ON THE CRYSTAL TEXTURE OF LINEAR POLYARYLS (PEEK, PEK AND PPS)
ON THE CRYSTAL TEXTURE OF LINEAR POLYARYLS (PEEK, PEK AND PPS)
复制标题
DOI：
10.1007/bf01132406
复制
发表时间：
1987-05-01
影响因子：
4.5
通讯作者：
BLUNDELL, DJ
中科院分区：
文献类型：
--
作者：
WADDON, AJ;HILL, MJ;BLUNDELL, DJ
本文研究了三种线型聚芳醚酮（PEEK）、聚醚酮（PEK）和聚苯硫醚（PPS）的结晶形态和熔体球晶中的分子取向，后者还涉及含碳纤维聚合物的实验。除了在溶液生长的晶体中观察到的与其他地方同时报道的那些一致的个体特征之外，三种聚合物的本协调结果强调了该聚合物家族的共同结晶行为和纹理。这些共同的特征包括作为链折叠症状的层状结构的存在、指示单轴生长的针状形状（在所有三种情况下都是生长方向）和不规则的晶体边缘。这些晶体的束发展，然后很容易导致一个假设的radiob轴取向的球晶，直接确认在熔融结晶的样品具有transcrystalline纹理诱导成核碳纤维。对碳纤维效果的观察使我们注意到这些纤维的晶体成核效果和分离距离对聚合物基质的所得晶体织构的组合影响：改变两种效果的相对大小，甚至可以逆转样品中的整体晶体取向。这种考虑应该与一般的具有可结晶热塑性基体的复合材料中的晶体织构发展有关。
Three linear ppolyaryls, polyetheretherketone (PEEK) polyetherketone (PEK) and polyphenylenesulphide (PPS) have been examined regarding crystal morphologies as obtained from solutions and molecular orientation in melt grown spherulites, the latter involving also experiments on the carbon fibre containing polymer. In addition to the individual features observed in solution grown crystals agreeing with those being reported concurrently from elsewhere, the present coordinated results on three polymers underline the common crystallization behaviour and texture for this family of polymers. These common features comprise the existence of lamellae as symptomatic of chain folding, acicular shapes indicative of uniaxial growth (bbeing the growth direction in all three cases), and irregular crystal edges. The sheaf development of these crystals then leads readily to a postulated radiolb-axis orientation in spherulites, confirmed directly in melt crystallized samples possessing transcrystalline textures induced by nucleating carbon fibres. Observations on the effect of carbon fibres drew our attention to the combined influence of the crystal nucleating effect and separation distance of these fibres on the resulting crystal texture of the polymer matrix: varying the relative magnitude of the two effects, can even reverse the overall crystal orientation in the sample. Such considerations should be pertinent to crystal texture development in composites with crystaallizable thermoplastic matrices in general.