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The effects of styrene-ethylene/propylene (SEP) diblock copolymer on the morphology and mechanical propertiesof polypropylene/polystyrene (PP/PS) blends were investigated. The results showed that SEP diblock copolymer, acting as acompatibilizer in PP/PS immiscible blends, can diminish the coalescence of the dispersed particles, reduce their averageparticle size, change their phase morphologies significantly, and increase the mechanical properties. It was found that SEP has better compatibilization effects on the PP/PS (20/80) blends. 相似文献
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Two kinds of polymer-bound photosensitizers were synthesized, in which anthracene acts as sensitizer moiety,polystyrene (PS) and poly(methyl methylacrylate) (PMMA) serve as solid phase supports, respectively. The photoisomerization of tachysterol to previtamin D3 was carried out with these polymer-bound photosensitizers in ethanol and toluene solutions. The experiment results demonstrate that these solid phase photosensitizers are efficient for the photoisomerization with good recycle property and can be simply separated from the reaction mixtures by filtration. 相似文献
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脲醛树脂胶粘剂及其发展状况 总被引:3,自引:0,他引:3
脲醛树脂是目前使用量最大的木材用胶粘剂,文章主要从脲醛树脂的合成、改性、应用及固化机理等方面,综述了近年来脲醛树脂的研究进展。讨论了脲醛树脂的合成工艺,分析了pH值对脲醛树脂合成工艺的影响。针对脲醛树脂释放甲醛、耐水性差的缺点,列举了脲醛树脂常用的各种改性物质及它们的改性效果。并讨论了脲醛树脂在使用过程中使用的助剂和固化剂。 相似文献