Studies on compatibilization of natural rubber and ethylene propylene diene rubber and effect on their vulcanizate properties
1
Issued Date
2024
Copyright Date
1993
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
xiii, 134 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, 1993
Suggested Citation
Arisara Visetsillapanont Studies on compatibilization of natural rubber and ethylene propylene diene rubber and effect on their vulcanizate properties. Thesis (M.Sc. (Polymer Science))--Mahidol University, 1993. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/100916
Title
Studies on compatibilization of natural rubber and ethylene propylene diene rubber and effect on their vulcanizate properties
Alternative Title(s)
การศึกษาการผสมเข้ากันของยางธรรมชาติและยางเอทธิลีน โปรปิลีนและผลที่มีต่อสมบัติของยางวัลคาไนซ์
Author(s)
Advisor(s)
Abstract
The compatibility between natural rubber (NR) and Ethylene Propylene Diene Rubber (EPDM) was investigated in order to improve ozone resistance and mechanical properties of NR/EPDM blends by utilization of liquid rubbers and homogenizing agents. The first part of this work deals with finding the optimum vulcanizing system by varying types and amount of various accelerators. Proper cure characteristics and tensile properties of the rubber vulcanizates were used to determine the most suitable accelerators. 70/30 and 80/20 parts by weight were used in the study. The results indicated that BBS (N-t-Butylbenzothiazole-2sulfenamide) was the most appropriate accelerator for this study. In the second part, the composition optimization of NR/EPDM was investigated for further study. The ozone resistance property of the blend vulcanizates was used as a criteria to find the most suitable composition of rubber blends for further study investigation of the effect of compatibilizer. The results showed that composition of NR/EPDM at 70/30 and 80/20 by weight should be chosen. The reasons are that 70/30 NR/EPDM 70/30 can resist to ozone cracking longer than 5 days while 80/20 NR/EPDM failed within 24 hours under the same condition. In the third part, the ozone resistance and the mechanical properties of blend vulcanizates were measured. Homogenizing agents (Struktol 40 MS, Rhenosin 145), liquid EPDM, natural rubbers (LEPDM, LNR) and their combination were added to the blends and their effects on vulcanizates properties were investigated. LNR was prepared by chemical treatment of NR. LNR and LEPDM were partially crosslinked by sulfur vulcanization before mixing with NR and EPDM. The results showed that LEPDM could improve ozone resistance and some physical properties of the blends. Utilization of the combination of LNR and LEPDM, as partially crosslinked and uncrosslinked mixture 3 phr gave slight improvement of tensile properties but no improvement in ozone resistance has been observed of 70/30 NR/EPDM rubber blend except the plasticizing effect. Slight improvement of physical properties of the blends were also observed by addition of Struktol 40 MS. The energy of mixing of rubber blends were also studied since the change of mixing torque with time revealed the miscibility of the blends.
Description
Polymer Science (Mahidol University 1993)
Degree Name
Master of Science
Degree Level
Master's degree
Degree Department
Faculty of Science
Degree Discipline
Polymer Science
Degree Grantor(s)
Mahidol University