Steric compound crystal controlled polylactic acid/hydrogenated polybutadiene supermolecular elastomer

Abstract

The invention relates to the technology of macromolecular thermoplastic elastomers, and aims to provide a steric compound crystal controlled polylactic acid/hydrogenated polybutadiene supermolecular elastomer. The product is composed of two compounds which are UPy-PLLA-PEB-PLLA-UPy and UPy-PDLA-PEB-PDLA-UPy respectively; in the UPy-PLLA-PEB-PLLA-UPy, chiral carbon in a PLLA block is of a left-handed structure; in the UPy-PDLA-PEB-PDLA-UPy, chiral carbon in a PDLA block is of a right-handed structure; and in the two compounds, the UPy-PLLA-PEB-PLLA-UPy occupies 10% to 90%, and the UPy-PDLA-PEB-PDLA-UPy occupies 90% to 10%. The UPy bonded PLA/PEB supermolecular polymer elastomer is prepared by adopting steric compound crystallized PLLA/PDLA as a hard area and PEB as a soft segment, and the hard segment of the obtained elastomer can be crystallized, and the elastomer is high in melting point, strength and modulus; the content of steric compound crystal can be adjusted by changing the mixed proportion of the two compound, so that the strength, modulus and heat resistance of the elastomer are convenient to control; and by adopting the biology base and biology degradable PLLA and PDLA as the hard segment of the supermolecular elastomer, the pollution generated to the environment is little, the elastomer is green and environment-friendly, and the resources are saved.

Description

technical field [0001] The invention relates to the technical field of polymer thermoplastic elastomers, in particular to supramolecular elastomers containing stereocomplex crystalline polylactic acid hard segments and a preparation method thereof. Background technique [0002] Supramolecular elastomers are a new class of polymer elastomer materials that are all or part of the structure combined by non-covalent bonds such as hydrogen bonds, metal coordination, and π-π stacking interactions. Among them, the 2-ureido-4[1H]-pyrimidinone (UPy) group itself can form a quadruple hydrogen bond interaction, and the bonding force is close to a covalent bond, which is an ideal structure for the preparation of hydrogen bonded supramolecular polymers unit. Due to the reversibility of hydrogen bonds, supramolecular polymers functionalized by UPy ends usually have excellent properties such as environmental responsiveness, shape memory, and self-healing, and thus have attracted extensive ...

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Problems solved by technology

[0005] In the published invention patent (application number: CN201510058848.4), it has been reported that the hard segment is PLLA or racemic PLA (PDLLA), and the soft segment is the UPy quadruple hydrogen bond group of hydrogenated polybutadiene (PEB). group-bonded supramolecular elastomers, but neither hard segment PLLA nor PDLLA crystallizes or crystallizes in UPy-bonded PLLA-PEB-PLLA and PDLLA-PEB-PDLLA supramolecular polymers due to the hindrance of UPy groups Very low degree, resulting in low mechanical strength, modulus and heat resistance of the elastomer, poor processability

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