Analysis of inner structure in high-strength biodegradable fibers by X-ray microtomography using synchrotron radiation

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 mu m.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.