纤维填充液晶聚合物熔体的非线性粘弹性

克彦 荒木, 武 北野, 前川 善一郎
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引用次数: 2

摘要

对碳纤维(CF)和玻璃纤维(GE)填充的半芳香族液晶聚合物(LCP)熔体进行动态粘弹性测试,定量分析其非线性粘弹性特性。采用剪切应力波傅里叶展开法研究了LCP及其CF和GF填充聚合物体系的动态粘弹性行为。对于LCP,叔项G′3和G′3比它们的初级项G′1和G′1小得多,粘弹性性质几乎是线性的。另一方面,两种类型的CF填充LCP体系表明,振荡角的增加使G′1和G′1随i的增加而依次减小,但G′3和G′3的值足够大,不能忽略,即两种聚合物体系表现出相似的非线性粘弹性行为。GF填充的LCP系统与CF填充的LCP系统表现出相同的趋势,G′1和G′1都有明显的高原区。此外,G3 /G1、G'3/G'1和G'3/G'1的值被认为是其非线性程度的指标,纤维填充的LCP体系对co的依赖没有显著差异,尽管GF填充体系在高co区域的G'3/G'1的非线性程度明显高于CF填充体系。
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Nonlinear Viscoelasticity of Fiber-Filled Liquid Crystalline Polymer Melts
Melts of semi-aromatic liquid crystalline polymer (LCP) filled with carbon fiber (CF) and glass fiber (GE) were measured for dynamic viscoelasticity to quantitatively analyze their nonlinear viscoelastic properties. The LCP and its CF and GF filled polymer systems were examined for dynamic viscoelastic behaviors by Fourier expansion of shear stress wave.For LCP the tertiary terms G'3 and G''3 are considerably smaller than their primary terms G'1 and G''1, ;the viscoelastic property is almost linear.On the other hand, the two types of CF filled LCP systems showed that an increase in the oscillatory angle decreased G'1 and G''1 in sequence with increasing i.However, the G'3 and G''3 values are large enough not to be negligible, i.e.both polymer systems show similar nonlinear viscoelastic behaviors.A study on the GF filled LCP systems showed the same tendency as the CF filled systems;both G'1 and G''1 have apparently a plateau region.Furthermore, the values of G3 /G1, G'3/G'1 and G''3/G''1 are recognized as the indicator of the degrees of their nonlinearity, and the fiber filled LCP systems showed no significant difference in their dependency on co, although the GF filled systems showed a markedly higher nonlinearity of G''3/G''1 than the CF filled systems in a high co region.
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