Studies of Relationship Between Molecular Weights and Antifreezing Properties of Poly(N-vinylpyrrolidone)
Non-freezable bound water(NFBW)surrounding a certain compounds can remain in a liquid state at low temperatures.Aque-ous solutions of poly(N-vinylpyrrolidone)with four different molecular weights were measured by calorimetry to determine the NFBW surrounding the PVPs.It was found that the highest content of NFBW is 74.97 g water per 100 g of polymer,and the number of NFBW molecules associated with its polymer structural units was 4.62.The lowest content of NFBW is 30.02 g water/100 g of polymer with a poor anti-freezing performance.The an-ti-freezing performance of PVP varies with their molecular weights.Molecular weight is an important factor affecting the applications of the polymer as an anti-freezing material.
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