Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Synthesis method of bola-like polylactic acid with precise controlled molecular structure

A technology of molecular structure and synthesis method, applied in the field of material chemistry, can solve the problem of inability to determine the molecular structure of the product, and achieve the effects of single and stable product composition, few side reactions, and convenient and accurate regulation.

Inactive Publication Date: 2015-01-21
SICHUAN UNIV
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also cannot determine the molecular structure of the resulting product, which also has a wider molecular weight

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Synthesis method of bola-like polylactic acid with precise controlled molecular structure
  • Synthesis method of bola-like polylactic acid with precise controlled molecular structure
  • Synthesis method of bola-like polylactic acid with precise controlled molecular structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] In order to illustrate the technical scheme of the present invention in more detail, give an example as follows:

[0024] A method for synthesizing a bolus type polylactic acid with a precise and controllable molecular structure, comprising the steps of:

[0025] 1). Preparation of double anion active center

[0026] (1). Put sodium metal into a three-necked bottle equipped with toluene

[0027] (2). Stir under the condition of 0°C-40°C to form sodium powder, and add ethylene glycol dropwise through a separatory funnel to obtain disodium ethylene glycol. The reaction formula is as follows:

[0028] 2Na+HO-CH 2 -CH 2 -OH→NaO-CH 2 -CH 2 -ONa

[0029] (3). Concentrating and purifying the prepared disodium ethylene glycol.

[0030] 2). Preparation of polylactic acid linear chains with double-terminal polyhydroxyl groups

[0031] (1). Put disodium ethylene glycol into a three-necked bottle filled with toluene solution, stir for 10min-60min until uniform

[0032] (2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a synthesis path of a bola-like polylactic acid with a precise controlled molecular structure. The method comprises the following steps: 1, preparing a dianion activity center with trigger abilities on two ends; 2, triggering a linear long chain of which the molecular weight is controllable through the dianion activity center, wherein the main chain can be prepared through polymerization of monomers of any degradable polymer suitable for dry anionic polymerization, so that the flexibility of the main chain can be changed and can be used as a connection chain between 'bolas'; 3, carrying out aggregation blocking on active anions to obtain a macromonomer with a double-end polyfunctional group; and 4, carrying out ring opening polymerization on the macromonomer as an initiator and lactide under a proper condition, so as to obtain the bola-like polylactic acid with 'adjustable main chain molecular structures, controllable length and multi-branched double ends' and the precise controlled molecular structure.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a method for synthesizing a bolus type polylactic acid with controllable branch length. Background technique [0002] Polylactic acid is a widely used biodegradable material, and its good mechanical properties make it have a bright prospect in packaging materials and other fields. However, due to the poor melt strength of the polylactic acid material itself, it is prone to problems such as bubble rupture and low inflation ratio during film blowing and foaming. The preparation of polylactic acid with a certain branched structure as an additive in the processing of linear polylactic acid is a recognized and promising method. Among them, there is a method of coupling polylactic acid with different long-chain branched structures with difunctional isocyanate to prepare polylactic acid with complex branched structure and add it as an additive to linear polylacti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/08C08G63/78
Inventor 刘正英张书洋吴枫杨鸣波杨伟
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com