Lin Shaokun
2005
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Guang Zhou Chemical Industry and Technology
Abstract
In this paper, a poly(1 - vinyl - 2 - pyrrolidinone) hydrosol (PVP) containing super high molecular weight PVP(UPVP) and partly cross - linking poly(1 - vinyl - 2 - pyrrolidinone) (CPVP) is synthesized by means of irradiation polymerization of 1 - vinyl - 2 - pyrrolidinone. The polymerization process was carried out in water or in a 5 wt% NaH2PO4 solution and60Co was used as initiator. The molecular weight of UP-VP, degree of cross - linking, network molecular weight (Mc), and the swell ratio of a number of selected gels are characterized. Experimental results show that the Mη of PVP is about 10 times as that of PVP K90. As the concentration of NVP and irradiation dose increased, the degree of cross - linking increased, while the Mc declined. Meanwhile, the swell ratio increased as the irradiation dose declined and the concentration of NVP increased.