Citation: LIANG Guomei, ZHANG Kun, FENG Rongyin. MISCIBILITY, THERMAL STABILITY AND RETENTION OF PVP FOR CROSSLINKED PVA/PVP BLENDS*[J]. Chinese Journal of Polymer Science, ;1994, 12(3): 201-209. shu

MISCIBILITY, THERMAL STABILITY AND RETENTION OF PVP FOR CROSSLINKED PVA/PVP BLENDS*

Received Date: 2 February 1993

The thermal behavior, miscibility, crystallite conformation and thermal stability ofcrosslinked(CL-) PVA/PVP blends were studied by DSC and TG methods, respectively. DSCresults showed that in the blend, the crystallinity,Tm and Tc of PVA were obviously lower thanthose of pure PVA; the crystal growth changed from three dimensional to two dimensional andonly a single Tg was detected. These facts demonstrated that this crystalline and amorphousblend have good miscibility. TG curves showed that providing the quantity of K2S2O8 added is more than 3wt%,in the blends PVA will form a stable CL-network,whose thermal degradation temperature was near to that of PVP.But crosslinking reaction will not take place for PVP.The processes of thermal degradation of CL-blends are based on combining both the thermal degradation of PVP and that of PVA crosslinked with corresponding quantity of K2S2O8 CL-agent,respectively.The UV measurements showed that 75wt% of PVP may be remained in CL-blend hydrogels crosslinked by adding (3-5 wt%)K2S2O8.This is mainly due to the stable CL-network formed and the good compatibility and proper entanglement between the composites in the CL-blends.
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