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Catalyst for ring-opening polymerization of cyclic ester and preparation method thereof
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A ring-opening polymerization, catalyst technology, applied in the field of cyclic ester ring-opening polymerization catalyst and its preparation
Active Publication Date: 2004-11-10
长春宸泰科技有限公司
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These traditional catalysts are not selective for different configurations of lactide and when used to polymerize racemic lactide, only amorphous polymers are obtained
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Embodiment 1
[0027] Embodiment 1: Catalyst Salmpen ( t Synthesis of Bu)AlEt,
[0028] Under the protection condition of stirring and inert gas, put 4ml of Schiff's base Salmpen ( t Bu)H 2 Toluene solution (1mol / L) and 4ml of AlEt 3 Toluene solution (1mol / L) is mixed, temperature control 80 ℃, stirs 48 hours, then cools down, vacuumizes and removes volatile matter, obtains product Salmpen ( t Bu)AlEt 2.24g, yield 95.1%. Elemental analysis results,
[0029] Calculated: C, 75.47; H, 9.76; N, 4.76; Found: C, 75.52; H, 9.59; N, 4.88.
Embodiment 2
[0030] Embodiment 2: Catalyst Salmpen ( t Bu)AlO i Synthesis of Pr
[0031] In addition to the AlEt in Example 1 3 Change aluminum isopropoxide into, and temperature of reaction changes outside 120 ℃, and other steps are identical with example 1, obtain product Salmpen ( t Bu)AlO i Pr 2.31g, yield 93.3%. Elemental analysis results, calculated value: C, 73.75; H, 9.61; N, 4.53; found value: C, 73.98; H, 9.87; N, 4.16.
Embodiment 3
[0032] Embodiment 3: Catalyst Salepen ( t Synthesis of Bu)AlEt
[0033] In addition to changing the Schiff base in Example 1 into Salepen ( t Bu)H 2 , the temperature of reaction is changed to 50 ℃, and other steps are identical with example 1, obtain product Salepen ( t Bu)AlEt 2.38g, yield 96.5%. Elemental analysis results, calculated value: C, 75.93; H, 9.97; N, 4.54; found value: C, 75.97; H, 10.21; N, 4.66.
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Abstract
The invention relates to a category of cyclic ester open loop polymerization catalyst and method for preparation, it also relates to the process for polymerizing racemic lactide by using these catalysts, wherein the catalysts are the product of the reaction between Schiff's base and aluminium triethide or aluminium isopropoxide, they exhibit stereoselectivity to the polymerization of racemic lactide, thus crystallinitypolylactic acid can be obtained through polymerizing racemic lactide.
Description
technical field [0001] The invention relates to a catalyst for ring-opening polymerization of cyclic esters, a preparation method thereof, and a method for stereoselectively polymerizing racemic lactide using the catalyst. technical background [0002] From an environmental protection point of view, polymers are required to be biodegradable in order to reduce waste disposal and pollution. Polylactic acid is a biocompatible and biodegradable polymer material. Compared with polyolefin, it has incomparably excellent characteristics in terms of environmental protection. At the same time, in the medical field, polylactic acid is more and more widely used, for example: it can be used as sutures, bone nails, bone rods, and drugcontrolled release carriers. [0003] Polylactic acid is generally obtained by ring-opening polymerization of lactide, and there have been a large number of patents and scientific documents disclosing the preparation of polylactic acid by ring-opening polym...
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