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微流道中聚合物熔体的弹性特性研究 被引量:1

Elastic Characteristics of Polymer Melts Through Micro-channels
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摘要 采用双机筒毛细管流变仪,以直径1.5mm的口模作为宏观流道、直径0.5mm的口模作为微观流道、直径1.0mm的口模作为临界参考,通过毛细管入口压力降和聚合物熔体应力松弛时间研究了微尺度下聚甲基丙烯酸甲脂(PMMA)、聚苯乙烯(PS)、高密度聚乙烯(PE-HD)及聚丙烯(PP)4种聚合物熔体的弹性特性,并讨论了在口模直径为0.5mm条件下温度对入口压力降和应力松弛时间的影响。结果表明,微流道中4种聚合物熔体的入口压力降与应力松弛时间与宏观流道相比均有增大的趋势,且流道尺寸越小,增大趋势越明显;随着剪切速率的增大,4种聚合物熔体的入口压力降增大,但在高剪切速率下,增大趋势变缓;微流道中,随着温度的提高,4种聚合物熔体的入口压力降降低,应力松弛时间变短。 The melt elastic character of four kinds of polymers(PMMA,PS,PP,and PE-HD)was investigated using a double capillary rheometer.The effects of temperature on entrance pressure drop and stress relaxation time of melt were discussed.The entrance pressure drop and stress relaxation time of all polymer melts increased with decreasing channel size,and the smaller the channel size,the more obvious the effect.The entrance pressure drop increased with increasing shear rate,however,the effect became less obvious under high shear rates.The entrance pressure drop and stress relaxation time decreased with increasing temperature.
出处 《中国塑料》 CAS CSCD 北大核心 2014年第10期76-82,共7页 China Plastics
关键词 聚合物 微注射成型 入口压力降 应力松弛时间 弹性特性 polymer micro-injection molding entrance pressure drop stress relaxation time elastic character
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