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WAXD and FTIR Studies of Electron Beam Irradiated Biodegradable Polymers

Journal of Physical Science and Application 2012年第4期2卷 80-87页

作者： Yasko Kodama Nelson Batista de Lima Clfiudia Giovedi Luci Diva Brocardo Machado Wilson Aparecido parejo calvol Akihiro Oishi Kazuo Nakayama Radiation Technology Center Nuclear and Energy Research Institute (IPEN-CNEN/SP) Sao Paulo 05508-000 Brazil Science and Materials Technology Center Nuclear and Energy Research Institute (IPEN-CNEN/SP) Sao Paulo 05508-000Brazil Navy Technological Center in Sao Paulo (CTMSP) Sao Paulo 05508-000 Brazil Research Institute for Innovation in Sustainable Chemistry National Institute of Advanced Industrial Science and Technology(AIST) Ibaraki 3058565 Japan

Poly（L-lactic acid）（PLLA） and poly（e-caprolactone）（PCL） have been receiving much attention lately due to their biodegradability in human body as well as in the soil, also due to their biocompatibility, environmentally friendly characteristics and non-toxicity. Morphology of biodegradable polymers affects the rate of their biodegradation. A polymer that has high degree of crystallinity will degrade at a slower rate due to the inherent increased stability. PCL homopolymer crosslinking degree increases with increasing doses of high energy radiation. On the other hand, the irradiation ofPLLA homopolymer promotes mainly chain-scissions at doses below 250 kGy. In the present work, twin screw extruded films of PLLA and PCL biodegradable homopolymers and 50：50 （w：w） blend were electron beam irradiated using electron beam accelerator Dynamitron （E = 1.5 MeV） from Radiation Dynamics, Inc. at doses in the range of 50 kGy to 103 kGy in order to evaluate the effect of electron beam radiation. Wide-angle X-ray diffraction （WAXD） patterns of non irradiated and irradiated samples were obtained using a diffractometer Rigaku Denki Co. Ltd., Multiflex model; and Fourier transform infrared spectroscopy （FTIR） spectra was obtained using a NICOLET 4700, attenuated total reflectance （ATR） technique. By WAXD patterns of as extruded non irradiated and irradiated PLLA it was verified broad diffusion peaks corresponding to amorphous polymer. There was a slight increase of the mean crystallite size of PCL homopolymer with increasing radiation dose. PCL crystalline index （CI） decreased with radiation dose above 500 kGy. But then, PLLA CI increased with radiation dose above 750 kGy. From another point of view, PLLA presence on the 50：50 blend did not interfere on the observed mean crystallite size increase up to 250 kGy. From 500 kGy to 103 kGy the crystallite size of PCL was a little bigger in the blend than the homopolymer. In contrast, FTIR results have shown that this technique was not sen

关键词： Biodegradable polymers PLLA PCL electron beam WAXD FTIR.

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