Effect of fiber treatments on tensile and thermal properties of starch/ethylene vinyl alcohol copolymers/coir biocomposites

被引：233
作者：
Rosa, Morsyleide F. [1 ,2 ]
Chiou, Bor-sen [1 ]
Medeiros, Eliton S. [1 ,3 ]
Wood, Delilah F. [1 ]
Williams, Tina G. [1 ]
Mattoso, Luiz H. C. [3 ]
Orts, William J. [1 ]
Imam, Syed H. [1 ]
机构：
[1] ARS, USDA, WRRC, Bioprod Chem & Engn Res Unit, Albany, CA 94710 USA
[2] Embrapa Agroind Trop, BR-60511110 Fortaleza, Ceara, Brazil
[3] Embrapa Instrumentacao Agropecturia, Lab Nacl Nanotecnol Agronegocio, BR-13560970 Sao Carlos, SP, Brazil
来源：
BIORESOURCE TECHNOLOGY | 2009年 / 100卷 / 21期
关键词：
Natural fibers; Coir fibers; Surface treatment; Biocomposites; Mechanical and thermal properties; COIR-POLYESTER COMPOSITES; TREATED JUTE FIBERS; MECHANICAL-PROPERTIES; NATURAL FIBERS; SURFACE-TREATMENT; ALKALI TREATMENT; COCOS-NUCIFERA; MATRIX; BEHAVIOR; SISAL;
D O I：
10.1016/j.biortech.2009.03.085
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Coir fibers received three treatments, namely washing with water, alkali treatment (mercerization) and bleaching, Treated fibers were incorporated in starch/ethylene vinyl alcohol copolymers (EVOH) blends. Mechanical and thermal properties of starch/EVOH/coir biocomposites were evaluated. Fiber morphology and the fiber/matrix interface were further characterized by scanning electron microscopy (SEM). All treatments produced surface modifications and improved the thermal stability of the fibers and consequently of the composites. The best results were obtained for mercerized fibers where the tensile strength was increased by about 53% as compared to the composites with untreated fibers, and about 33.3% as compared to the composites without fibers. The mercerization improved fiber-matrix adhesion, allowing an efficient stress transfer from the matrix to the fibers. The increased adhesion between fiber and matrix was also observed by SEM. Treatment with water also improved values of Young's modulus which were increased by about 75% as compared to the blends without the fibers. Thus, starch/EVOH blends reinforced with the treated fibers exhibited superior properties than neat starch/EVOH. Published by Elsevier Ltd.
引用
收藏
页码：5196 / 5202
页数：7
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