Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3248
標題: 聚乳酸耐衝擊改質研究
Study on Impact Modification of Polylactic Acid
作者: 陳冠文
Chen, Kuan-Wen
關鍵字: 聚乳酸;Polylactic Acid;增韌;Toughness
出版社: 化學工程學系所
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摘要: 
聚乳酸是以乳酸為主要原料聚合的聚合物,具生物可分解性,因此是理想的綠色高分子材料。雖然聚乳酸具有高強度和高模數,其固有的脆性和韌性低限制了應用範圍,因此本研究主要目的是以胺基改質苯乙烯-丁二烯/丁烯-苯乙烯共聚物 (amine modified styrene-butadiene/butylene-styrene copolymer, MP-10)加入聚乳酸以平衡機械性能和聚乳酸的韌性。
在本研究中,採用MP-10彈性體作為聚乳酸 (PLA)的增韌改質劑,利用同向雙螺桿押出機經熔融混煉製備 PLA/MP-10聚摻合物隨後射出成型製作標準試片。PLA聚摻合物機械性質主要特點是抗拉強度、斷裂點延伸率、彎曲強度、楊氏模數和衝擊強度測試,使用微差掃描熱分析儀 (DSC)研究複合材料的熱性質,實驗結果顯示加入MP-10彈性體後結晶度會隨之下降。傅立葉轉換紅外線光譜儀(FT-IR)分析聚摻合物發現MP-10之胺基與PLA反應形成具有醯胺(amide)之連結基。
純PLA與MP-10含量25 wt%之聚摻合物比較,其抗拉強度從660 kgf/cm2降到357.9 kgf/cm2,楊氏模數從1792.4 Mpa降到962.9 Mpa及彎曲強度也從126.1 Mpa下降到70.5 Mpa,然而斷裂點延伸率從7.8 % 顯著提升至343.2 % 增加44倍。電子顯微鏡 (SEM)分析結果顯示,添加MP-10從純PLA的脆性斷裂轉變成聚摻合物的延性斷裂,MP-10的胺基 (amine group)可與PLA分子鏈上的羧酸基 (carboxyl groups)發生反應,IR分析結果可看到在添加25 wt% MP-10聚摻合物(PLA/25S)中出現1644cm-1、1545cm-1,分別代表 AmideⅠ(C = O 拉伸震動峰)及 AmideⅡ(N-H 彎曲震動峰),證明MP-10彈係體已經成功反應在PLA高分子主鏈,使聚摻合物具有醯胺官能基,因此增進PLA和MP-10彈性體之間界面黏著力,促進MP-10與PLA之相容性提升,缺口衝擊強度也隨之增加,純PLA的耐衝擊強度為25.4 J/m,添加25 wt% MP-10後增加到 222.0 J/m。

Polylactic acid (PLA) is a polymer using lactic acid as the main raw material for polymerization. Since it is a non-polluting production processes with biodegradable merit, PLA is an ideal green polymer material. Polylactic acid has high strength and high modulus. However, its inherent brittleness and low toughness restricts the range of applications. The main purpose of this research is to balance the mechanical properties and the toughness of PLA via rubber addition.
In this study, amine groups modified styrene butadiene block copolymer (MP-10) was used as a toughening agent of PLA, the PLA/MP-10 blends were prepared by melt-compounding using co-rotating twin-screw extruder followed by injection molding. The mechanical properties of the PLA composites were characterized by tensile strength, elongation at break, flexural strength, Young’s modulus and Izod impact strength tests. The thermal properties of the blends were also examined using differential scanning calorimeter (DSC). The Fourier transform infrared spectrometer (FT-IR) were used to analyse the reaction occurring in the blens during preparation process.
With the increase of MP-10 content, the blends showed decreased tensile strength, Young’s modulus and flexural strength; however, the elongation and impact toughness were dramatically increased. With the addition of MP-10, the failure mode shifted from brittle fracture for neat PLA to ductile fracture for blends as demonstrated by field emission scanning electron microscope (FESEM). It is found that the amine functional groups of MP-10 can react with the carboxyl groups of PLA, which makes PLA partial compatible with MP-10. Therefore, the Izod impact strength is increased from 25.4 J/m for neat PLA to 222.0 J/m for the blend containing 25 wt % MP-10.
URI: http://hdl.handle.net/11455/3248
其他識別: U0005-2208201200080300
Appears in Collections:化學工程學系所

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