应用化学2018，Vol.35Issue(2)：174-180,7.DOI:10.11944/j.issn.1000-0518.2018.02.170056
Diels-Alder反应可控制备交联等规聚丙烯
Controlled Preparation of Crosslinked Isotactic Polypropylene via Diels-Alder Reaction
摘要
Abstract
Cross-linking is a commonly used method for polyolefin modification to improve the material′s mechanical properties,thermo-and chemical resistance.High molecular mass(Mw)iPPs containing reactive anthracene groups were synthesized by coordination copolymerization.Crosslinked iPP films could be prepared by adding bi-functional N,N′-1,4-phenylene bismaleimide as a crosslinker to react with the pendent anthracene groups during the solvent casting process of the film.The cross-linking degree of the films could be easily tuned by the addition of the crosslinker.Characteristic absorption bands in Fourier transform infrared (FT-IR)spectra of the crosslinked films and gravimetric analysis of the insoluble portion could be used to determine the crosslinking degree.Differential scanning calorimetry(DSC)and wide-angle X-ray diffraction (WAXD)analysis revealed that the crystallinity and crystallization capability of the films decreased followed with the increase of cross-linking degree,which were mainly caused by the restricted chain movement.On the other hand,according to DMA analysis,the loss modulus dropped gradually with the increase of cross-linking degree,indicating the loss of toughness brought by cross-linking.The increased Tgdetected from loss angle curves indicated the enhancement of thermoresistance.The tensile stress of the crosslinked iPP films were improved by forming polymer network containing more force bearing point, while the elongation at break dropped drastically because of the chains′poor movability.关键词
聚丙烯/Diels-Alder反应/交联Key words
polypropylene/Diels-Alder reaction/crosslinking分类
化学化工引用本文复制引用
张德广,李彦国,崔磊,李悦生..Diels-Alder反应可控制备交联等规聚丙烯[J].应用化学,2018,35(2):174-180,7.基金项目
国家自然科学基金(21234006)项目资助Supported by the National Natural Science Foundation of China(No.21234006) （21234006）
