聚乳酸与麦草纤维共混物的研究  

Blends of Poly(L-lactic Acid) and Wheat Straw Fiber

作　　者：高勤卫[1] 徐晨[1] 徐哲[1] 赵丽芳[1] 

机构地区：[1]南京林业大学化学工程学院,江苏南京210037

出　　处：《林产化学与工业》2012年第4期1-4,共4页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(50573032);江苏高校优势学科建设工程资助项目(无编号)

摘　　要：以N-甲基吗啉-N-氧化物为溶剂,制备聚L-乳酸(PLLA)与麦草纤维(WSF)的共混溶液,并制备PLLA与WSF的共混物。采用傅里叶变换红外光谱、差示扫描量热法和X射线衍射等方法对PLLA/WSF共混物进行表征,探讨PLLA/WSF共混物中两组分的相容性和结晶性。结果表明,聚乳酸和麦草纤维的N-甲基吗啉-N-氧化物溶液可以均匀混合形成共混溶液。在PLLA/WSF共混物中,PLLA与WSF两组分之间的相互作用较强,具有较好的相容性。PLLA/WSF共混物的组成对其形态与性能具有显著影响。随着PLLA用量的增加,共混物的玻璃化温度逐步降低。当PLLA与WSF的质量比小于6∶4时,共混物为非晶态物质,而当PLLA与WSF的质量比大于6∶4时,共混物则具有结晶结构,且结晶熔点随着PLLA质量分数的增加而增加。因此,通过改变PLLA和WSF组分的配比,可以制备不同性能的可生物降解高分子材料。The blend solutions of poly （ L-lactic acid） （PLLA） and wheat straw fiber （WSF） were prepared in the solvent of N-methyl morpholine-N-oxide. Then the blends of PLLA and WSF were also prepared. Fourier transform infrared spectroscopy, differential scanning calorimetry and X-ray diffraction were performed to determine PLLA/WSF blends. The compatibility and crystalline of PLLA and WSF in blends were investigated. The results show that PLLA and WSF can form a homogeneous mixture solution in N-methyl morpholine-N-oxide. Strong interaction between PLLA and WSF can be detected, which suggests good compatibility between the two components in PLLA/WSF blends. The morphology and properties of PLLA/WSF blends vary with the ratios of PLLA to WSF. With increasing PLLA contents, the glass transition temperatures of PLLA/WSF blends gradually reduce to that of PLLA. Both PLLA and WSF are crystalline, while PLLA/WSF blends are amorphous when the ratio of PLLA to WSF is less than 6 ： 4. When the ratio of PLLA/WSF is more than 6 ： 4, the blend is crystalline and their melting points increase with increasing PLLA contents. Thus biodegradable polymeric materials with different properties can be prepared through changing ratios of PLLA to WSF.

关 键 词：聚L-乳酸 麦草纤维 共混物 

分 类 号：TQ351[化学工程]