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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

Active Publication Date: 2012-05-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature is too low, although the polylactic acid sheet is softened but not completely melted, the shape of the molded product cannot be exactly the same as the shape of the mold; Sagging (sagging), eventually leading to uneven wall thickness of thermoformed products, and even tearing the PLA sheet

Method used

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  • Unsaturated polylactic acid block copolymer and preparation method thereof
  • Unsaturated polylactic acid block copolymer and preparation method thereof
  • Unsaturated polylactic acid block copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 0.1g of fully dried 6,7-dihydro-5H-oxheptan-2-one (DHO) and 0.01g of stannous octoate into a reaction flask with 10ml of toluene, vacuumize it to below 30Pa, and fill it with Dry high-purity nitrogen, then repeat vacuuming and nitrogen filling operations 5 times, and finally vacuumize to 5Pa, seal the reaction bottle, and place it at 50°C for 1 hour of reaction; add 100g of lactide to the reacted product, repeat pumping Vacuum and nitrogen filling operation 10 times, then evacuate to 5Pa and seal the reaction bottle, continue to react for 48 hours, the reaction product is dissolved and precipitated, filtered and dried, and finally unsaturated polylactic acid with a molecular weight of 78Kg / mol and a molecular weight distribution of 1.81 is obtained. block copolymers.

Embodiment 2

[0027] Put 100g of fully dried 6,7-dihydro-5H-oxoheptan-2-one (DHO) and 0.01g of tin protochloride into a 250ml reaction flask filled with 100ml of chloroform, and evacuate to below 30Pa , filled with dry high-purity nitrogen, then repeated vacuuming and nitrogen filling operations 6 times, finally vacuumed to 5Pa, sealed the reaction bottle, and placed it at 40°C for 8 hours; Ester, repeat vacuuming and nitrogen filling operation 8 times, then vacuumize to 5Pa and seal the reaction bottle, continue to react for 5 hours, the reaction product is filtered and dried after dissolving and precipitating, and finally obtains a compound with a molecular weight of 70Kg / mol and a molecular weight distribution of 1.36. Unsaturated polylactic acid block copolymer.

Embodiment 3

[0029] 5 g of well-dried 6,7-dihydro-5H-oxahept-2-one (DHO), 45 g of well-dried 6,7-dihydro-3H-oxahept-2-one (DHO2) and 0.015 g of dihydrogen Put butyltin oxide into a 250ml reaction bottle containing 50ml tetrahydrofuran, vacuumize it to below 30Pa, fill it with dry high-purity nitrogen, then repeat the vacuumization and nitrogen filling operation 6 times, and finally vacuumize it to 5Pa, seal the reaction bottle, placed at 30 ° C for 10 hours; add 100 g of lactide to the reacted product, repeat vacuuming and nitrogen filling operations 6 times, and finally vacuumize to 5 Pa and seal the reaction bottle, continue to react for 36 hours, the reaction product After being dissolved and precipitated, it was filtered and dried to finally obtain an unsaturated polylactic acid block copolymer with a molecular weight of 73K g / mol and a molecular weight distribution of 1.92.

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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.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/78
Inventor 江盛鸿顾群黎俊刘吉蒋志强史佳鑫王静徐悦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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