Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for grafting polymer in double bond position of natural rubber by adopting atom transfer radical polymerization (ATRP)

A technology for grafting polymer and natural rubber, which is applied in the field of grafting polymers at the double bond position of natural rubber, can solve the problems of branching, uncontrollable molecular weight, inability to control the length of the grafted chain and the uniformity of length, etc. The effect of simplicity, improved performance and product consistency

Inactive Publication Date: 2011-08-31
HAINAN UNIVERSITY
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graft copolymerization by free radical polymerization has the following disadvantages: 1. In addition to initiating NR to generate NR free radicals, free radicals also cause monomers to generate polymer free radicals. NR radicals combine to form grafted chains, or form monomeric homopolymers through chain transfer and chain termination, which will lead to low grafting efficiency of polymers and even the formation of "homopolymer domains"
2. The characteristics of free radical polymerization, such as slow initiation, fast growth, and easy chain termination and chain transfer, make the polymerization reaction difficult to control, resulting in a wide distribution of polymerization products, uncontrollable molecular weight, and sometimes even branching and cross-linking.
Therefore, when the graft copolymerization of NR is carried out by free radical polymerization, the distribution of the grafted chain on the NR molecular chain and the length and uniformity of the grafted chain cannot be controlled, and it is easy to form crosslinks, which will inevitably affect the grafting of NR. The properties of branch copolymers, resulting in poor product consistency

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
  • Method for grafting polymer in double bond position of natural rubber by adopting atom transfer radical polymerization (ATRP)
  • Method for grafting polymer in double bond position of natural rubber by adopting atom transfer radical polymerization (ATRP)
  • Method for grafting polymer in double bond position of natural rubber by adopting atom transfer radical polymerization (ATRP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 1g38.6% ENR (degree of epoxidation = 38.6%) and fully dissolve it in 10mL of dichloromethane, mix with 0.869g 2-bromoisobutyric acid (BIBA) and 0.0437g 2-bromoisobutyric acid tetra Methylammonium salts were added together into a Schlenk flask equipped with magnetic stirring, and placed in an oil bath at 60°C for 24 h under nitrogen protection. After the reaction, the product was precipitated with excess methanol, and the Methanol was repeatedly dissolved-precipitated, and the precipitate was vacuum-dried at 35°C to constant weight. The resulting macromolecular initiator BIBA-NR was 1 H-NMR analysis, measured halogen atom loading T t = 20.3%.

[0029](2) Add 1gBIBA-NR together with 0.269gCuBr, 0.325gN, N, N', N", N"-pentamethyldiethylenetriamine (PMDETA) into a Schlenk flask equipped with magnetic stirring, and use The reaction flask was tightly sealed with a rubber septum, degassed under vacuum and filled with argon. Then 20 ml of toluene and 10 g of methyl...

Embodiment 2

[0031] (1) Dilute 38.6% ENR latex to a dry content of 5%, and 2 CO 3 Adjust the pH to 8. Add 20g of ENR latex, 2.296g of p-carboxybenzenesulfonyl chloride (CSBA) and 0.0437g of NaOH into a Schlenk flask equipped with magnetic stirring, and react in an oil bath at 30°C under nitrogen protection After 24 hours of reaction, the product was precipitated with excess methanol, washed repeatedly with distilled water and methanol, and the residue was vacuum-dried at 35°C until constant weight. Gained macromolecular initiator CSBA-NR via 1 H-NMR analysis, measured halogen atom loading T t = 27.2%.

[0032] (2) Add 1gCSBA-NR together with 0.201gCuCl, 0.351gN, N, N', N", N"-pentamethyldiethylenetriamine (PMDETA) into a Schlenk flask equipped with magnetic stirring, and use The reaction flask was tightly sealed with a rubber septum, degassed under vacuum and filled with argon. Then 20 ml of toluene and 10 g of methyl methacrylate (MMA) were introduced through a syringe, and placed in...

Embodiment 3

[0034] (1) Dilute 38.6% ENR latex to a dry content of 5%, and 2 CO 3 Adjust the pH to 8. Add 20 g of ENR latex together with 2.238 g of p-bromomethylbenzoic acid (BPTA) and 0.0437 g of NaOH into a Schlenk flask equipped with magnetic stirring, and place it in an oil bath at 30 °C under nitrogen protection After 48 hours of reaction, the macroinitiator BPTA-NR emulsion was obtained after the reaction. Part of the product was precipitated with excess methanol, and washed repeatedly with distilled water and methanol, and the residue was vacuum-dried at 35°C to constant weight. The obtained BPTA-NR was used for 1 H-NMR analysis, measured halogen atom loading T t = 23.9%.

[0035] (2) Inject 10 g of styrene (St) directly into the obtained BPTA-NR emulsion, tightly seal the Schlenk flask with a rubber septum, degas and fill it with argon under vacuum, then add 0.178 g CuBr, 0.508 g 4,4 '-bis(penta-nonyl)-2,2'-bipyridine (dNbpy), placed in an oil bath at 60°C for reaction. After...

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 belongs to the technical field of the modification of natural rubber and particularly relates to a method for grafting polymer in the double bond position of natural rubber by adopting the atom transfer radical polymerization (ATRP). The method comprises the following steps: partially epoxidized natural rubber reacts with halogenated nucleophilic reagent, a side group with active halogen atom is introduced to the double bond position of the natural rubber molecular chain to obtain an ATRP macromolecular initiator, a polymer chain is grafted through ATRP to prepare natural rubber (NR) graft copolymer. The technology in the invention is simple; by controlling the action conditions, the positions of the grafted chains of the NR graft copolymer on the main chain and the density, length and length uniformity of the grafted chain can be effectively controlled; and the grafted chains are distributed in double bond position of the NR molecular chain, thus the performances of the NR graft copolymer and the uniformity of the product can be increased.

Description

technical field [0001] The invention belongs to the technical field of natural rubber modification, and in particular relates to a method for grafting polymers at double bond positions of natural rubber by atom transfer radical polymerization (ATRP). Background technique [0002] Modification of natural rubber (NR) by polymer grafting can not only improve the performance of NR itself, but also use the graft copolymer as a reinforcing agent and compatibilizer, and can also increase the impact strength and interface of polymer blend materials. Adhesion. [0003] At present, the polymer grafting modification of NR is mainly through the free radical polymerization method, forming allyl radicals and alkyl radicals on the α-active hydrogen and double bond positions of the NR molecular chain as grafting active points, initiating The second monomer undergoes graft copolymerization. Most of the polymer graft chains are distributed on the α-active hydrogen position of NR, and a smal...

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
IPC IPC(8): C08F253/00
Inventor 廖建和陈永平廖禄生赵艳芳廖双泉杨耀华
Owner HAINAN UNIVERSITY
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com