生物可分解的聚丁二酸二丁酯及含少量丁二酸二丙酯之共聚酯/蒙脫土之奈米複合材料

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生物可分解的聚丁二酸二丁酯及含少量丁二酸二丙酯之共聚酯/蒙脫土之奈米複合材料

Biodegradable poly(butylene succinate) and its copolyesters with minor amounts of propylene succinate/montmorillonite nanocomposites

吳臣哲 , Masters　　Advisor：陳明　　

繁體中文

奈米複合材料；等溫結晶動力學；蒙脫土；共聚酯；聚丁二酸二丁酯； montmorillonite ； nanocomposites ； isothermal crystallization kinetics ； copolyester ； poly(butylene succinate)

Abstract │ Reference (41) │ Altmetrics

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In this study, biodegradable nanocomposites were prepared. In order to improve the compatibility between polymer and montmorillonite (MMT), the surface of MMT was organo-modified by disodium cocoamphdipropionate (K2). Then, poly(butylene succinate) (PBSu) and its copolyesters with minor amount of propylene succinate (PBPSu90/10, PBPSu80/20) were blended with 1, 3, or 5 wt% of MMT-K2, respectively, by the melt intercalation. The physical properties of these biodegradable nanocomposites were characterized before studying their crystallization and melting behaviors. The Fourier Transform Infrared spectrum and wide-angle X-ray diffraction (WAXD) pattern show that MMT was successfully modified with K2, and the interlayer distance of MMT was increased from 1.62 to 3.94 nm. The WAXD patterns of nanocomposites yield that the interlayer distance of MMT-K2 was higher than 5.94 nm. The micrographs of transmission electron microscope indicate that these nanocomposites were intercalated, not exfoliated. The results of thermogravimetric analysis revealed that the thermal stability of the resultant nanocomposites was reduced after the addition of MMT-K2. Dynamic mechanical properties of the fabricated 3wt% or 5 wt% nanocomposites of these aliphatic copolyesters showed significant enhancements in the storage modulus compared with the neat matrix, even higher than that of PBSu.
   The effect of MMT-K2 on the isothermal crystallization behavior of PBSu, PBPSu90/10, and PBPSu80/20 was investigated using a differential scanning calori- meter (DSC) and polarized light microscopy (PLM). The Avrami equation successfully describes the isothermal crystallization kinetics of these nanocomposites and the value of Avrami exponent was between 2.42 and 3.35. The crystallization rate of neat BP80 was faster than BP80/MMT nanocomposites. This may be ascribed to the incompatibility of BP80 with MMT. On the contrast, the crystallization rate of BP90 or B100 nanocomposites was enhanced as the amount of MMT-K2 increased. The molecular weight of neat polymer before and after the melt intercalation indicated that the reduced molecular weight resulted in the increase of the growth rate of spherulites. Besides, it was found that the incorporation of MMT-K2 has little effect on the crystalline structure as well as the melting behavior of B100, BP90, or BP80.

Reference ( 41 ) 〈TOP〉

2.M. Mochizuki, M. Hirami, Structural effects on the biodegradation of aliphatic polyester, Polym. Adv. Technol., 1997, 8, 203-209.
連結：
3.J. Yang, W. Tian, Q. Li, Y. Li, A. Cao, Novel biodegradable aliphatic poly(butylene succinate-co-cyclic carbonate)s bearing functionalizable carbonate building blocks:II. Enzymatic biodegradation and in vitro biocompatibility assay, Biomacromolecules, 2004, 5, 2258-2268.
連結：
4.H. Pan, J. Yu, Z. Qiu, Crystallization and morphology studies of biodegradable poly(ɛ-caprolactone)/polyhedral oligomeric silsesquioxanes nanocomposites, Polym. Eng. Sci., 2011, 51, 2159-2165.
連結：
5.S. S. Ray, K. Okamoto, M. Okamoto, Structure-property relationship in biodegradable poly(butylene succinate)/layered silicate nanocomposites, Macromolecules, 2003, 36, 2355-2367.
連結：
6.S. S. Ray, K. Okamoto, M. Okamoto, New poly(butylene succinate)/layered silicate nanocomposites. II. Effect of organically modified layered silicates on structure, properties, melt rheology, and biodegradability, J. Polym. Sci. Part B: Polym. Phys., 2003, 41, 3160-3172.
連結：

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