Melt rheology of polylactide/poly(butylene adipate-co-terephthalate) blends

被引：241
作者：
Gu, Shu-Ying [1 ,2 ]
Zhang, Ke
Ren, Jie [1 ,2 ]
Zhan, Hui
机构：
[1] Tongji Univ, Sch Mat Sci & Engn, Inst Nano & Biopolymer Mat, Shanghai 200092, Peoples R China
[2] Tongji Univ, Minist Educ, Sch Mat Sci & Engn, Key Lab Adv Civil Engn Mat, Shanghai 200092, Peoples R China
来源：
CARBOHYDRATE POLYMERS | 2008年 / 74卷 / 01期
关键词：
rheology; polylactide; poly(butylene adipate-co-terephthalate); blends;
D O I：
10.1016/j.carbpol.2008.01.017
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Polylactide (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) were melt blended using a twin-screw extruder. The phase morphology of PLA/PBAT blends was observed by scanning electronic microscopy (SEM). The linear and non-linear shear rheological behaviors of PLA/PBAT melts were investigated by an advanced rheology expended system (ARES). The results show that PLA/PBAT blend is a kind of immiscible, two-phase system where PBAT disperses evenly in PLA matrix. Linear viscoelastic limits of PLA/PBAT melts are smaller than that of neat PLA melt. At lower frequencies, storage moduli (G') of PLA/PBAT melts increase with PBAT content. PBAT content has no significant effect on loss moduli (G '') of PLA/PBAT melts, but the relaxation moduli of the melts increase with the introduction of PBAT. At the same time, the incorporation of PBAT results in a gradual increase of the melt viscosity and a decrease of flow activation energy. Besides PBAT causes a decrease of flow index n, which is in conformity with the more serious shear-thinning tendency of PLA/PBAT melts. (c) 2008 Elsevier Ltd. All rights reserved.
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收藏
页码：79 / 85
页数：7
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