Reference

Studies on the characteristics of rubber vulcanization exotherm by differential scanning calorimetry

Studies on the characteristics of rubber vulcanization exotherm by differential scanning calorimetry. Choi, Sei Young; Paik, Nam Chul (Grad. Sch., Kyung Hee Univ., Seoul, S. Korea). Komu Hakhoechi, 19(1), 13-31 (Korean) 1984. CODEN: KHAKDO. ISSN: 0253-3138. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The feasibility of DSC anal. in quality control of the S vulcanization of natural and nitrile rubbers was studied by measuring vulcanization exotherms in the presence of TMTD [137-26-8], MBTS [120-78-5], 1,3-diphenylguanidine (I) [102-06-7], tetramethylthiuram monosulfide (II) [137-26-8], CBS [95-33-0], and 2-mercaptobenzothiazole [149-30-4] as accelerators at various heating rates and scanning temp. and by comparing the DSC results with the data obtained by an oscillating disk rheometer (ODR). In dynamic DSC scanning, the exotherm increased with increasing heating rate (2-20°/min) and decreased with increasing heating rate (30-50°/min). TMTD and II gave sharper and higher exotherms than others, while I acted as a delayed acting accelerator. Both the DSC and ODR methods gave comparable temp. decrease of the vulcanization rate and conversion.

Environmental effects on degradation of elastomer

Environmental effects on degradation of elastomer. Kawasaki, Hitoshi; Kusano, Fumio; Kodama, Soji; Nakatsuka, Takuo; Itadani, Katsuhiko (Okayama Prefect. Ind. Tech. Cent., Okayama, Japan). Okayama-ken Kogyo Gijutsu Senta Hokoku, (9), 33-46 (Japanese) 1983. CODEN: OKSHDY. ISSN: 0386-149X. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) The weatherability of natural and butadiene-styrene rubbers were studied. The heat deterioration at >100° of elastomer filled with carbon black was higher than that of elastomer filled with white fillers. EPR rubber easily deteriorated by UV light. The weatherability of diene elastomers was improved by addn. of 330% EPR. Mixts. of 1 parts N-cyclohexylbenzothiazylsulfenamide [95-33-0] and 0.5-1 parts diphenylguanidine [102-06-7] were effective vulcanization accelerators for diene elastomers. O3 aging of elastomers was prevented by addn. of wax-coated CaCO3.