Quantitative evaluation of the hydrogen bonding effects on the crystallization kinetics of poly(vinyl alcohol)/tea polyphenol composites.

The crystallization kinetics behaviors of PVA (poly (vinyl alcohol))/TP (tea polyphenol) composites were studied. Results showed that the addition of TP component in PVA formed composites would reduce the crystallinity (%), leading to the formation of a lower Avrami exponent, n. Under the fixed cooling rate condition, the n values of Avrami and α values of Mo are both higher for the above composites with TP ingredient at 10–20%. Subsequently, the influence of the hydrogen bonding (H-bonding) in PVA/TP composites, pure PVA and non-hydrogen bonding (non-H-bonding) in such composites were further quantitatively assessed by analyzing the H-bonding factor, F%, in relation to different crystallization kinetic parameters including Avrami exponent n, Zt, α and F(T). Results showed that the relationship of Avrami exponent n and α were presented as n = -a1 + b1FPVA/TPH-bonding-c1F2PVA/TPH-bonding and α = -a5 + b5FPVA/TPH-bonding-c5F2PVA/TPH-bonding. The Zt was described as the functions like Zt = a2-b2e(FPVA/TPH-bonding−c2)/d, Zt = -a3 + b3FPVAH-bonding-C3F2PVAH-bonding, and Zt = a4(Fnon-H-bonding-b4)c4, respectively. The F(T) was presented as F(T) = a6-b6FPVA/TPH-bonding+c6F2PVA/TPH-bonding, where a, b and c are positive constants. [ABSTRACT FROM AUTHOR]