Small-Angle X-ray and Neutron Scattering from Bulk and Oriented Triblock Copolymer Gels
Small-Angle X-ray and Neutron Scattering from Bulk and Oriented Triblock Copolymer Gels
复制标题
块状和定向三嵌段共聚物凝胶的小角 X 射线和中子散射
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
H. Reynaers
中科院分区：
文献类型：
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作者：
N. Mischenko;K. Reynders;M. Koch;K. Mortensen;J. Pedersen;F. Fontaine;R. Graulus;H. Reynaers
用小角X射线散射（SAXS）和中子散射（SANS）研究了聚苯乙烯-嵌段橡胶-嵌段聚苯乙烯凝胶。橡胶中间嵌段是聚（乙烯/丙烯）（PS-PEP-PS）或聚（乙烯/丁烯）（PS-PEB-PS）。这些热塑性塑料的凝胶具有类似的超结构，其由相关联的聚苯乙烯（PS）嵌段的域组成，通过溶解在增量油中的中间嵌段连接。微相分离在PS-PEP-PS凝胶中更明显，并导致明显的域间散射最大值和形状因子振荡。PS域的排序是嵌段共聚物浓度、摩尔质量、末端嵌段/中间嵌段比、变形和温度的函数。高达150%延伸的变形在室温下是可逆的。用两种不同的模型拟合了未拉伸样品的散射模式：硬球液体模型和具有局部配位的无序固体模型
Gels of polystyrene-block-rubber-block-polystyrene were investigated by small-angle X-ray (SAXS) and neutron (SANS) scattering. The rubber midblock was either poly(ethylene/propylene) (PS-PEP-PS) or poly(ethylene/butylene) (PS-PEB-PS). The gels of these thermoplasts have similar superstructures consisting of domains of associated polystyrene (PS) blocks, connected by the midblocks which are dissolved in an extender oil. The microphase separation is more pronounced in the PS-PEP-PS gels and results in clear interdomain scattering maxima and form factor oscillations. The ordering of the PS domains is a function of block copolymer concentration, molar mass, end block/midblock ratio, deformation, and temperature. Deformations up to 150% extension are reversible at room temperature. The scattering patterns of the unstretched samples were fitted with two different models: a hard-sphere liquid model and a model of a disordered solid with local coordination