Method for preparing polymethacrylates in high glass-transition temperature

A technology of polymethacrylic acid and transition temperature, which is applied in the field of preparation of polymethacrylates with high glass transition temperature, can solve the problems of low solid content of the product and no industrial significance, etc. The method is simple and direct, and the raw materials are convenient Easy to get, cheap results

Inactive Publication Date: 2005-01-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polymethacrylates with higher Tg can also be prepared by ordinary microemulsion polymerization method, the solid content of the resulting product is extremely low, which is also of no industrial significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: 1.0 g of EMA was dropped into a colloidal solution composed of 1.4 g of SDS, 0.2 g of n-Pt and 40 g of deionized water to form a uniform and transparent pre-microemulsion. Stir the pre-microemulsion and raise the temperature to 70° C., pass nitrogen through the system for 5 minutes to remove oxygen, and then add 2 g of an aqueous solution containing 0.1 g of APS to the system to initiate the polymerization of the system. After being stable for about 5 minutes, the microemulsion gradually changed from colorless and transparent to very light transparent blue, indicating that the initiation has begun. At this time, 5g of EMA was dropped into the polymerization system drop by drop, and maintained at 70 ° C and N 2 atmosphere. After the monomer is dropped, continue to react at 70° C. for 2 hours to ensure that the monomer is completely reacted, and the reaction is terminated, and the product is a light blue transparent liquid. The Tg of the reaction product obtai...

Embodiment 2

[0034] Embodiment 2: 1.0g MMA is dropped into the colloidal solution that 1.5g CTAB and 40g deionized water form, form uniform and transparent premicroemulsion. Stir the pre-microemulsion and raise the temperature to 30°C, pass nitrogen through the system for 5 minutes to remove oxygen, and then add 2 g of the aqueous solution containing 0.04 g of Vc and H 2 o 2 Add 0.2g of the aqueous solution of 0.2g into the system, and the initiation system starts to polymerize. After about 5 minutes of stabilization, the microemulsion gradually changes from colorless and transparent to a very light transparent blue, indicating that the initiation has begun. At this time, 5g of MMA is dropped drop by drop into the In the polymerization system, maintain 30°C and N 2atmosphere. After the monomer is dropped, continue to react at 30° C. for 2 hours to ensure that the monomer is completely reacted, and the reaction is completed, and the product is a light blue transparent liquid. The Tg of t...

Embodiment 3

[0035] Embodiment 3: 12.0g MMA is dropped into the colloidal solution that 8.4g SDS, 1.2g n-amyl alcohol and 446.4g deionized water form, form uniform and transparent pre-microemulsion. Stir the pre-microemulsion and raise the temperature to 40°C, pass nitrogen through the system for 5 minutes to remove oxygen, then dissolve 0.1394g of TMEDA and 0.2736g of APS in 30g of deionized water and add them to the pre-microemulsion to initiate the polymerization of the system. After being stable for 10 minutes, the microemulsion gradually turned from colorless and transparent to very light transparent blue, indicating that the initiation had begun. At this time, 72.0 g of MMA was added to the system at a constant rate within 150 min, and maintained at 40 ° C and N 2 atmosphere. After the monomer is dripped, continue to react at 40°C to ensure that the monomer is completely reacted, and the reaction ends, and the product is a light blue transparent liquid. The Tg of the obtained reacti...

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Abstract

The invention relates to a preparation method of polymethacrylate with high glass-transition temperature (Tg). The existent method for raising Tg of said class of products has the defect of that at the same time of raising Tg the physical mechanical property of said product is reduced, and its preparation is difficult. Said invented method utilizes the improved microemulsion polymerization to synthesize polymethacrylate product in thermal initiation or oxidation reduction initiation system, and said product has high Tg. As compared with existent said class of products its Tg can be raised by 10-30 deg.C, and the product obtain after microemulsion polymerization is a transparent nano-grade microemulsion, so that the application range of said class of products can be greatly broadened.

Description

technical field [0001] The invention is a method for synthesizing polymethacrylates with a high glass transition temperature (Tg) in a microemulsion polymerization system. Background technique [0002] Polymethacrylates are widely used in industrial production, and the application of polymethylmethacrylate will be described below as an example. [0003] Polymethyl methacrylate (PMMA, commonly known as plexiglass), is an important thermoplastic that was developed earlier. It has good transparency, chemical stability and weather resistance, easy to dye, easy to process, and beautiful appearance. Its transparent The light rate is more than 10% higher than that of ordinary glass, and it is light and tough. In addition, it also has certain physical and mechanical properties, such as high mechanical strength, stable dimensions under certain conditions, and is easy to form and process, and can also perform secondary processing such as filing and cutting. PMMA has been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F4/40C08F120/14
Inventor 唐瑞庭薛垠杨武利府寿宽
Owner FUDAN UNIV
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