A novel system for measurement of types and densities of sulfur crosslinks of a filled rubber vulcanizate

作者：Choi Sung Seen^*; Kim Eunha

来源：Polymer Testing, 2015, 42: 62-68.

DOI：10.1016/j.polymertesting.2014.12.007

• Sulfur crosslink type
• Chemical probe
• Hexylamine
• Rubber vulcanizate
• Cubic apparent crosslink density

A novel system for measuring the crosslink densities of mono-, di- and polysulfides of a filled rubber vulcanizate was developed. The system included pre-swelling, cleavage of sulfur crosslinks by a chemical probe using thiol/n-hexylamine instead of thiol/piperidine, and two step swelling. A sample cage made of stainless steel mesh was used to measure multiple samples at the same time and to reduce experimental errors. The organic materials-extracted sample was pre-swollen in toluene to introduce the probe chemicals more rapidly and homogeneously into the whole network. Polysulfidic crosslinkages were cleaved by a chemical probe of propane-2-thiol/n-hexylamine in toluene, while di- and polysulfidic crosslinkages were dissociated by a chemical probe of n-hexanethiol/n-hexylamine in toluene. The experimental errors were lower than 2%. By using cubic apparent crosslink density, fractions of the crosslink types of an unknown rubber vulcanizate could be estimated even although the filler content and rubber composition are not analyzed.

• 出版日期2015-4