白炭黑填充羧基丁苯橡胶的多层次微观结构研究
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- 英文论文题名：A Study on Multilayer Microstructure of Nanosilica filled Carboxylated Styrene-Butadiene Rubber
- 论文作者：杨瑞权 ; 宋义虎 ; 郑强
- 英文论文作者：Ruiquan Yang ; Yihu Song ; Qiang Zheng ; Department of Polymer Science and Engineering ; Zhejiang University
- 年：2016
- 作者机构：浙江大学高分子科学与工程学系;
- 论文关键词：羧基丁苯橡胶(XSBR) ; 纳米二氧化硅 ; 固定化层 ; 温度调制差示扫描量热(TMDSC) ; 流变
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十七分会：流变学
- 语种：中文
- 分类号：TQ333.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十七分会 ; 流变学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：149k
- 原文格式：D
- 会议级别：全国
摘要
分别采用悬浮液吸附混合法、胶乳混合并开炼法制备填充份数0~300 phr、0~60 phr的羧基丁苯橡胶/白炭黑(XSBR/A200)复合物,采用温度调制差示扫描量热法(TMDSC)研究复合物的玻璃化转变行为,采用动态流变法研究A200的补强机理。TMDSC测试结果显示,"玻璃化层"~([1])含量与填充份数呈线性关系,且与混合方式无关。流变与TMDSC测试结果对比显示,A200粒子表面存在两层分子能动性不同的受限层,其中玻璃化层内层不能发生玻璃化转变,"受限外层"~([2])可发生玻璃化转变,但在高频下呈刚性行为。根据等价球形模型,A200粒子半径为6.8 nm,玻璃化层与"受限外层"厚度分别为1.0 nm、1.6 nm。
Carboxylated styrene-butadiene rubber/nanosilica(XSBR/A200) composites have been prepared by absorption mixing method(0~300 phr) and latex mixing plus extra open-milling method(0-60 phr).Temperature modulated differential scanning calorimetry(TMDSC) was used to investigate glass-transition behavior of the composites prepared by both methods while dynamic mechanical tests were carried out to investigate the reinforcement of the compounds prepared by the latex mixing plus extra open-milling methods.TMDSC results show that the content of the glassy layer immobilized in the close vicinity of A200 nanoparticles increases proportionally with silica loading regardless of mixing methods.Comparision between TMDSC and rheology results indicates that there exists an outer absorption layer besides the glassy layer in compounds.The glassy layer corresponds to the XBSR fraction surrounding nanosilica that does not undergo glass transtion.On the other hand,the outer layer is able to undergo glass transition together with the bulky rubber phase but it behaves rigid at high frequencies.Both these two layers contribute to the reinforcement effect.Assuming equivalent A200 spheres of 6.8 nm in radius,equivalent thicknesses of the glassy and outer layers are estimated as 1.0 nm and 1.6 nm,respectively.
Carboxylated styrene-butadiene rubber/nanosilica(XSBR/A200) composites have been prepared by absorption mixing method(0~300 phr) and latex mixing plus extra open-milling method(0-60 phr).Temperature modulated differential scanning calorimetry(TMDSC) was used to investigate glass-transition behavior of the composites prepared by both methods while dynamic mechanical tests were carried out to investigate the reinforcement of the compounds prepared by the latex mixing plus extra open-milling methods.TMDSC results show that the content of the glassy layer immobilized in the close vicinity of A200 nanoparticles increases proportionally with silica loading regardless of mixing methods.Comparision between TMDSC and rheology results indicates that there exists an outer absorption layer besides the glassy layer in compounds.The glassy layer corresponds to the XBSR fraction surrounding nanosilica that does not undergo glass transtion.On the other hand,the outer layer is able to undergo glass transition together with the bulky rubber phase but it behaves rigid at high frequencies.Both these two layers contribute to the reinforcement effect.Assuming equivalent A200 spheres of 6.8 nm in radius,equivalent thicknesses of the glassy and outer layers are estimated as 1.0 nm and 1.6 nm,respectively.
引文
[1]Ruggerone,R.;Geiser,V.;Dalle Vacche,S.;Leterrier,Y.Macromolecules.2010,43:10490.
[2]Medalia,A.I.J Colloid Interface Sci.1970,32:115.
[2]Medalia,A.I.J Colloid Interface Sci.1970,32:115.