炭黑填充苯乙烯-丁二烯-苯乙烯三嵌段共聚物导电泡沫材料
夏利平
三一重工股份有限公司，长沙 410100
Carbon Black Filled Poly (styrene-b-butadiene-b-styrene) Tri-Block Copolymer Conductive Foams
Xia Liping
Sany Heavy Industry Co.,Ltd.,Changsha 410100,China
摘要：为研究功能助剂对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)导电泡沫材料的影响，选择以氧化锌(ZnO)和硬脂酸锌(ZnSt)为发泡助剂，偶氮二甲酰胺(AC)为发泡剂，过氧化二异丙苯(DCP)为交联剂，炭黑(CB)为导电助剂。采用差示扫描量热仪表征了 ZnO/ZnSt 用量对 AC 分解温度的影响，通过硫化仪、物理性能测试 、电性能测试以及扫描电子显微镜等测试研究了 CB 含量对 SBS 导电发泡材料的硫化发泡特征性能、物理性能、电性能和泡孔微观结构的影响，以及 AC 含量对电性能和泡孔微观结构的影响。 结果表明：采用 ZnO 与 ZnSt 复配使用可高效降低 AC 发泡温度 ；当CB 含量为 15 份时，SBS 复合材料的硫化扭矩和发泡时间突增，泡沫由绝缘体变成半导体，当 CB 含量为 20 份时，泡沫材料的压缩永久变形明显下降 ，泡沫由半导体变成导体，CB 含量变化对泡孔结构影响较小 ；AC 含量增加会导致泡孔截面从圆形变成多边形，泡孔壁变薄，泡沫的导电性下降。
Abstract：In order to study the effect of functional additives on poly (styrene-b-butadiene-b-styrene) tri-block copolymer (SBS) conductive foams, zinc oxide (ZnO) and zinc stearate (ZnSt) were selected as foam activators, azodicarbonamide (AC) as the blowing agent, dicumyl peroxide (DCP) as the curing agent, and carbon black (CB) as the conductive agent. Differential scanning calorimetry was used to characterize the effect of ZnO/ZnSt content on the decomposition temperature of AC. The effects of CB content on the vulcanized foaming characteristics, physical properties, electrical properties and cell microstructure of SBS conductive foams were studied by vulcanization instrument, physical properties test, electrical properties test and scanning electron micros‐ copy. The effects of AC content on electrical properties and cell microstructure were also studied. The results show that the combination of ZnO and ZnSt can effectively reduce the decomposition temperature of AC. When the content of CB is 15 phr, the vulcanization torque and foaming time of SBS composites increase sharply, the foam material becomes a semiconductor from an insulator. When the CB content is 20 phr, the compressive permanent deformation of the foam material is obviously reduced, the foam material becomes a conductor from a semiconductor. The change of CB content has little effect on the structure of the bubble hole. With the increasing of AC content, the cross section of the bubble becomes polygon, the wall of the bubble becomes thinner, and the conductivity of the foam decreases.
关键词：泡沫材料；导电性；苯乙烯-丁二烯-苯乙烯嵌段共聚物；炭黑
Keywords：foams; electrical conductivity; poly （styrene-b-butadiene-b-styrene） tri-block copolymer; carbon black
本文引用格式：
夏利平.炭黑填充苯乙烯-丁二烯-苯乙烯三嵌段共聚物导电泡沫材料[J].工程塑料应用，2023，51(8)：44-49.
Xia Liping. Carbon black filled poly (styrene-b-butadiene-b-styrene) tri-block copolymer conductive foams[J]. Engineering Plastics Applica‐tion，2023，51(8)：44-49.
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