 2 is first mixed with PVAc powder and then dissolved in an acetone/ethanol solution. Subsequently, fibers are fabricated through electrospinning technology and laid onto the electrode surface. The incorporation of TiO 2 offers more active sites for the deposition of Pt and PANI, thereby strengthening the stability of the overall structure. Furthermore, after the immobilization of Pt and PANI, the designed electrode demonstrates more outstanding performance in glucose detection. Experiments have shown that the peak current of the Pt/PANI/TiO₂/PVAc electrode in the electrochemical detection of glucose is 11 times that of the TiO₂/PVAc electrode. The results indicate that the ultimate electrode exhibits a detection limit of 0.001 mM, with a sensitivity of 7.818 μA·mM⁻¹·cm⁻², and a linear detection range spanning from 50 μM to 7 mM. These characteristics render it suitable for applications involving the detection of physiological glucose concentrations. This work demonstrated a promising step towards practical and effective wearable glucose monitoring, offering a safer and more convenient alternative for diabetes management.
研究领域:
电化学传感器
·
纳米材料
·
可穿戴设备
·
糖尿病技术
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 7
·1296-1303
·
IF 1.113
Zhang Bin,Jiang Yujie,Han Jian
A flexible and stretchable three-dimensional nanocomposite membrane based on traditional cotton fabric is a promising alternative for proton exchange membrane because it has the capability of transferring protons, is inexpensive, and also have higher current density compared to Nafion membranes in microbial fuel cells. The obtained results showed that the highest power and current of PVAc-g-PVDF-coated cotton fabric were 400±10 mW/m 2 and 92 mA/m 2 , respectively. However, maximum generated power and current for Nafion-117 were 300±10 mW/m 2 and 60 mA/m 2 , respectively. The highest proton conductivity of PVAc-g-PVDF-coated cotton fabric was (1.5±0.2)×10 -2 S/cm at 25 °C and lowest glucose permeability was (12±1)×10 -6 cm 2 /s after Mg 2+ ions adsorption. Furthermore, the highest COD removal (85±3 %) and CE (11.2 %) were obtained from PVAc-g-PVDF-coated cotton fabric. The coated cotton fabric can provide a novel route for low-cost production of high-performance flexible proton exchange materials from the natural fabrics.
研究领域:
材料科学
·
环境工程
·
生物技术
✓ 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）