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Method for modifying polylactic acid using superbranched polymer

A technology of hyperbranched polymer and polylactic acid, which is applied in the field of improving polylactic acid with hyperbranched polyester amide, can solve the problems that have not been seen before, and achieve the effects of reducing brittleness, reducing viscosity, improving mechanical properties and elongation at break

Inactive Publication Date: 2007-05-16
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are no research reports and patents about utilizing hyperbranched polymers as polylactic acid (PLA) modifiers.

Method used

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  • Method for modifying polylactic acid using superbranched polymer
  • Method for modifying polylactic acid using superbranched polymer
  • Method for modifying polylactic acid using superbranched polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Under a nitrogen atmosphere, add 6.190g of GA (0.054mol) and 6.460g of AEPO (0.054mol) to a 100ml reaction tube with two vents, put them in an oil bath preheated to 80°C, and mechanically stir vigorously to react After 2 hours, the temperature was raised to 120°C, and the stirring was continued for 45 hours. The viscosity of the system suddenly increased and it was difficult to stir. The temperature was lowered to about 80°C, and the vacuum was pumped for 2 hours. 10.69 g (85%) of hyperbranched poly(glutaric anhydride-dimethylolaminopropane) were obtained as a pale yellow transparent solid. The relative weight average molecular weight is 106.0 Kg / mol, the relative molecular weight distribution is 3.30, and the relative molecular weight distribution has a broad peak. pass 13 C~NMR spectrum analysis calculates that its branching degree is 0.42, DSC test does not exist melting and crystallization, the glass transition temperature is 7.2 ℃, and the temperature of thermal d...

Embodiment 2

[0032] Under a nitrogen atmosphere, add 5.590g of SA (0.056mol) and 6.66g of AEPO (0.056mol) to a 100ml reaction tube with two vents, put them in an oil bath preheated to 80°C, and mechanically stir vigorously to react After 2 hours, the temperature was raised to 130°C, and the stirring was continued for 45 hours. The viscosity of the system suddenly increased and it was difficult to stir. The temperature was lowered to about 80°C, and vacuum was applied for 2 hours. 10.77 g (88%) of hyperbranched poly(succinic anhydride-dimethylolaminopropane) were obtained as a pale yellow transparent solid. The relative weight average molecular weight is 70.3Kg / mol, the relative molecular weight distribution is 2.36, and the relative molecular weight distribution has a broad peak. pass 13 C~NMR spectrogram analysis calculates that its branching degree is 0.55, and there is no melting and crystallization in the sample by DSC test, the glass transition temperature is 34.1°C, and the temperat...

Embodiment 3

[0034]Under a nitrogen atmosphere, add 8.290g of DGA (0.071mol) and 8.510g of AEPO (0.071mol) to a 100ml reaction tube with two vents, put them in an oil bath preheated to 80°C, and mechanically stir vigorously to react After 2 hours, the temperature was raised to 110°C, and the stirring was continued for 18 hours. The viscosity of the system suddenly increased and it was difficult to stir. The temperature was lowered to about 80°C, and the vacuum was pumped for 3 hours. 15.18 g (90%) of hyperbranched poly(diethylene glycol anhydride-dimethylolaminopropane) was obtained as an orange-yellow transparent solid. The relative weight average molecular weight is 39.4Kg / mol, the relative molecular weight distribution is 2.60, and the relative molecular weight distribution has a broad peak. pass 13 C~NMR spectrogram analysis calculates that its branching degree is 0.47, and there is no melting and crystallization in the sample by DSC test, the glass transition temperature is 38.4°C, a...

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Abstract

The invention discloses a preparing method of modified polylactic acid through hyperbranched polymer, which is characterized by the following: blending 1.0-20% hyperbranched polymer and polylactic acid through fusing; polymerizing commercial acid anhydride and multi-alcohol amine to form hyperbranched polymer at original position with large scale of hydroxy on the end.

Description

technical field [0001] The invention relates to a method for modifying polylactic acid by adopting hyperbranched polymer, in particular to a method for improving polylactic acid by adopting hyperbranched polyester amide. technical background [0002] Hyperbranched polymer (Hyperbranched Polymer) is a kind of randomly branched polymer with a three-dimensional ellipsoidal structure. It is generally considered to be the fourth type of polymer material after linear, branched and crosslinked polymers. Its special three-dimensional structure makes them all have low solution and melt viscosity, good solubility and a large number of terminal functional groups available for modification. Compared with the stepwise and repeated synthesis method of protection and anti-protection of dendrimers, the one-step or quasi-one-step synthesis method of hyperbranched polymers is relatively easy, and the cost is significantly reduced, so it has more extensive industrial application value. This m...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/91C08G81/00
Inventor 李悦生林影董丽松董仲敏李彦国
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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