Compressibility of Two Polymer Blend Mixtures
Compressibility of Two Polymer Blend Mixtures
复制标题
两种聚合物共混混合物的压缩性
DOI：
10.1021/ma00117a019
复制
发表时间：
1995
期刊：
影响因子：
5.5
通讯作者：
B. Bauer
中科院分区：
文献类型：
--
作者：
B. Hammouda;B. Bauer
在加压条件下对两种聚合物共混体系进行了小角中子散射测量。在一定的温度和压力范围内，研究了氢化聚苯乙烯(PSD)/聚甲基乙烯基醚(PVME)和PSD/聚甲基丙烯酸丁酯(PBMA)共混物。对于PSD/PVME共混物，研究了三种组成，而对于PSD/PBMA体系，只测量到一种组成。结果表明，压力对两种共混物均有增容作用。我们的PSD/PVME测量表明，在外加压力下，Flory-Huggins X参数的散射强度有很强的压力效应，但组成依赖性并没有减弱；这排除了可压缩性作为X在该共混体系中组成依赖性起源的可能原因。此外，X参数(X=C+D/T，其中T是绝对温度)的熵部分C和热焓部分D都与压力有关。
Small-angle neutron scattering measurements have been performed on two polymer blend systems under pressure. Deuterated polystyrene (PSD)/poly(vinyl methyl ether) (PVME) and PSD/poly-(butyl methacrylate) (PBMA) blends have been investigated over a range of temperatures and pressures. For the PSD/PVME blend, three compositions were investigated, whereas for the PSD/PBMA system, only one composition was measured. It was found that pressure has the effect of enhancing miscibility for both blends. Our PSD/PVME measurements have shown strong pressure effects on the scattered intensity but no weakening of the composition dependence of the Flory-Huggins X parameter under applied pressure ; this eliminates compressibility as a possible cause for the origin of the composition dependence of X in this blend system. Moreover, both the entropic part, C, and the enthalpic part, D, of the X parameter (X = C + D/T, where T is absolute temperature) were found to depend on pressure.