Influence of Annealing and Additives on the Crystallization Behavior and Properties of Poly（vinyl chloride）
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第5期
论文作者：刘亚群 ZHANG Chaocan
文章页码：1017 - 1022
摘 要：Acetanilide（AC）,adipic acid（AA） and potassium hydrogen phthalate（PHP） were chosen as additives to accelerate PVC crystallization and improve its mechanical properties.The influences of the additives and annealing on the crystallization behavior,micromorphology and the tensile properties were investigated by the thermal analysis,scanning electron microscopy（SEM） and the tensile test.Based on the analysis results,it was concluded that the melting peaks ranging from 110 to 200 ℃ and 200 to 240 ℃ were caused by the fusion of the fringed micelle crystals and chain-folded crystals respectively.AC advanced the fringed micelle crystal to develop,while AA and PHP promoted obviously the chain-folded crystal to grow.The addition of the foreign additives did not change the growth pattern of PVC crystallites,the growth of the micelle crystal was favorable at 110 ℃,and the chain-folded crystal was developed at higher temperature.For PVC/ AA and PVC/PHP,when annealed at 110 ℃,a regular nest like network was formed,the crystallinity and the crystallite size were increased as well,and as a result,the tensile strength,Young’s modulus and the elongation at break point were improved simultaneously and greatly.
刘亚群1，ZHANG Chaocan2
1. Department of Applied Chemistry,School of Science,Wuhan University of Technology2. School of Materials Science and Engineering,Wuhan University of Technology
摘 要：Acetanilide（AC）,adipic acid（AA） and potassium hydrogen phthalate（PHP） were chosen as additives to accelerate PVC crystallization and improve its mechanical properties.The influences of the additives and annealing on the crystallization behavior,micromorphology and the tensile properties were investigated by the thermal analysis,scanning electron microscopy（SEM） and the tensile test.Based on the analysis results,it was concluded that the melting peaks ranging from 110 to 200 ℃ and 200 to 240 ℃ were caused by the fusion of the fringed micelle crystals and chain-folded crystals respectively.AC advanced the fringed micelle crystal to develop,while AA and PHP promoted obviously the chain-folded crystal to grow.The addition of the foreign additives did not change the growth pattern of PVC crystallites,the growth of the micelle crystal was favorable at 110 ℃,and the chain-folded crystal was developed at higher temperature.For PVC/ AA and PVC/PHP,when annealed at 110 ℃,a regular nest like network was formed,the crystallinity and the crystallite size were increased as well,and as a result,the tensile strength,Young’s modulus and the elongation at break point were improved simultaneously and greatly.
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