| Preparation of Strong and Tough Thermoplastic Polyisoprene by Grafting β-oligopeptides |
| Received:May 03, 2021 Revised:May 03, 2021 |
| DOI：10.12136/j.issn.1000-890X.2021.11.0803 |
| Key Words: polyisoprene；oligopeptides；β-folded sheets；coordination polymerization；hydroxyl |
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| Abstract: |
| Abstract：In this study，hydroxyl functionalized thermoplastic polyisoprene（PIP-OH） was prepared
by random copolymerization of isoprene（IP） and hydroxy isoprene derivatives（IP-OH）using rare earth
coordination polymerization catalyst Nd（VA）3/Al（i-Bu）3/Al（i-Bu）2Cl. Thermoplastic β tetrapeptide
polyisoprene（PIP-β4A） was synthesized by grafting β-alanine tetrapeptide（β4A） into PIP-OH. The results
showed that β4A enhanced the strength and toughness of PIP-OH. The tensile strength of PIP-β4A reached
12. 07 MPa，which was 44. 7 times the tensile strength of PIP-OH. In addition，Fourier transform infrared
spectrum，X-ray diffraction spectrum and atomic force microscope analysis confirmed that β4A formed
β-folded sheets in the PIP matrix，which was the main factor for the excellent performance of PIP-β4A. |
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