期刊
POLYMER
卷 172, 期 -, 页码 196-204出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2019.03.062
关键词
High T-g and thermostability; Phytic acid; Polynorbornene
资金
- National Natural Science Foundation of China [51873203]
- Key Projects of Jilin Province Science and Technology Development Plan [20180201087GX]
- Special Projects of Technology Transfer and Cooperation between China and Arab states [2017EZ07]
- Jilin Province [2019SYHZ0003]
- Chinese Academy of Sciences [2019SYHZ0003]
Fabrication of thermosets with high glass transition temperature (T-g) has been a challenge in recent years. In this study, a facile method is presented to prepare high T-g polymers with good thermostability. Firstly a chiral palladium (II) complex bearing an iminophenyl oxazolinylphenylamine (IPOPA) ligand, IPOPA-PdCl, has been prepared and characterized, which exhibits high activities for vinyl-(co)polymerization of norbornene (NB) and 5-vinyl-2-norbornene (VNB) in the presence of various cocatalysts. Then the synthesized copolymer P(NB-vinylNB) is epoxidized to generate epoxy product P(NB-epoxyNB). Phytic acid (PA), which is a naturally component in plants, is then used to cross-link P(NB-epoxyNB) for further restricting molecular motions. The obtained crosslinked P(NB-epoxyNB)-PA exhibits high T-g of up to 351.5 degrees C. This work not only provides insight into the design of novel semi-salen type palladium (II)-based catalyst for vinyl-(co)polymerization of NB and its derivative, but also shows a feasible strategy to design thermosetting PNB-based polymer with high T-g and thermostability.
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