Compatible blends of biorelated polyesters through catalytic transesterification in the melt

被引：90
作者：
Coltelli, Maria-Beatrice [1 ,2 ]
Toncelli, Claudio [1 ]
Ciardelli, Francesco [1 ,2 ]
Bronco, Simona [3 ]
机构：
[1] Dept Chem & Ind Chem, I-56126 Pisa, Italy
[2] SPIN PET Srl, I-56126 Pisa, Italy
[3] CNR, IPCF, I-56124 Pisa, Italy
来源：
POLYMER DEGRADATION AND STABILITY | 2011年 / 96卷 / 05期
关键词：
Biodegradable polyesters; Reactive blending; Transesterification; Poly(lactide); Poly(butylene adipate-co-terephthalate); RING-OPENING POLYMERIZATION; ACID-BASED COPOLYESTERS; POLY(LACTIC ACID); MECHANICAL-PROPERTIES; REACTIVE COMPATIBILIZATION; BLOCK-COPOLYMERS; POLY(ETHYLENE-TEREPHTHALATE) PET; HYDROLYTIC DEGRADATION; MOLECULAR-WEIGHT; PHASE-STRUCTURE;
D O I：
10.1016/j.polymdegradstab.2011.01.028
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The transesterification during the melt blending of polylactide (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) was investigated in presence of Ti(OBu)(4) as a catalyst. Both the effect of catalyst concentration and reaction duration was considered. The process was studied by analyzing the molecular weight of the polyesters by size exclusion chromatography (SEC). The rheological, thermal and morphological properties of the blends were investigated by melt flow rate, DSC and SEM analyses, respectively. Evidences about the formation of PBAT-PLA copolymers were obtained and discussed. The tensile properties of compression moulded films were also determined and correlated to the structure and phase morphology development of the blends. In particular, the use of Ti(OBu)(4) resulted in the improvement of compatibility. Moreover, the decrease in stiffness and the increase in elongation at break with the increase of mixing time was observed, in good agreement with the improved compatibility of the modified blend. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：982 / 990
页数：9
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