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

Method for adjusting molecular weight of polymer

A polymer molecular weight technology, applied in the field of polymer molecular weight adjustment, to achieve the effect of mild reaction conditions and simple and easy methods

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above several methods can play the role of regulating the molecular weight of high molecular polymers, they are all limited to adjusting the molecular weight from the polymerization stage, and it is difficult to adjust the molecular weight of existing high molecular polymers according to requirements. Achieve the purpose of optimizing product structure and performance, and flexibly developing product grades

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 adjusting molecular weight of polymer
  • Method for adjusting molecular weight of polymer
  • Method for adjusting molecular weight of polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of catalyst

[0058] Under nitrogen protection, 760 mg of iodine, 848 mg of a compound represented by formula V (commercially purchased from Bailingwei Technology Co., Ltd.) and 20 mL of dichloromethane were added to a 100 mL three-necked flask, and stirred at room temperature (25°C) for 0.5 hours. The obtained mixture was separated by aluminum oxide column chromatography (the developing solvent was dichloromethane), and the obtained eluate was concentrated and washed with cyclohexane to obtain 1.31 g of a catalyst as a yellow solid. The obtained catalyst was subjected to H NMR spectroscopy ( 1 H-NMR) and carbon nuclear magnetic resonance ( 13 C-NMR) analysis, confirmed that the obtained catalyst has the structure shown in formula VI.

[0059] 1 H-NMR(400MHz,DMSO)δ(ppm):1.35-2.06(m,33H),1.81(s,18H),2.62(m,4H),6.11(d,1H),7.38-7.50(m,5H ),7.59-7.67(m,3H).

[0060] 13 C-NMR (100MHz, DMSO) δ (ppm): 24.8, 25.5, 26.2, 26.3, 26.4, 26.6, 31.9, 32.1, 129.1,...

Embodiment 2

[0067]5 g of butadiene-styrene copolymer (commercially purchased from Sinopec, brand Y031) was dissolved in 50 mL of toluene under nitrogen protection. After the dissolution was complete, 5 g of 1-decene was added thereto. After adding 15 mg of the catalyst prepared in step (1) of Example 1 to the reaction system, heat it to 100°C for reaction, react for 2 hours, stop the reaction, and dry under reduced pressure to remove the solvent. The molecular weights and molecular weight distributions of the polymers before and after the reaction are listed in Table 2.

[0068] Table 2

[0069]

Embodiment 3

[0071] The butadiene-styrene copolymer was treated in the same manner as in Example 2, except that the reaction was carried out at 40°C. The molecular weights and molecular weight distributions of the polymers before and after the reaction are listed in Table 3.

[0072] table 3

[0073]

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 method for adjusting the molecular weight of a polymer. The method is characterized in that a polymer contacts with a catalyst as a substrate under olefin metathesis reaction conditions, the polymer contains a carbon-carbon double bond, and the catalyst is a compound with the structure represented by formula I. The method can effectively adjust the molecular weight of existing polymers. Additionally, the method has the advantages of simplicity, easy implementation and mild reaction conditions.

Description

technical field [0001] The present invention relates to a method for adjusting the molecular weight of polymers. Background technique [0002] With the continuous development of material science, the application fields of polymers continue to expand. For polymer materials, the mechanical properties, processing rheological properties, mechanical properties, thermodynamic properties, etc. of the material are closely related to the molecular weight and molecular weight distribution. Molecular weight and molecular weight distribution, as important performance indicators of polymers, have always been concerned by chemists. However, as far as polymer polymerization is concerned, the control and adjustment of molecular weight are often restricted by the synthesis methods and reaction devices used. [0003] The methods for adjusting the molecular weight of high molecular polymers in the prior art mainly include: changing the catalyst system; using multiple reactors in series to ca...

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): C08F236/10C08F136/06C08F8/50
Inventor 毕海鹏邵明波关敏韩书亮曲亮靓
Owner CHINA PETROLEUM & CHEM CORP
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