Studies on novel binary accelerator system in sulfur vulcanization of natural rubber

Citation
Ap. Susamma et al., Studies on novel binary accelerator system in sulfur vulcanization of natural rubber, J APPL POLY, 79(1), 2001, pp. 1-8
Citations number
13
Categorie Soggetti
Organic Chemistry/Polymer Science","Material Science & Engineering
Journal title
JOURNAL OF APPLIED POLYMER SCIENCE
ISSN journal
00218995 → ACNP
Volume
79
Issue
1
Year of publication
2001
Pages
1 - 8
Database
ISI
SICI code
0021-8995(20010103)79:1<1:SONBAS>2.0.ZU;2-T
Abstract
The synergistic activity of binary accelerator systems in rubber vulcanizat ion is well known. Thiourea and its derivatives are important secondary acc elerators in this context. It is suggested that thiourea containing binary systems of rubber vulcanization proceed by a nucleophilic reaction mechanis m. Amidinothioureas (ATUs), which are derivatives of thiourea, have been in vestigated extensively as secondary accelerators. One of the aims of this s tudy was to get further proof with regard to the theory of the nucleophilic reaction mechanism in such binary systems. In the present study phenyl sub stituted ATU was used as a secondary accelerator along with mercaptobenzoth izyl disulfide, tetramethyl thiuram disulfide, or cyclohexyl benzthiazyl su lfenamide in the sulfur vulcanization of natural rubber. The results showed an appreciable reduction in the cure time for the mixes containing the ATU compared to the reference mixes. These results are indicative of a nucleop hilic reaction mechanism in the vulcanization reaction under review. These vulcanizates also showed comparatively better tensile properties and good r etention of these properties after aging. The optimum dosages of the second ary accelerator required for these vulcanization reactions were also derive d. (C) 2000 John Wiley & Sons, Inc.