Study of the preparation of chlorinated natural rubber for industrial production
1
Issued Date
1989
Copyright Date
1989
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
105 leaves : ill.
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Mahidol University
Bibliographic Citation
Thesis (M.Sc. (Physical Chemistry))--Mahidol University, 1989
Suggested Citation
Montree Lerdphatphaisan Study of the preparation of chlorinated natural rubber for industrial production. Thesis (M.Sc. (Physical Chemistry))--Mahidol University, 1989. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/103313
Title
Study of the preparation of chlorinated natural rubber for industrial production
Author(s)
Advisor(s)
Abstract
Studies were made on the chlorination of various types of natural rubber (NR) by different methods, in order to evaluate the possibility of developing the production of commercial chlorinated natural rubber (CNR). Two methods of chlorination were studied, viz. chlorination in rubber solution and in latex. The types of NR evaluated as possible sources of starting raw materials for the production of CNR included commercial smoked sheet, scraped rubber and purified NR, partial or wholly. Attention was given to the effects of nonrubber constituents (mainly protein and lipids) of NR on chlorination reaction and the resulting products. The studies showed that chlorination in NR latex is not a suitable method for commercial preparation of CNR as it yields products having low chlorine content (30-40% by weight) and unacceptable thermal stability. Chlorination in rubber solution, using carbontetrachloride as solvent, the reaction temperature of 78 degree and the reaction time between 21 - 24 house, on the other hand gives CNR having comparable properties to those of commercial CNR in most respects. The chlorine contents reached were 63 - 65% by weight, depending on the types of starting NR. Nonrubber constituents of NR appear to have little effects on the final properties of CNR, except for thermal stability where their presence impart an improvement, but retards the rate of chlorination during the initial stage of the reactions. Thus, it appears that all types of NR studied, except scrapped rubber, may be used as starting materials for the preparation of CNR. Preliminary study was also made to chlorinate liquid NR (molecular weight 6,000 - 7,000), in order to extend the potential source of raw materials for CNR production. The results attained showed that chlorination of this type of material is possible but only when they are thoroughly purified. No significant chlorination was observed to take place with unpurified liquid NR. The product, however, ratain the soft and ductile characteristics of low molecular weight polymers.
Description
Physical Chemistry (Mahidol University 1989)
Degree Name
Master of Science
Degree Level
Master's degree
Degree Department
Faculty of Science
Degree Discipline
Physical Chemistry
Degree Grantor(s)
Mahidol University