摘要
采用γ-缩水甘油醚氧丙基三甲氧基硅烷(A187)与对氨基二苯胺(PPDA)反应,制备得到一种具有防老化功能的硅烷偶联剂,并通过1H-NMR、IR和MS对其结构进行表征.之后,将不同用量的硅烷偶联剂用于原位改性白炭黑制备防老功能化白炭黑/天然橡胶(NR)复合材料,并与相应的炭黑/NR、未改性白炭黑/NR及双-(γ-三乙氧基硅基丙基)四硫化物(Si69)改性白炭黑/NR在加工性能、增强性能和防老化性能方面进行对比.硫化特性数据表明,防老偶联剂的添加使复合材料的黏度降低,最大转矩增加,正硫化时间缩短.动态黏弹性能显示,改性后白炭黑的分散性得到明显提高.复合材料的力学性能先随防老偶联剂用量的增加而提高,之后到达平台.当防老偶联剂的用量大于或等于白炭黑质量的10.8%时,复合材料的拉伸强度与炭黑/NR、Si69改性白炭黑/NR相当,远大于未改性白炭黑/NR的强度;而其撕裂强度都大于3种对比复合材料.经过100℃下不同天数的热氧老化后,添加防老偶联剂的复合材料表现出良好的性能保持率,优于添加防老剂4020的3种对比材料,表明防老偶联剂具有更好的防护效果.
A silane coupling agent was obtained by reaction of （3-glycidyloxy-propyl）trimethoxysilane （A187） and N-phenyl-1,4-phenylenedi-amine （PPDA）. Its structure was characterized by 1H-NMR, IR and MS. After that, different amounts of the silane coupling agent were used to in situ modify the silica to prepare antioxidant functionalized silica/NR composites. The processing ability, mechanical properties and antioxidation effect of the composites were compared with those of the carbon black/NR, neat silica/NR and bis（3-triethoxysilylpropyl） tetrasulfane （Si69） modified silica/NR composites. Cure characteristics and RPA results showed that the viscosity, the highest torque, optimum cure time and dispersion of filler of the antioxidant functionalized silica/NR were improved. The mechanical properties of the composites increased with increasing amount of silane coupling agent first, and then reached a plateau. When the amount of silane coupling agent was more than or equal to 10. 8% （wt% to silica）, the tensile strength of the composites was as high as that of carbon black/NR and Si69 modified silica/NR, which was much higher than that of neat silica/NR. Moreover, the tear strength of the composites was higher than that of all references. After air ageing at 100 for different days, the mechanical property retention of the antioxidant functionalized silica/ NR was better than that of all references with antioxidant 4020, which illustrates that the new silane coupling agent has better ageing resistance than antioxidant 4020.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2014年第2期202-209,共8页
Acta Polymerica Sinica
基金
国家自然科学基金青年基金(基金号21004022)
广州市重点实验室建设项目(项目号2012-224-7)资助
关键词
防老化
硅烷偶联剂
白炭黑表面改性
白炭黑
NR复合材料
Antioxidation, Silane coupling agent, Surface modification of silica, Silica/NR composites
