PREPARATION AND CHARACTERIZATION OF THERMOPLASTIC STARCH/PLA BLENDS BY ONE STEP REACTIVE EXTRUSION
PREPARATION AND CHARACTERIZATION OF THERMOPLASTIC STARCH/PLA BLENDS BY ONE STEP REACTIVE EXTRUSION
复制标题
DOI：
10.1002/pi.2302
复制
发表时间：
2007-11
影响因子：
3.2
通讯作者：
Ning Wang;Jiu-gao Yu;Xiaofei Ma
中科院分区：
文献类型：
--
作者：
Ning Wang;Jiu-gao Yu;Xiaofei Ma
在过氧化二异丙苯存在下，以马来酸酐（MA）为相容剂，研究了热塑性干淀粉（DTPS）/聚乳酸（PLA）共混物的相容性。在单螺杆挤出机中采用一步反应挤出法实现了淀粉的增塑及其与聚乳酸的增容改性。通过扫描电镜观察发现，MA的存在可改善DTPS/PLA共混物中淀粉的塑化作用，并可获得均匀的DTPS/PLA共混物。拉伸试验表明，增容后的DTPS/PLA共混物的拉伸强度比原复合材料提高了40.5MPa。差热分析表明，MA的加入使DTPS与PLA的玻璃化转变温度比未加任何助剂的共混物更接近，表明DTPS与PLA的相容性得到改善。傅里叶变换红外光谱证明MA的加入改善了DTPS与PLA之间的相互作用。同时，共混物变得更加热稳定，如热重分析结果所示。在增容共混物中检测到约450 °C的新的分解峰，其高于DTPS和PLA所观察到的那些。最后，流变学研究表明，MA可以改善DTPS/PLA共混物的流动性。版权所有© 2007化学工业协会
In the presence of dicumyl peroxide, the compatibility of thermoplastic dry starch (DTPS)/poly(lactic acid) (PLA) blends, using maleic anhydride (MA) as compatibilizer, was investigated. The plasticization of starch and its compatibilizing modification with PLA was accomplished in a single-screw extruder by one-step reactive extrusion. In the presence of MA, the plasticization of starch in DTPS/PLA blends could be improved and homogeneous DTPS/PLA blends could be achieved as observed using scanning electron microscopy. Tensile tests showed that the tensile strength of compatibilized DTPS/PLA blends was about 40.5 MPa higher than that of the original composites. Differential thermal analysis indicated that the glass transition temperature of DTPS and PLA became closer in the presence of MA than the blend without any additions, which suggested the compatibility between DTPS and PLA was improved. In addition, Fourier transform infrared spectroscopy proved that MA improved the interaction between DTPS and PLA. At the same time, the blend became more thermally stable as shown by thermogravimetric analysis results. A novel decomposition peak at about 450 °C was detected in the compatibilized blend, which was higher than those observed for DTPS and PLA. Finally, a rheological study suggested that MA could improve the fluidity of DTPS/PLA blends. Copyright © 2007 Society of Chemical Industry