Effect of non-rubber constituents on vulcanisation behaviour and properties of natural rubber vulcanisates
10
Issued Date
2024
Copyright Date
1991
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
xi, 82 leaves : ill.
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Mahidol University
Bibliographic Citation
Thesis (M.Sc. (Polymer Science))--Mahidol University, 1991
Suggested Citation
La-oongtip Srichantamit Effect of non-rubber constituents on vulcanisation behaviour and properties of natural rubber vulcanisates. Thesis (M.Sc. (Polymer Science))--Mahidol University, 1991. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/100791
Title
Effect of non-rubber constituents on vulcanisation behaviour and properties of natural rubber vulcanisates
Alternative Title(s)
อิทธิพลของส่วนประกอบที่ไม่ใช่ยางที่มีต่อสมบัติการวัลคาไนซ์และสมบัติของยางธรรมชาติที่วัลคาไนซ์แล้ว
Author(s)
Advisor(s)
Abstract
The objective of the present studies is to make further contribution to the knowledge of the effects of the non-rubber substances on the cure behavior, structures and propeties of natural rubber vulcanisates, with the view to reduce inconsistency of natural rubber. Five types of NR samples were prepared for this study, viz acid coagulate NR (ANR), whole NR (WNR) acetone-extrocted NR (ENR), deproteinised NR (DPNR and purified NR (PNR). The results showed that ANR sample showed the largest variations in cure behavior, while WNR and PNR samples exhibited relatively consistent vulcanisation properties. The results confirmed that non-rubber compounds have accelerating effect on vulcanisation reactions of NR. Therefore, exact control of the amount of these non-rubbers in the NR sample must be exercised if variation in the cure behaviour of NR is to be reduced. Complete removal of the non-rubbers (purified NR sample) or leaving them intact (whole NR sample) might provide alternative means for solving the inconsistency problem of NR. Study on the effects of non-rubbers on the network structures of NR vulcanisates showed that non-rubber compounds although had obvious influences on the cure time of NR, have no effect on the types and amounts of crosslinks farmed in the CV Vulconisate system cured by using CBS as accelerators. Thus the physical propreties were essentially unchanged. However, for the EV system, the absence of non-rubbers caused uniform distribution of mono-, di-, polysulphidic crosslinks. Although strength properties of these rubber vulconisates remained largely unchanged, the spread out of crosslink type resulted in improvement of flex-cracking properties observed for DPNR and PNR.
Description
Polymer Science (Mahidol University 1991)
Degree Name
Master of Science
Degree Level
Master's degree
Degree Department
Faculty of Science
Degree Discipline
Polymer Science
Degree Grantor(s)
Mahidol University