Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10270
標題: 不同劑量γ-ray照射聚乳酸微結構與特性研究
Effect of various γ-ray dose on the microstructure and properties of poly(lactic acid)
作者: 王國雄
Wang, Kuo-Hsiung
關鍵字: Gamma irradiation;伽瑪輻射;Polylactic acid;biodegradability;聚乳酸;生物可分解性
出版社: 材料科學與工程學系所
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摘要: 
由於聚乳酸塑膠同時擁有生物相容性與生物可分解性,且具有良好的機械特性,因此在所有的可分解性塑膠中佔有相當大的應用市場,如包裝材料、生醫材料及纖維材料等。
目前在食品或是醫療器材等均逐漸利用γ-射線來達到滅菌的效果,本研究針對市售聚乳酸材料在γ-射線照射前後,將聚乳酸材料在溫度120℃的條件下annealing 處理2小時,探討不同輻射劑量γ-射線對市售聚乳酸材料微結構與特性的影響。
由實驗結果得知,聚乳酸材料在抗拉強度、起始熱裂解溫度,均隨著輻射劑量的增加而衰退,且先經annealing處理之聚乳酸,較先照射γ-射線後再annealing處理之性質佳。
利用DSC分析熔點與結晶度的變化,發現隨著照射劑量的增加,呈現微幅上升後在再下降的趨勢,且先照射γ-射線後再annealing處理的樣品結晶度較高。而量測聚乳酸的平均分子量發現,呈現兩段不同衰退速率,在低照射劑量範圍衰退速率較大。
以XRD觀察結果顯示,聚乳酸試片的特性峰值並未因不同的輻射劑量而有明顯的改變。而將未經annealing處理的聚乳酸樣品,以每10℃的間隔由40℃逐步加熱120℃,每一個間隔持溫10分鐘,對聚乳酸進行即時XRD觀測(in situ XRD),發現未照射γ-射線的樣品在90℃時有繞射峰產生,而照射劑量為300kGy的試片,在60℃時即有明顯的繞射峰產生。

Polylactic acid (PLA), a well-known biodegradable and biocompatible polymer, contain excellent mechanical and thermal properties. Among these biodegradable polymers, PLA provides a possible candidate to replace the traditional plastics in the applications of packaging materials, bio-materials and fibers.
Different procedures can be utilized for the sterilization of the food and medical instruments. Gamma irradiation used for sterilization has performed excellent penertration characteristics of ionizing radiation and high efficient sterilization. The purpose of this study is to examine the effect of dose for gamma radiation on the microstructure and properties of PLA.
The glass transition, melting temperatures and molecular weight decreased with increasing irradiation dose. The mechanical property and thermal stability for PLA thermally treated before irradiation are higher than those treated after irradiation or without annealing treatment. The in situ X-ray diffraction studies have shown that the treatment of gamma irradiation decreases the recrystallization temperature.
URI: http://hdl.handle.net/11455/10270
其他識別: U0005-2206200617432600
Appears in Collections:材料科學與工程學系

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