| 增容高抗冲聚苯乙烯/高乙烯基聚丁二烯橡胶热塑性硫化胶的形态演变及增容机制 |
| Phase Morphology Evolution and Compatibilizing Mechanism of Compatibilized HIPS/HVPBR TPV |
| 投稿时间：2014-08-24 修订日期：2014-08-24 |
| DOI： |
| 中文关键词: 高抗冲聚苯乙烯 高乙烯基聚丁二烯橡胶 形态演变 增容 动态硫化 微观结构 |
| 英文关键词: HIPS HVPBR phase morphology evolution compatibilization dynamic vulcanization microstructure |
| 基金项目:山东省自然科学基金(ZR2012EMM002)；山东省高等学校科技计划项目(J12LA15)；青岛市科技发展计划项目(12-1-4-3-(9)-jch)。 |
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| 中文摘要: |
| 采用动态硫化法制备了基于高抗冲聚苯乙烯(HIPS)/高乙烯基聚丁二烯橡胶(HVPBR)的热塑性硫化胶(TPV),以苯乙烯-丁二烯-苯乙烯(SBS)改善其界面相容性；通过场发射扫描电子显微镜(FE-SEM)观察动态硫化过程中橡胶相的形态演变,研究了增容剂对TPV微观相结构的影响并探讨了增容机制。结果表明,随着动态硫化的进行,橡胶相在交联的同时逐渐被撕碎为分散相,在动态硫化至6 min (t90)时橡胶相呈稳定的类球状形貌,其粒径为3~5 μm；较未增容TPV而言,增容TPV中橡胶相的粒子明显细化且表面粗糙；在动态硫化中,交联的橡胶相在剪切力的撕裂作用下,表面形成了纳米尺度的杂乱的片层状结构,显著增加了界面面积和界面作用力,并在宏观上表现为TPV机械性能的大幅度提高。 |
| 英文摘要: |
| Thermoplastic vulcanizates (TPV) based on high impact polystyrene (HIPS)/high vinyl polybutadiene rubber (HVPBR) blends were prepared by dynamic vulcanization, where styrene-butadiene-styrene block copolymer (SBS) was used as a compatilizer. The Phase morphology evolution was researched by field emission scanning electron microscope, and the influence of SBS on the microstructure of the prepared TPVs and the compatibilizing mechanism were also investigated. Experimental results indicated that the rubber phase was fragmented continuously during the dynamic vulcanization and was evolved into spherical particles with the diameters of 3-5 μm at 6 min (t90). Compared with that of HIPS/HVPBR TPV, the diameters of HVPBR particles in HIPS/SBS/HVPBR TPV were much smaller and the surfaces were much rougher. The microstructure images of HIPS/SBS/HVPBR TPV indicated that large amounts of clutter-like lamellar structure were formed in the surface of the rubber particles during the dynamic vulcanization. It would inevitably lead to the remarkably increased interface area and the enhanced interface interaction between the crosslinked HVPBR rubber and HIPS resin, resulting in the significant improvement of the mechanical properties. |
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