Synthesis, Mechanical and Photodegradation Properties of Poly(1,4-Butylene Itaconic-Co-Terephthalate) and Their Composites with Functionalized Layered Double Hydroxides

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Abstract
A new biodegradable poly(1,4-butylene itaconic-co-terephthalate) (PBIT) and their composites with functionalized layered double hydroxides (m-LDH) are synthesized through the one-step transesterification and polycondensation process. Both Fourier transform infrared spectroscopy (FTIR) and complex viscosity experiments of various compositions of PBIT suggest that the C=C double bond and crosslinking density were increased with increasing the content of itaconic acid comonomer units. Experimental results of PBIT/m-LDH composites observed using X-ray diffraction and transmission electron microscopy to characterized the microstructure and morphology reveal that the m-LDH is extremely distributed and exfoliated in PBIT matrix. The storage modulus at -80 °C of PBIT/m-LDH composites were enhanced more than 70% as compared to those of neat PBIT. The FTIR and scanning electron microscopy were used to characterize the photodegradation behavior for PBIT/m-LDH composites. The change of carboxyl group via photodegradation experiment of PBIT/m-LDH composites reveals that the increasing content of IT unit and m-LDH into PBIT can enhance UV protection ability in the composite materials. These performances were possibly due to the superior UV protection ability of the crosslinking and shielding effect of higher IT unit and m-LDH. This study presents a predictable method to improve the mechanical properties and the UV photodegradation behavior of biodegradable polymer by the incorporation of m-LDH.

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