Biodegradable trays of thermoplastic starch/poly (lactic acid) coated with beeswax

被引：59

作者：

Reis, Monica Oliveira ^{[1
]}

Olivato, Juliana Bonametti ^{[2
]}

Bilck, Ana Paula ^{[1
]}

Zanela, Juliano ^{[3
]}

Eiras Grossmann, Maria Victoria ^{[1
]}

Yamashita, Fabio ^{[1
]}

机构：

[1] Univ Estadual Londrina, Ctr Ciencias Agr, Dept Ciencia & Tecnol Alimentos, POB 10011, BR-86057970 Londrina, PR, Brazil

[2] Univ Estadual Ponta Grossa, Dept Ciencias Farmaceut, BR-84030900 Ponta Grossa, PR, Brazil

[3] Univ Tecnol Fed Parana, Secretaria Licenciaturas & Bacharelados, BR-85660000 Dois Vizinhos, PR, Brazil

来源：

INDUSTRIAL CROPS AND PRODUCTS | 2018年 / 112卷

关键词：

Biodegradable material; Extrusion; Coating; POLY(LACTIC ACID); CASSAVA STARCH; MECHANICAL-PROPERTIES; FILMS; EXTRUSION; CHITOSAN; BLENDS; SHEETS; ADIPATE-CO-TEREPHTHALATE); PLASTICIZATION;

D O I：

10.1016/j.indcrop.2017.12.045

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Biodegradable trays of thermoplastic starch (TPS)/poly (lactic acid) (PLA) blends were produced by flat extrusion, calendering, and thermopressing. The trays were coated by immersion in beeswax (BW) emulsion (1, 2, and 3 g BW/100 g ethyl alcohol + Tween 80 solution) to improve their barrier properties. The trays coated with 1% BW had the higher tensile strength (11.5 +/- 1.0 MPa), and the lower solubilization capacity in water (22.8 +/- 0.8%) and trays coated with higher BW content emulsion decreased their tensile strength, stiffness, and water vapor permeability (from 7.9 to 0.2 x 10(-11) g/m.s.Pa). It was possible to produce TPS/PLA biodegradable trays by flat extrusion, calendering and thermopressing, with adequate mechanical properties and processability to be produced in large scale. The coating with beeswax is an interesting technique for reducing the water vapor permeability of hygroscopic biodegradable materials.

引用

页码：481 / 487

页数：7

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