Unsaturated polylactic acid block copolymer and preparation method thereof

A block copolymer, unsaturated technology, applied in the field of unsaturated polylactic acid block copolymer and its preparation, can solve the problem of polylactic acid sheet tearing, uneven wall thickness of thermoformed products, shape of molded products can not be the same, etc. problems, to achieve the effect of improving processing performance, increasing melt strength, and low synthesis temperature
CN101864062BActive Publication Date: 2012-05-23NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Publication Date
2012-05-23

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Abstract

The invention discloses a block copolymer obtained by ring-opening copolymerization of 6,7-dihydro-5H-oxepin-2-ketone (DHO) series unsaturated lactone and lactide, and a preparation method thereof. The invention induces a DHO series unsaturated monomer into a main chain of polylactic acid to obtain an unsaturated polylactic acid block copolymer with a main chain containing a carbon-carbon double bond, and can induce a branch chain with appropriate length on the main chain of the polylactic acid by utilizing the carbon-carbon double bond with reactivity, which has great significance for improving the melt strength and processability of polylactic acid material. In addition, the preparation method of the unsaturated polylactic acid block copolymer has simple operation process, low synthesistemperature, and can adjust the chain length of each component in the unsaturated polylactic acid block copolymer and the molecular weight of the copolymer by controlling the adding amount of each reactant so as to obtain the unsaturated polylactic acid block copolymers with different properties.
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Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and relates to an unsaturated polylactic acid block copolymer and a preparation method thereof. Background technique

[0002] Polylactic acid (PLA) is an aliphatic polymer. As a chemically synthesized biodegradable polymer derived from biological resources and completely degraded by microorganisms, it can not only alleviate the excessive consumption of petroleum resources, but also solve the traditional Environmental problems caused by plastic. In addition, because polylactic acid is non-toxic and has good biocompatibility, it can be degraded into lactic acid in the human body to enter the tricarboxylic acid cycle, and finally degraded into carbon dioxide and water after normal metabolism. Therefore, polylactic acid is widely used in Surgical sutures, bone fixation repair materials, implant materials in vivo, drug controlled release materials, etc., have become one of the most valued m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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