四针状氧化锌晶须填充改性聚丙烯研究

以乙烯-辛烯共聚物接枝甲基丙烯酸缩水甘油酯(POE-g-GMA)为增容剂,利用熔融共混法制备了聚丙烯(PP)/POE-g-GMA/四针状氧化锌晶须(T-ZnOw)复合材料,借助于SEM、DSC和其他测试手段对复合材料的结构和性能进行了考查。DSC测试结果表明:T-ZnOw对PP基体的结晶有一定的诱导作用,使体系出现了双熔融峰和双结晶峰,但对PP的结晶能力和结晶度影响不大。力学性能测试结果表明:在POE-g-GMA的协同作用下,T-ZnOw对PP基体有较强的增韧作用,但增强作用不明显。     

四针状氧化锌晶须的表面改性

分别用硅烷偶联剂KH550、KH560和KH570对四针状氧化锌晶须进行表面改性研究,考察偶联剂的用量、处理方法等对改性效果的影响.结果表明:湿法改性效果优于干法,KH570的改性效果好于其它两种偶联剂.通过扫描电镜和力学性能测试对经KH570处理过的氧化锌晶须与聚丙烯制成复合材料的界面作用效果进行考查.结果显示:处理后的四针状氧化锌晶须与聚丙烯基体界面作用良好,所制备的复合材料力学性能优于未经处理的四针状氧化锌晶须所制备的材料.     

四针状氧化锌晶须的制备

用锌粉氧化的方法,通过控制反应器内的气相过饱和度,可以获得不同尺度的四针状氧化锌晶须（T－ZnOW)。合成出的ZnO的晶须纯度高,晶体结构完整,晶须尺度可控（针长为10-60μm,根部尺寸约为1-6μm）。晶须的生长机理为气－固（VS）机理。     

四针状氧化锌晶须对聚丙烯力学性能及抗菌性能的影响

采用偶联剂KH-570对四针状氧化锌晶须(T-ZnOw)进行表面改性,制备了聚丙烯(PP)/改性T-ZnOw复合材料。对复合材料进行了X射线衍射分析,并考察了T-ZnOw含量对复合材料力学性能和抗菌性能的影响。结果表明:T-ZnOw在PP基体中结晶良好;适量添加经过表面改性的T-ZnOw能提高复合材料的拉伸强度、断裂伸长率和弯曲强度;在T-ZnOw含量为4%时,复合材料即可达到国家规定的抗菌要求。     

改性氧化锌晶须对丁腈橡胶性能的影响

分别采用偶联剂(Si—69,NDZ—201,KH—550)对氧化锌晶须进行表面改性,研究了改性氧化锌晶须对丁腈橡胶性能的影响。结果表明:Si—69改性氧化锌晶须补强的NBR橡胶物理机械性能、耐老化性能、耐液体性能等优异,效果较KH—550和NDZ—201的好,用量为4份时硫化胶综合性能较好。     

ZnO晶须用作泡沫硅橡胶增强体应用研究

本文叙述了ＺｎＯ晶须在泡沫硅橡胶研制过程中作为增强剂，并在实验基础上研究了ＺｎＯ晶须的添加量，表面预处理和蔼对其补强效果的影响，初步搪塞了其微观补强机理。     

表面处理作用对聚丙烯/四针状氧化锌晶须复合材料性能的影响

以聚丙烯为基体树脂,四针状氧化锌晶须为主要填充剂,制备具有抗静电性能的复合材料,本文将重点研究偶联剂的种类和用量对PP/T-ZnOw(100/10)复合体系性能的影响。力学性能研究表明,采用用量为1%的硅烷偶联剂JH-0174处理氧化锌晶须时,PP/T-ZnOw复合材料的力学性能达到最佳值;同时,阻率均有所下降且较大,PP电性能得到较大改善。微观结构分析表明,经偶联剂处理的复合材料中氧化锌晶须分布均匀且界面结合作用强。     

四脚状氧化锌晶须及应用

四脚状氧化锌(T-ZnO)晶须是晶须家族中目前发现的唯一具有规整三维结构的四脚状晶须.本文简述了T-ZnO晶须的发展、结构和特性、制备方法和生长.以及作为高分子基复合材料的增强体的应用.     

抗静电氧化锌晶须对热硫化硅橡胶性能的影响

研究了抗静电用氧化锌晶须对热硫化硅橡胶的硫化特性、力学性能及电性能的影响。结果表明：在硅橡胶硫化初期氧化锌晶须能加速硫化反应、在硫化后期延迟硫化反应，可提高其最低扭矩和最高扭矩；硫化胶的硬度增加，拉伸强度、扯断伸长率有所降低，表面电阻率和体积电阻率降低。     

氧化锌晶须渗入聚丙烯腈纤维的抗静电性能

在乳液中悬浮的氧化锌晶须渗入聚丙烯腈纤维中,起到抗静电作用,聚丙烯腈纤维的体积比电阻率可降到4.1×108Ω.cm;四针状和单针状的氧化锌晶须的渗入能力不同,得到抗静电性能不同;渗入工艺简单方便,同时解决了氧化锌晶须添加入聚丙烯腈纺丝原液所造成的喷丝孔阻塞问题。     

高阻尼硅橡胶的制备

以低苯基硅橡胶、气相法白炭黑、自制阻尼剂为原料,制备了高阻尼硅橡胶,并测试了高阻尼硅橡胶的阻尼系数、损耗模量和储能模量.结果表明,将阻尼剂DA-1和DA-2并用制备的高阻尼硅橡胶与日本生产的阻尼硅橡胶相比,阻尼峰向高温方向移动了约34 ℃,峰值更高,阻尼峰加宽,在20～150 ℃的范围内阻尼性能优异,适合大应力、大应变而生热高的苛刻环境中使用.添加阻尼剂DA-3制备的阻尼硅橡胶在0～70 ℃范围内阻尼性能优异.     

