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Date of Approval：2019.09.25

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Number of Access this item:506（2024-05-18 15:16 Counts）

Identifier to cite or link to this item:http://hdl.handle.net/10212/2549

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D1-0939_y1	pdf	105 KB	49	内容の要約
D1-0939	pdf	195 KB	44	内容・審査結果の要旨

Item Information

title	Studies on Enhancement in Crystallization Behavior of Poly(lactic acid) by Silk Fibroin Nanodisc
title.alternative	シルクフィブロインナノディスクを利用したポリ乳酸の結晶化挙動の向上のための研究
contributor.author	PANDEY AMIT KUMAR
subject	poly(L-lactic acid)
	poly(D-lactic acid)
	silk fibroin nanodisc
	isothermal crystallization
	stereocomplex crystallites
	homocrystallites
	synchrotron wide-angle X-ray scattering measurement
dateofgranted	2019-09-25
degreename	博士(工学)
grantor	京都工芸繊維大学
grantid	14303甲第939号
Category	Date of Approval：2019.09.25

title	Studies on Enhancement in Crystallization Behavior of Poly(lactic acid) by Silk Fibroin Nanodisc
title.alternative	シルクフィブロインナノディスクを利用したポリ乳酸の結晶化挙動の向上のための研究
contributor.author	PANDEY AMIT KUMAR 著者名の異表記形パンディアミットクマル
subject	poly(L-lactic acid)
	poly(D-lactic acid)
	silk fibroin nanodisc
	isothermal crystallization
	stereocomplex crystallites
	homocrystallites
	synchrotron wide-angle X-ray scattering measurement
dateofgranted	2019-09-25
date.issued	2019-09-25
description.abstract	Poly(lactic acid) (PLA) is one of the most popular biobased polymer. Although the ultimate tensile strength of PLA is comparable to poly(ethylene terephthalate), slow crystallization of PLA limits its wide spreading of applications. In this study, a biobased filler, silk fibroin nanodisc (SFN), was included in the PLA matrix with the aim of accelerating the crystallization process of PLA. This dissertation consists of three chapters. In chapter 1, the detailed investigation of the effect of SFN inclusion on the crystallizability of PLLA was performed by the polarizing optical microscope observation and the differential scanning calorimetry (DSC) measurement. For the isothermal crystallization studies by DSC, extremely quick cooling (~300℃/min) from the melt to the crystallization temperature has been conducted. The experimental results show that the small amount of SFN (only 1%) can significantly enhance the crystallizability of PLLA. It was found that the SFN works as a nucleation agent by increasing the number of nuclei about 4 times while it doesn’t change the growth rate of the spherulites. In chapter 2, the time-resolved synchrotron wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques were employed to study the effect of SFN on the evolution of the structure and the kinetics of the crystallization of PLLA. The results showed that the loading SFN shortens the induction period and increases the ultimate degree of crystallinity. The crystallization half-time was reduced which suggests that the overall crystallization process was accelerated. The SAXS results suggested that the lamellar thickening process was accelerated, and the thickness of the initial lamella was decreased by loading 1% SFN in PLLA. In chapter 3, the effect of SFN on the stereo-complex (SC) formation in the blend of PLLA/PDLA(50/50) was studied by using the DSC and time-resolved WAXS techniques. It was found that the SFN favors the formation of SC crystallites than the homo-crystallites (HC). However, the induction period for the HC was unchanged.
degreename	博士(工学)
grantor	京都工芸繊維大学
grantid	14303甲第939号
identifier.uri	http://hdl.handle.net/10212/2549
language.iso639-2	eng
rights.textversion	none
sortkey	9
type.nii	Thesis or Dissertation
type	Thesis

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