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Method for preparing macromolecular weight branched polycaprolactone

A technology of polycaprolactone and high molecular weight, applied in the field of preparing branched polycaprolactone, which can solve the problems of difficult control, complex reaction and high cost

Inactive Publication Date: 2004-09-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have the disadvantages of high cost, complex reaction and difficult control.

Method used

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  • Method for preparing macromolecular weight branched polycaprolactone
  • Method for preparing macromolecular weight branched polycaprolactone
  • Method for preparing macromolecular weight branched polycaprolactone

Examples

Experimental program
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Effect test

example 1

[0029] Add 2.0g of EVOH with 44% ethylene content into a 100ml reactor, evacuate and fill nitrogen three times repeatedly, then add 20ml ε-caprolactone, put it in an oil bath at 150°C, and after one hour, all EVOH dissolves into ε-caprolactone lactone, then lower the temperature to 110°C and add Sn(Oct) 2 0.020g, reacted for 20 hours. Dissolve in chloroform and precipitate into cold heptane. The molecular weight of the product is 123260; the conversion rate is 73.71%; the viscosity measured by Ubbelohde's viscometer is 0.48dL / g; the melting temperature of the obtained polymer measured by DSC is 36.4°C, and the crystallization temperature is 3.10°C.

example 2

[0031] The condition is the same as example 1, but the initiator is changed into EVOH with an ethylene content of 32%, and the reaction time is 48 hours. The molecular weight of the product is 146880; the conversion rate is 81.99%; the viscosity measured by Ubbelohde's viscometer is 0.61dL / g; the melting temperature of the obtained polymer measured by DSC is 41.7°C, and the crystallization temperature is 8.02°C.

example 3

[0033] Condition is the same as example 1, but changing initiator into EVOH with ethylene content of 27%, the molecular weight of product is 168470; Transformation efficiency is 85.67%; Its viscosity measured by Ubbelohde's viscometer is 0.67dL / g; Measure gained with DSC The melting temperature of the polymer was 39.4°C and the crystallization temperature was 5.4°C.

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Abstract

The present invention relates to a method for preparing branched polycaprolactone (PCL) by using polyethylene-co-vinyl alcohol (EVOH) as initating agent and using epsilon-caprolactone (epsilon-CL) as monomer. This invention utilizes the hydroxyl group on the chain of EVOH to initiate ring-opening polymerization of epsilon-caprolactont to obtain the branched PCL which is friendly to environment. If the Sn(Oct)2 is added as coinitiating agent, its reaction rate also can be raised, and the branched polycaprolactone with higher molecular weight can be prepared. By controlling the quantity of epsilon-caprolactone and EVOH with different ethylene content, the polymers with different molecular weights and different branching degree can be prepared.

Description

technical field [0001] The invention relates to a method for preparing branched polycaprolactone by using poly(ethylene-co-vinyl alcohol) (EVOH) as an initiator and ε-caprolactone (ε-CL) as a monomer. Polycaprolactone is a degradable polymer material, which has high application value in medical treatment and can be used as artificial bone, scaffold, plaster, etc. Background technique [0002] With the development of industry, white garbage can be seen everywhere, seriously destroying the ecological balance, so it is necessary to use degradable plastics. Polycaprolactone is a biodegradable plastic that degrades when buried in the soil over time. At present, there are many methods for synthesizing polycaprolactone, and various initiators can initiate its ring-opening polymerization, and hydroxyl group is one of them. Eui-Jun Choi, Chang-Hyeon Kim, and Jung-Ki Park once proposed to use starch and water to co-initiate ε-caprolactone to prepare branched copolymers (Macromolecul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/82
Inventor 何军坡姜洪进杨玉良
Owner FUDAN UNIV