Concurrent Enhancement of Multiple Properties in Reactively Processed Nanocomposites of Polylactide/Poly[(butylene succinate)-co-adipate] Blend and Organoclay

被引:28
作者
Ojijo, Vincent [1 ,2 ]
Ray, Suprakas Sinha [1 ,3 ,4 ]
Sadiku, Rotimi [2 ]
机构
[1] CSIR, DST CSIR Natl Ctr Nanostruct Mat, ZA-0001 Pretoria, South Africa
[2] Tshwane Univ Technol, Div Polymer Technol, Dept Chem Met & Mat Engn, ZA-0001 Pretoria, South Africa
[3] Univ Johannesburg, Dept Appl Chem, ZA-2028 Johannesburg, South Africa
[4] King Abdulaziz Univ, Dept Chem, Jeddah 21589, Saudi Arabia
基金
新加坡国家研究基金会;
关键词
improved multiple properties; nanocomposites; organoclay; polylactide; poly[(butylene succinate)-co-adipate] blends; reactive processing; POLYLACTIDE/LAYERED SILICATE NANOCOMPOSITES; BIODEGRADABLE IMPACT MODIFIERS; THERMAL-DEGRADATION; POLY(BUTYLENE SUCCINATE); POLY(LACTIC ACID); MECHANICAL-PROPERTIES; ADIPATE-CO-TEREPHTHALATE) BLENDS; TERNARY BLENDS; MORPHOLOGY; BEHAVIOR;
D O I
10.1002/mame.201300306
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Polylactide (PLA) and poly[(butylene succinate)-co-adipate] (PBSA) were reacted by being blended in a batch mixer in the presence of a chain extender, triphenyl phosphite (TPP), and two different types of organically modified claysa montmorillonite clay (C20A) and a synthetic mica (MEE)to enhance the thermal stability, impact toughness, and barrier properties of the PLA. An accelerated increase in the torque during processing indicated catalyzed chain-extension reactions in the clay-based compatibilized blends. The rate and extent of the increase in the chain extension/coupling were dependent on the type of organic surfactant used to modify the pristine clays. Enhanced chain extension/coupling and char formation resulted in dramatic thermal-stability increases of 17 and 26 degrees C for composites with 2 and 6wt% C20A loadings, respectively. Similarly, the oxygen and water-vapor permeabilities were improved with the addition of the clays. At 4wt% MEE loading, the oxygen and water-vapor permeabilities were reduced by 60 and 50%, respectively. Unlike the MEE-based blends, C20A-based compatibilized blends resulted in higher toughness than the neat PLA due to the lesser crystallinity of the PLA component and enhanced chain extensions/coupling in the C20A-based samples. Therefore, this work demonstrates the possibility of enhancing the thermal stability, toughness, and barrier properties of PLA in a one-stage process through reactive blending with PBSA in the presence of clays.
引用
收藏
页码:596 / 608
页数:13
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