Naslov
Change of Network Structure of Natural Rubber Vulcanizate with Thermo Ageing

Autori
Hrnjak-Murgić, Zlata ; Jelenčić, Jasenka ; Bravar, Mladen

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XXth Colloquium of Danubian Countries / Tudos, Ferenc - Budimpešta : Hungarian Academy of Sciences (MTA), 1998

Skup
XXth Colloquium of Danubian Countries

Mjesto i datum
Budimpešta, Mađarska, 10.05.1998. - 13.05.1998

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Accelerators; Thermal Stability; Natural Rubber

Sažetak
Rubber network formation is known to be dependent on the nature of the crosslinking agent. In turn, crosslink density produced does decisively determine rubber physicochemical properties and service life. The amounts of sulphur accelerators added should be balanced accordingly to the expeced rates of sulphur donation reactions to double bonds of polyisporene elastomer. Three systems of accelerations were applied to natural rubber, NR vulcanisations. First, zinc diethylditiocarbamate, ZDEC; second, zinc mercaptobenzothiazole, ZMBT; and a third, i.e. the combination of ZMBT and diphenylguanidin, DPG. Thermo-oxidative ageing in hot air was carried out afterwards and the crosslink-density determinations of the agend samples were studied. Two methods were used, stress-strain measurements as well as equilibrium swelling. Thiazole accelerator was found to produce vulcanised rubber that differs at ageing in the way that not only the processes involving sulphur-crossling moieties chemistry but also polymer main-chain scission phenomena that are supposed to be present.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA