Analysis of inner structure in high-strength biodegradable fibers by X-ray microtomography using synchrotron radiation
- 作者：Toshihisa Tanaka ; Kentaro Uesugi ; Akihisa Takeuchi ; Yoshio Suzuki ; Tadahisa Iwata
- 关键词：Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyvalerate] ; X-ray microtomography ; High-strength biodegradable fiber
- 刊名：Polymer
- 出版年：2007
- 期刊代码：83_00323861
- 类别：ms
- 出版时间：21 September 2007
- 卷：48
- 期：20
- 页码：6145-6151
- 文件大小：2750 K
摘要
The observation of the inner structure of materials without pretreatment or damage is a very useful analytical method in the field of materials science as well as in medicine and biology. We have carried out a three-dimensional (3D) analysis of biodegradable polyester bacterial-poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyvalerate] (P(3HB-co-3HV)) fibers with high tensile strength (1.07 GPa) using X-ray microtomography with synchrotron radiation. The inner structure of the fibers was visualized at a spatial resolution of 1 μm. There are many fine voids for one-step-drawn P(3HB-co-3HV) fibers after isothermal crystallization from the result of X-ray microtomography. This revealed that the clear streak reflection along the equator in small-angle X-ray scattering is caused by these fine voids. The recalculated tensile strength of one-step-drawn P(3HB-co-3HV) fibers after isothermal crystallization is suggested to be 2.02 GPa, taking the cross-section area with 52.7%(polymer region) into consideration. These fine voids in fibers seemed to be generated by the volume changes due to the contraction of polymer chains during isothermal crystallization.