A study of sulfur bridges in filled natural rubber vulcanizates by pyrolysis gas chromatography with flame‐photometric detection

Abstract

SynopsisNatural rubber vulcanizates of two formulations, with sulfurlN-cyclohexyl-2-benzothiazolesulfenamide (CBS) and tetramethylthiuram disulfide (TMTD), respectively, were analyzed by pyrolysis gas chromatography. A sulfur-selective flame-photometric detector was utilized. The main pyrolysis products were identified as CS2 and some thiophenes. The yields of the pyrolysis products from the two types of rubber were very different. The yields also varied with the curing time of the rubbers.

Transformation of vulcanized natural rubber into lower molecular weight polymers and their application to grafted copolymer synthesis with some vinyl monomers

“…Present disposal of waste vulcanized natural rubber is limited to simple incineration, thermal decomposition, [1][2][3][4][5][6] oil recovery, [7][8][9][10][11][12][13][14] and material recycle. [15][16][17][18][19] However, recent requirement on saving fossil fuel and decreasing the greenhouse effect require new environmentally-benign solutions, such as chemical recycling.…”

A Study of the Sulphur Bridge Structure in EPDM Rubber Vulcanisates by Pyrolysis-Gas Chromatography

“…Rubber vulcanisates in general are insoluble in solvents and the carbon black and other compounding agents used interfere with analysis. Pyrolysis gas chromatography (Py-GC), free from the constraints of sample form, is therefore a fast, straightforward and effective method of investigation, and a number of examples of the structural analysis of natural rubber by Py-GC have been reported [8][9][10].…”