Naslov
The kinetic parameters for the evaporation of plasticizers from plasticized poli(vinyl chloride)

Autori
Kovačić, Tonka ; Mrklić, Željko

Izvornik
Thermochimica Acta (0040-6031) 381 (2002), 1; 49-60

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
kinetic parameters; plasticizers; poly(vinyl chloride)

Sažetak
The process of loss of plasticizers: dioctyl phthalate, diisononyl phtha-late, benzylbuthyl phthalate, dioctyl adipate, phosphate plasticizer Reo-fos, polymeric plasticizer Reoplex and epoxidized soybean oil from plas-ticized poly(vinyl chloride) folies was studied by the method of isothermal thermogravimetry in the temperature range of 120…150 oC. The investi-gated samples contained cca 10 to 40 wt % of plasticizers. The rate con-stants of the process of loss of plasticizers were calculated and the de-pendence of the rate constant on temperature and on the initial concen-tration of plasticizer in plasticized PVC were mathematically defined. The concentration dependence of the rate constant is expressed by parame-ters ko and q. The linear dependence of the function k=f(co) suggests that the process of evaporation from the polymer surface, being slower, gov-erns the process of the loss of plasticizers. The activation energy of the process was calculated from the exponential dependence of the rate constant of evaporation on temperature. Compensation parameters were also calculated as a measure of reaction ability of the system. The role of various parameters (molecular weight, static and dynamic structure of polymer, polarity) on the kinetic parameters of evaporation of plasticizers were discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA