本文選題：聚乳酸 + 木纖維�。� 參考：《西南林業(yè)大學學報(自然科學)》2017年02期

【摘要】：采用混合熱壓的方法制備不同形態(tài)木纖維/PLA復合材料,并通過DSC和POM分析不同形態(tài)木纖維與PLA復合對PLA等溫和非等溫結晶特性的影響。結果表明:木纖維的加入影響了PLA等溫結晶的結晶度、結晶速率和熔融溫度等特性。中等尺寸木纖維(直徑為0.012~0.050mm,長度為0.3~4.0 mm)能夠最有效地增加PLA的結晶度和結晶速率;較大尺寸的木纖維(直徑為0.07~0.50 mm,長度為2~10 mm)會阻礙結晶的生長從而降低PLA的結晶度和結晶速率。木纖維復合材料中PLA的熔融溫度會隨著加入木纖維的尺寸增加而增加;在非等溫結晶過程中木纖維會使PLA的結晶度、結晶溫度和熔融溫度升高,但是尺寸較大的纖維(直徑為0.07~0.50 mm,長度為2~10 mm)同樣對結晶的生長有很強的阻礙作用,從而降低了PLA的結晶度、結晶溫度。POM結果表明,木材纖維會促進PLA的異相成核,并且使PLA在木材纖維表面形成橫向結晶層,并且進一步證明了大尺寸的纖維會阻礙結晶生長。
[Abstract]:Wood fiber / PLA composites with different morphology were prepared by mixed hot pressing. The effects of different wood fibers and PLA composites on the non-isothermal crystallization properties of PLA were analyzed by DSC and POM. The results show that the addition of wood fiber affects the crystallinity, crystallization rate and melting temperature of PLA isothermal crystallization. The medium size wood fiber (0.012 ~ 0.050 mm in diameter and 0.3 ~ 4.0 mm in length) can increase the crystallinity and crystallization rate of PLA most effectively. The larger size of wood fiber (0.07 ~ 0.50 mm in diameter and 2 ~ 10 mm in length) will hinder the crystal growth and decrease the crystallinity and crystallization rate of PLA. The melting temperature of PLA in wood fiber composites increases with the increase of the size of wood fiber, and the crystallinity, crystallization temperature and melting temperature of PLA increase during non-isothermal crystallization. However, the larger fibers (0.07 ~ 0.50 mm in diameter and 2 ~ 10 mm in length) also have a strong hindering effect on the crystal growth, thus reducing the crystallinity of PLA. The results of crystallization temperature 路POM show that wood fibers can promote the heterogeneous nucleation of PLA. Moreover, PLA formed a transverse crystalline layer on the surface of wood fiber, and it was further proved that the large size fiber could hinder the crystal growth.
【作者單位】： 黑龍江省木材科學研究所;中國林業(yè)科學研究院木材所;
【基金】：黑龍江省財政自擬項目資助 黑龍江省森林工業(yè)總局科技計劃項目資助
【分類號】：TB332;O631.3
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本文編號：1894990