- 學位論文
環境老化效應對塑木複合材料機械性質影響之研究
Mechanical Properties of Wood-Plastic Composites Under Environment Aging Effects
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摘要
本研究主要以聚對苯二甲酸乙二醇酯(PET)與聚醯胺6(PA 6, 商品名為Nylon 6）為基材，木粉為添加材來製備塑木複材。兩種塑料基(PET/ Nylon 6)之摻混比例分別為60/40、50/50和40/60。在固定木粉添加量後，分別探討添加聚烯烴彈性體接枝馬來酸酐(POEgMA)或甲基丙烯酸酯-丁二烯-苯乙烯(MBS)此兩種改質劑對塑木複材機械性質的影響，接著並探討在不同溫濕老化、溫濕效應與加速風化試驗下對其機械性質的影響。 研究結果顯示，塑木複材經過30天之溫濕老化與加速風化測試後，不論添加POEgMA或MBS，其拉伸強度、彎曲強度與彎曲模數在高溫高濕條件下(55℃/90RH%)損失量最大，且加速風化30天後皆有下降的趨勢；並且由於Nylon 6吸濕增韌的作用，反而使得在高溫高濕下其衝擊強度有提升的效果。然而加速風化環境對於塑木複材的影響，不僅造成機械性質的改變，也因為光降解與吸濕作用導致塑木複材產生表面顏色之變化；複材潛變研究方面，塑木複材之應變量皆隨溫濕環境提升或是應力增加而提升。
並列摘要
Concern for the environment, both in term of limiting the use of finite resources and the need to manage waste disposal, one of the rising environment protection materials is wood plastic composites(WPC). The study investigates the feasibility of using recycle Nylon6, Poly(ethylene terephthalate) and wood flour to manufacture experimental composite specimens. The specimens were made through extrusion, pelletised and injection molding. By adding POE-g-MA as agent into PET/Nylon (60/40、50/50、40/60), and MBS as impact- resistant agent into PET/Nylon (60/40、50/50、40/60), then discuss mechanical properties of WPC under different thermal and humid aging, thermal and humid effect and accelerate weathering. After thermal and humid aging for 200 hours and then accelerate weathering for one month, the result showed that no matter add POE-g-MA or MBS in the WPC, its tensile strength, flexure strength and flexure modulus will lose the biggest amount in the 55℃/90RH%. After accelerate weathering for one month, the result showed a decreasing trend. Besides, the impact strength in the 55℃/90RH% will enhance because the moisture absorption of Nylon6 can make WPC become more tougher. When it comes to the effect in accelerate weathering, the mechanical properties will be changed, and during exposure to UV radiation and water spray, will cause the material fade. In the end, we discuss creep of the WPC on the influence of different thermal and humid effects.
參考文獻
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