Evaluation of Photodegradation in LDPE/modified Starch Blends

被引：11

作者：

Ferreira, Flavia G. D. ^{[1
]}

Lima, Maria A. G. A. ^{[1
]}

Almeida, Yeda M. B. ^{[1
]}

Vinhas, Gloria M. ^{[1
]}

机构：

[1] Univ Fed Pernambuco, Dept Engn Quim, BR-50740521 Recife, PE, Brazil

来源：

POLIMEROS-CIENCIA E TECNOLOGIA | 2009年 / 19卷 / 04期

关键词：

Photodegradation; polymer blends; polyethylene; starch; POLYETHYLENE; RADIATION; IRRADIATION; DEGRADATION; CELLULOSE;

D O I：

10.1590/S0104-14282009000400011

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Photodegradation of LDPE/modified starch blends 80/20 m/m has been examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (DRX) before and after exposure to ultraviolet radiation (UV). Samples were exposed to UV in the laboratory for periods of 6, 24, 48 and 60 hours. The main alteration in the polymeric material after exposure to the radiation was a decrease in the mechanical properties, tensile strength and elongation. There were also changes in the chemical structure of the blend with ill increase in the carbonyl and vinyl indices, 65.58 and 53.29%, respectively. The analysis of the blend crystallinity pointed to the formation of a new crystalline symmetry that did not exist before the irradiation.

引用

页码：313 / 317

页数：5

共 23 条

[1] Effects of increased solar ultraviolet radiation on materials [J].

Andrady, AL ;

Hamid, SH ;

Hu, X ;

Torikai, A .

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY, 1998, 46 (1-3) :96-103

[2]

[Anonymous], 2003, ANN BOOK ASTM STAND

[3]

[Anonymous], 1998, BIOPOLYMERS RENEWABL

[4] Biodegradable films made from low-density polyethylene (LDPE), rice starch and potato starch for food packaging applications: Part 1 [J].

Arvanitoyannis, I ;

Biliaderis, CG ;

Ogawa, H ;

Kawasaki, N .

CARBOHYDRATE POLYMERS, 1998, 36 (2-3) :89-104

[5]

Arvanitoyannis IS, 1999, J MACROMOL SCI R M C, VC39, P205

[6]

Canevarolo Jr. S.V., 2003, TECNICAS CARACTERIZA

[7]

CARLSSON DJ, 1976, J MACROMOL SCI R M C, VC 14, P65

[8] Bioartificial polymeric materials based on polysaccharides [J].

Cascone, MG ;

Barbani, N ;

Cristallini, C ;

Giusti, P ;

Ciardelli, G ;

Lazzeri, L .

JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION, 2001, 12 (03) :267-281

[9] The Biodegradation of Polyhydroxybutyrate-co-valerate/Amphiprotic Starch in the Presence of Microorganisms [J].

Coelho, Nadjane S. ;

Almeida, Yeda M. B. ;

Vinhas, Gloria M. .

POLIMEROS-CIENCIA E TECNOLOGIA, 2008, 18 (03) :270-276

[10]

ELRAHIM HAA, 2004, J PHOTOCHEMICAL PH A, V163, P547

← 1 2 3 →