Van Lokeren Luk, Gotzen Nicolaas-Alexander, Pieters Ronny, Van Assche Guy, Biesemans Monique, Willem Rudolph, Van Mele Bruno
Department of Materials and Chemistry, Research Unit Physical Chemistry and Polymer Science (MACH/FYSC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
Chemistry. 2009;15(5):1177-85. doi: 10.1002/chem.200801555.
The state diagram of a blend consisting of a copolymer containing ethylene oxide and propylene oxide, P(EO-ran-PO), and poly(ether sulfone), PES, is constructed by using modulated-temperature differential scanning calorimetry (MTDSC), T(2) NMR relaxometry, and light scattering. The apparent heat capacity signal in MTDSC is used for the characterization of polymer miscibility and morphology development. T(2) NMR relaxometry is used to detect the onset of phase separation, which is in good agreement with the onset of phase separation in the apparent heat capacity from MTDSC and the cloud-point temperature as determined from light scattering. The coexistence curve can be constructed from T(2) values at various temperatures by using a few blends with well-chosen compositions. These T(2) values also allow the detection of the boundary between the demixing zones with and without interference of partial vitrification and are in good agreement with stepwise quasi-isothermal MTDSC heat capacity measurements. Important interphases are detected in the heterogeneous P(EO-ran-PO)/PES blends.
通过使用调制温度差示扫描量热法（MTDSC）、T₂ NMR弛豫测量法和光散射法构建了由含有环氧乙烷和环氧丙烷的共聚物P(EO-ran-PO)与聚醚砜（PES）组成的共混物的状态图。MTDSC中的表观热容信号用于表征聚合物的混溶性和形态发展。T₂ NMR弛豫测量法用于检测相分离的起始点，这与MTDSC表观热容中的相分离起始点以及光散射法测定的浊点温度高度一致。通过使用几种组成精心选择的共混物，可以根据不同温度下的T₂值构建共存曲线。这些T₂值还能够检测出有部分玻璃化干扰和无部分玻璃化干扰的相分离区域之间的边界，并且与逐步准等温MTDSC热容测量结果高度一致。在非均相的P(EO-ran-PO)/PES共混物中检测到了重要的界面相。
