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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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流变-导电同步测试法研究炭黑填充高密度聚乙烯的等温结晶行为
DOI: 10.3724/SP.J.1105.2013.12422, PP. 674-678
Keywords: 流变-导电同步测试,高密度聚乙烯,炭黑,复合体系,等温结晶
Abstract:
采用流变-导电同步测试法,研究炭黑(CB)填充高密度聚乙烯(HDPE)在124.3~125.3℃范围的等温结晶行为,发现应变、频率与预降温速率均显著影响等温结晶过程中动态流变与导电行为.动态储能模量(G')与电阻均在结晶过程中发生显著变化.其中,CB粒子在熔体中发生扩散,造成原有逾渗网络结构破坏,导致复合体系电阻在结晶诱导期内增大.随结晶度增加,G'在结晶诱导期附近开始显著增大,其临界时间对应1%~2%相对结晶度;同时,CB粒子在无定形区相互聚集而形成渗流网络结构,使得复合体系电阻显著降低.电阻的变化被认为与CB粒子在熔体中的迁移以及在HDPE晶体生长过程中的聚集行为有关,且比依时性动态流变行为更敏感.
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