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Zinc complex catalyst for preparing polylactic acid by ring-opening polymerization and preparation method thereof

A zinc complex, ring-opening polymerization technology, applied in the direction of zinc organic compounds, can solve the problems of narrow distribution and high molecular weight, and achieve the effects of convenient operation, good reproducibility and high yield

Active Publication Date: 2019-11-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is currently difficult to find a suitable organic ligand coordinated with zinc ions to efficiently catalyze the ring-opening polymerization of lactide, while taking into account the characteristics of high molecular weight and narrow distribution.

Method used

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  • Zinc complex catalyst for preparing polylactic acid by ring-opening polymerization and preparation method thereof
  • Zinc complex catalyst for preparing polylactic acid by ring-opening polymerization and preparation method thereof
  • Zinc complex catalyst for preparing polylactic acid by ring-opening polymerization and preparation method thereof

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Experimental program
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experiment example 1

[0019] The preparation of experimental example 1 zinc complex:

[0020] 59.4 mg (0.2 mmol) of zinc nitrate hexahydrate, 24.0 mg (0.1 mmol) of bis(1,2,4-triazole-1-methyl)benzene and 43.2 mg (0.20 mmol) of 1,4- Naphthalene dicarboxylic acid, 22.4 mg (0.4 mmol) potassium hydroxide and 7 milliliters of deionized water were successively added to a 15 milliliter polytetrafluoroethylene-lined stainless steel autoclave to seal, heated to 180 ° C, kept at a constant temperature for 72 hours, and then After cooling down to room temperature at a rate of 5°C per hour, a pale yellow block crystal suitable for X-ray single crystal diffraction was obtained, which was then washed with acetone and methanol successively, and dried to obtain a zinc complex with a yield of 73% (63.3 mg , based on bis(1,2,4-triazole-1-methyl)benzene).

[0021] The main infrared absorption peak is (KBr / cm –1 ): 3644w, 3571w, 3447w, 3137w, 3123w, 3102w, 1618s, 1590m, 1570m, 1531m, 1510m, 1454m, 1361s, 1281m, 1259...

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Abstract

The invention discloses a zinc complex catalyst used for preparation of polylactic acid by ring-opening polymerization and a preparation method thereof, and relates to the field of polylactic acid catalysts. The zinc complex catalyst has a chemical formula of [Zn5(btb)2(1,4-NDC)4([mu]3-OH)2], wherein btb is a di(1,2,4-triazole-1-methyl)benzene ligand; 1,4-NDC is a 1,4-naphthalic acid anion; and [mu]3-OH is hydroxyl bridging. The synthetic method provided by the invention has high yield and good reproducibility; and the crystal obtained by using the method provided by the invention has high purity and good thermal stability. The zinc complex has good catalytic activity to catalyze ring-opening polymerization of lactide; and the polylactic acid prepared in the invention has a weight average molecular weight of 30 thousand or more, and can be applied in the field of medical polymer materials.

Description

technical field [0001] The invention relates to the field of polylactic acid catalysts, in particular to a zinc complex, a preparation method thereof, and an application for catalyzing lactide bulk ring-opening polymerization. Background technique [0002] Polylactic acid (PLA, also known as polylactide), is a light yellow or transparent aliphatic polyester polymer material with a density of about 1.25g / cm 3 , non-irritating, is obtained by artificial chemical synthesis of lactic acid produced by biological fermentation. PLA has good biocompatibility and biodegradability. In the natural environment, it can be finally degraded into carbon dioxide and water under the action of microorganisms or enzymes to realize the cycle in nature. It is an ideal green polymer material. Various films, sheets and fiber products prepared from PLA are widely used in the fields of clothing, textiles, packaging, agriculture, forestry, civil engineering, medical and sanitary products and daily ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/83C08G63/08C07F3/06
CPCC07F3/06C08G63/08C08G63/823
Inventor 陈圣春张飞杭田锋崔爱军何明阳陈群
Owner CHANGZHOU UNIV