Easy stereo-complex crystal supramolecular stereoblock polylactic acid and preparation method thereof
A stereocomposite crystallization and supramolecular technology, applied in the field of polymer materials, can solve the problems of low strength and difficult processing, and achieve the effects of improving heat resistance, less pollution and low cost
Active Publication Date: 2016-03-02
元嘉生物科技(衢州)有限公司
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Problems solved by technology
[0006] The patent "Polylactic acid / hydrogenated polybutadiene supramolecular elastomer regulated by stereocomplex crystallization" (application number CN2015103999568) has been reported in UPy bonded PLLA-PEB-PLLA and PDLA-PEB-PDLA blends (where PEB is a random copolymer of ethylene / butylene), which is easy to form stereocomplex crystals, and PLA / PEB supramolecular elastomers containing stereocomplex crystal hard regions can be obtained, but in the blend, PLLA and PDLA blocks The molecular weight is small (≤4800g / mol), and the PLLA and PDLA copolymers with small molecular weight are prone to stereocomplex crystallization (Pan et al., J.Phys.Chem.B2015, 119, 6462), in PEB without soft segment When present, the low molecular weight PLLA / PDLA blend material is brittle, difficult to process, and has extremely low strength
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[0053] Dissolve PLLA and PDLA with a certain mass ratio of UPy-end functionalized in chloroform, so that the concentration of the polymer solution is 50g / L. After stirring and mixing evenly, the polymer solution is cast in a polytetrafluoroethylene petri dish; at room temperature The solvent was completely evaporated, and then the polytetrafluoroethylene petri dish was dried in a vacuum oven at 70° C. for 6 hours to obtain supramolecular stereoblock PLA with easy stereocomplex crystallization.
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Abstract
The present invention relates to the bio-based biodegradable polymer material technical field, and aims to provide easy stereo-complex crystal supramolecular stereoblock polylactic acid and a preparation method thereof. The easy stereo-complex crystal supramolecular stereoblock polylactic acid comprises a basic unit, the basic unit is double-end-functionalized linear poly-L-lactic acid(PLLA) and poly-D-lactic acid(PDLA), or three-end-functionalized three-arm star-shaped poly-L-lactic acid and poly-D-lactic acid, the terminal group of the basic unit is 2-ureido-4 [1H]-pyrimidinone group capable of forming a quadruple hydrogen bond, the preparation method comprises the steps of preparing of UPy-end-functionalized poly-L-lactic acid and poly-D-lactic acid and preparing of PLLA / PDLA supramolecular stereoblock polymer by blending. The supramolecular stereoblock PLA prepared by the method has high stereocomplex crystallization capacity, crystallinity, and faster crystallization rate, the PLA heat resistance is effectively improved, and meanwhile the solvent resistance and hydrolysis resistance can be improved.
Description
technical field [0001] The invention relates to the technical field of bio-based and biodegradable polymer materials, in particular to supramolecular stereoblock polylactic acid with easy stereocomplex crystallization and a preparation method thereof. Background technique [0002] Supramolecules refer to ordered molecular complexes formed by non-covalent interactions between molecules through complementary hydrogen bonds, van der Waals forces, and π-π conjugation. The degree of polymerization of a supramolecular depends on the concentration and association constant of the structural units of the supramolecule (oligomer). Due to their special structures and properties, new supramolecular polymers based on multiple hydrogen bonds have attracted extensive attention of researchers. Among them, the preparation method of 2-ureido-4[1H]-pyrimidinone (UPy) group is simple, and it can self-recognize and form a highly selective and directional AADD-DDAA type quadruple hydrogen bond. ...
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IPC IPC(8): C08L67/04C08G63/91
Inventor 潘鹏举包建娜畅若星单国荣包永忠
Owner 元嘉生物科技(衢州)有限公司