高阻尼硅橡胶的研制

以不同阻尼剂分别对硅橡胶主链和填料表面进行改性的途径制备了阻尼硅橡胶,分别通过DMTA和应力应变法对制备的阻尼硅橡胶进行了研究,结果表明：采用阻尼剂DA-1/DA-3=15/5并用的配方,硅橡胶的阻尼性能最优,综合性能最好。硅橡胶的蠕变性能随着阻尼剂DA-1比例的增加而改善。     

影响阻尼硅橡胶性能的因素

以阻尼剂制备了阻尼硅橡胶,研究了阻尼剂的量、水解条件和生胶的苯基含量对阻尼硅橡胶性能的影响,结果表明:阻尼剂的量在一定范围内(不超过20份),随着量的增加,阻尼硅橡胶的性能不断提高;混炼胶以210℃×4 h水解处理得到的阻尼硅橡胶综合性能为好;低苯基生胶(LPVMQ)比甲基乙烯基生胶(VMQ)制备的阻尼硅橡胶阻尼系数显著提高,但中苯基生胶(MPVMQ)比LPVMQ制备的阻尼硅橡胶阻尼系数提高较小。     

Study on the high-temperature damping properties of silicone rubber modified by boron-terminated polysiloxane

Rubber damping materials have important applications in modern industrial systems. However, their damping temperature range is low, which is not suitable for the damping demand under high temperature conditions. At present, there is very little research on the damping performance of rubber under high temperature conditions. Silicone rubber has excellent high temperature resistance but poor damping in its application temperature range. In this study, a boron-terminated polysiloxane (PBS) was prepared by modifying hydroxy-terminated polydimethylsiloxane (PDMS-OH) with boric acid (BA). The molecular structure of PBS was confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) analysis. Rheology measurements revealed that PBS was a “shear hardening” material. Then, the silicone rubber was modified with PBS. With the introduction of boron atoms, boron and oxygen dative bonds with dynamic properties could be formed inside the silicone rubber, which played an energy dissipation role in the process of association/dissociation. Dynamic mechanical analysis (DMA) showed that the loss factor (tan δ) of modified silicone rubber was greater than 0.3 in the temperature range of 81.5°C–250°C, which was higher than the loss temperature range of conventional damping rubber. The cyclic stress–strain test also showed that the modified silicone rubber still had high dissipation coefficient (DE) at high temperature. Therefore, the PBS-modified silicone rubber prepared by this method achieved excellent damping performance under high temperature conditions.     

Interfacial reaction of stannic oxide in silicone rubber at 300°C

The thermal stability of high-temperature vulcanized silicone rubber with stannic oxide as a heat stabilizer was investigated by heat aging at 300°C × 24 h in air. It was discovered that Sn⁺⁴ is reduced to Sn⁰ during vulcanization and during heat aging in air by X-ray photoelectron spectroscopy (XPS). © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2779–2781, 1999     

Fractal analysis of worn surfaces of ZnO whisker/natural rubber‐styrene butadiene rubber‐butyl rubber composites

The wear resistance of zinc oxide whisker (ZnOw)/natural rubber‐styrene butadiene rubber‐butyl rubber (NR‐SBR‐BR) composites showed that a tetra‐needle like ZnOw, which is treated by a coupling agent, improved the wear resistance of the rubber composites. The topography of the worn surfaces of the ZnOw/NR‐SBR‐BR composites was fractal, and the fractal dimension and abrasion loss decreased synchronously as the ZnOw content increased in the composites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 667–670, 2003     

减振用高性能阻尼硅橡胶的制备和应用

该文以橡胶减振性能为出发点,通过阴离子开环共聚的方法,成功地将苯基侧链引入聚硅氧烷结构中,制成了一种减振用高阻尼硅橡胶。通过对比苯基硅橡胶、甲基乙烯基硅橡胶、氯化丁基橡胶等三种橡胶的阻尼性能和减振性能,进一步研究了橡胶的阻尼性能与减振效果的关系。实验结果表明,所制备的阻尼硅橡胶在较宽温度内具有良好的阻尼性能,是一种性能优良的减振用阻尼材料。     

Radiation synthesis of polysilane-modified graphene oxide for improving thermal conductivity and mechanical properties of silicone rubber

Functionalized graphene oxide (named GO-Si) was synthesized with graphene oxide and triethoxyvinylsilane (TEVS) using tetrahydrofuran solution by γ-ray irradiation. TEVS was successfully covered onto GO sheets, and the polysilane content on GO-Si was increased upon increasing the absorbed dose. The structures of GO-Si were verified by atomic force microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The resultant GO-Si was dispersed into α,ω-dihydroxypolydimethylsiloxane to prepare room temperature vulcanized silicone rubber composites (named SR/GO-Si) by solution casting. The dispersion of GO-Si was more uniform than that of GO. Compared to that of pure SR, the thermal conductivity of SR/GO-Si-1.95 composites was increased 1.5-fold, and its tensile strength and elongation at break increased 78.6 and 71.4%, respectively. It was expected that SR/GO-Si would have potential application as the thermal interface material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47776.