Polylactic acid/hydrogenated polybutadiene thermoplastic supramolecular elastomer and preparation method thereof

Abstract

The invention relates to a high molecular thermoplastic elastomer technology, and aims to provide a polylactic acid / hydrogenated polybutadiene thermoplastic supramolecular elastomer and a preparation method thereof. The polylactic acid / hydrogenated polybutadiene thermoplastic supramolecular elastomer contains a PLA-PEB-PLA triblock copolymer containing a PLA block and a PEB block as a basic unit; and the terminal group of the basic unit is a 2-carbamido-4[1H]-pyrimidone group capable of forming quadruple hydrogen bonds. According to the high molecular thermoplastic elastomer technology, by adjusting the proportions of PLA and PEB, the intensity and the modulus of the elastomer are easy to adjust; because a UPy group is used as the structural unit, the elastomer is high in binding force and has reversibility; the prepared elastomer has better mechanical property; simultaneously, the elastomer also has the functions of memorizing shapes, self-repairing and the like; PLA is used as the hard section of the supramolecular elastomer; PLA can be prepared on the basis of renewable biomass resources and degraded after being used; and the polylactic acid / hydrogenated polybutadiene thermoplastic supramolecular elastomer is low in pollution to the environment, environmentally friendly and resource-saving.

Description

technical field [0001] The invention relates to the technical field of polymer thermoplastic elastomers, in particular to supramolecular elastomers based on polylactic acid / hydrogenated polybutadiene and a preparation method thereof. technical background [0002] Supramolecular elastomers are a new class of polymer materials. Unlike traditional polymer elastomers bonded by covalent bonds, all or part of the structure in supramolecular elastomers is through hydrogen bonds, coordination interactions, and π-π stacking. interactions and other non-covalent bonds. Among them, supramolecular thermoplastic elastomers formed by hydrogen bonding not only have the high elasticity and rheological properties of traditional elastomers, but also due to the reversibility of hydrogen bonds, this type of polymer material shows such as environmental responsiveness, Excellent properties such as shape memory and self-healing have attracted extensive attention and research. Among hydrogen bonde...

AI Technical Summary

Problems solved by technology

When used as a thermoplastic elastomer, the molecular weight of the block copolymer is required to be higher, usually greater than 50,000, but it is difficult to prepare an ABA type tri-block copolymer with a higher molecular weight and a more uniform molecular weight distribution

However, when the molecular weight is small, the film-forming and processability of ABA-type tri-block copolymers are poor, and they cannot be directly used as elastomer materials.

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