Ning, Zhenbo5; Nielsen, Ronnie Bo Højstrup1; Zhao, Lifen7; Yu, Donghong2; Gan, Zhihua5
1 Department of Chemistry and Bioscience, The Faculty of Engineering and Science, Aalborg University, VBN2 Section of Chemistry, The Faculty of Engineering and Science, Aalborg University, VBN3 The Faculty of Engineering and Science, Aalborg University, VBN4 Supramolekular Chemistry, The Faculty of Engineering and Science, Aalborg University, VBN5 CAS Key laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences6 Shandong University of Science and Technology7 Shandong University of Science and Technology
Oriented and non-oriented Teflon films, which were found to have the same crystalline structure, but different surface morphologies, were used to sandwich poly(butylene adipate) (PBA) films during isothermal crystallization. It was found that both the Teflon surface structure and the PBA polymorphic structure are the determining factors to induce epitaxial crystallization. The oriented Teflon film was able to induce epitaxial crystallization of PBA alpha crystal, while the non-oriented Teflon did not induce any epitaxial crystallization of PBA. Epitaxial crystallization did not occurred for PBA beta crystals between neither the oriented nor the non-oriented Teflon films. The enzymatic degradation rate of PBA films was not determined by the epitaxial crystallization, in fact it was still dependent on the polymorphic crystal structure of PBA. The morphological changes of PBA films after enzymatic degradation confirmed again that the epitaxial crystallization only occurred for the PBA film with alpha crystal structure which was produced by being sandwiched between oriented Teflon films, and it happened only on the surface of PBA films.
Chinese Journal of Polymer Science, 2014, Vol 32, Issue 9, p. 1243-1252