Preparation of PLLA-co-bis A ER/VMT Nanocomposites by In Situ Polymerization Process

Hong Xu*, Yali Bai, Zhiping Mao*
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.

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© 2011 Xu et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China; Tel: +86-21-6779272; Fax: +86-21-67792707; E-mail:,


Poly(L-lactic acid)-co-bisphenol-A epoxy resin/vermiculite nanocomposites (PLLA–co-bis A ER/VMT) were prepared by in situ melt polycondensation of L-LA in the presence of amino-modified vermiculite. The fourier transform infrared (FTIR) spectra was used to investigate molecular interactions between the modified vermiculite and PLLA. Transmission electron microscopy (TEM) testing indicated that the VMT particles were finely dispersed in the PLLA-co- Bis A ER matrix. The molecular weight kept almost constant at low VMT content (0.5 wt%, 1 wt%) but decreased at higher VMT content (2%). The detailed thermal property and crystallization behavior of samples were studied by using polarized optical microscopy (POM), differential scanning calorimetry (DSC) and thermogravimetric analyzer (TGA). The results indicated that the thermal stability, overall crystallization rate and spherulitic texture of PLLA-co-bis A ER were strongly influenced in the presence of vermiculite particles.

Keywords: Poly(L-lactic acid)–co–bisphenol-A epoxy resin, vermiculite, nanocomposites, crystallization, thermal property.