Thermal degradation of blends of PVC with polydiphenylsiloxane (PDPS) and p
olydimethyldiphenylsiloxane (PDMDPS) has been studied by thermogravimetry (
TG) and differential thermal analysis (DTA) over the whole composition rang
e. From the TG and DTA data, curves have been constructed to enable the exp
erimental weight loss behavior to be compared with the component polymers.
Activation energy and order of reactions were calculated for the blends and
component polymers using TG data. The results show slight destabilization
at low loading of PDPS and PDMDPS but for compositions with 50% or more PDM
DPS and PDPS, both polymers are stabilized, particularly the PDMDPS blends
which show much slower weight loss. (C) 1999 Elsevier Science Ltd. All righ
ts reserved.