Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5204725 | Polymer Degradation and Stability | 2006 | 6 Pages |
Abstract
The thermal and crystalline behaviour of nano-hydroxyapatite (n-HA) reinforced polyamide 66 (PA66) biocomposites was studied by thermogravimetry (TG) and differential scanning calorimetry (DSC). The thermal properties of PA66 and n-HA/PA66 composites were analysed by TG. The effect of hydroxyapatite on the melting and crystallization of PA66 was evaluated by DSC. DSC measurements exhibited an increase in the crystallization temperature, however, decrease in crystallinity with the addition of n-HA to the PA66 matrix, which was attributed to the hydrogen bonds between the n-HA surface and polyamide 66 molecules. With increase of n-HA content, the melting peak of the PA66 component shifted to higher temperature, suggesting constrained melting. The addition of n-HA to PA66 played the role of nucleating agent and enhanced the crystallization rate. Non-isothermal parameter a measured by Liu method varies from 1.13 to 1.18, from 1.02 to 1.07, and from 1.18 to 1.21 for PA66, 30Â wt% n-HA/PA66 and 40Â wt% n-HA/PA66, respectively, and the values of K(T) systematically increase with rise in relative degree of crystallinity.
Related Topics
Physical Sciences and Engineering
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Authors
Xiang Zhang, Yubao Li, Guoyu Lv, Yi Zuo, Yuanhua Mu,