Citation: ZHANG Deguang, LI Yanguo, CUI Lei, LI Yuesheng. Controlled Preparation of Crosslinked Isotactic Polypropylene via Diels-Alder Reaction[J]. Chinese Journal of Applied Chemistry, ;2018, 35(2): 174-180. doi: 10.11944/j.issn.1000-0518.2018.02.170056 shu

Controlled Preparation of Crosslinked Isotactic Polypropylene via Diels-Alder Reaction

ZHANG Deguang ^a,b ,
LI Yanguo ^a,, ,
CUI Lei ^a ,
LI Yuesheng ^c,,

a.
Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of Chinese Academy of Sciences, Changchun, 130022, China
c.
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

Corresponding author: LI Yanguo, liyg@ciac.ac.cn LI Yuesheng, ysli@tju.edu.cn
Received Date: 2 March 2017
Revised Date: 22 March 2017
Accepted Date: 28 March 2017

Fund Project: Supported by the National Natural Science Foundation of China(No.21234006)the National Natural Science Foundation of China 21234006

Figures(5)

Cross-linking is a commonly used method for polyolefin modification to improve the material's mechanical properties, thermo-and chemical resistance. High molecular mass(M_w) 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 T_g detected 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.
- polypropylene,
- Diels-Alder reaction,
- crosslinking
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