Biodegradable Carboxymethyl Cellulose Films Modified by Polyvinyl Alcohol and Cellulose Nanowhiskers:(2) Thermal, Water Vapor Permeability and Surface Hydrophilicity Properties

Aboulghasemi, Leila; Ghanbarzadeh, Babak; Dehghannia, Jalal; Entezami, Ali Akbar

doi:10.22059/ijbse.2012.35208

Biodegradable Carboxymethyl Cellulose Films Modified by Polyvinyl Alcohol and Cellulose Nanowhiskers:(2) Thermal, Water Vapor Permeability and Surface Hydrophilicity Properties

Document Type : Research Paper

Authors

Leila Aboulghasemi

Babak Ghanbarzadeh

Jalal Dehghannia

Ali akbar Entezami

10.22059/ijbse.2012.35208

Abstract

Carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVOH) blend film was produced through casting. Cellulose Nanowhisker (CNW) was produced by means of acid hydrolysis of cotton linter and CMC-PVOH-cellulose nanowhiskers through which fully degradable bionanocomposites were prepared. Prepared nanowhisker suspension contained rod like particles averaging lengths of 240 nm and diameters of 13 nm. An amount of 6.40% reduction in water vapor permeability (WVP) and 9.31% enhancement in initial contact angle were achieved through a 10% Wt PVOH addition in the CMC film. Differential Scanning Calorimetery (DSC) results indicated that the addition of PVOH induces an increase in melting point of the CMC film. A 28.21% reduction in WVP was observed at 10% Wt CNW content as compared with blend film. The sample containing 7% CNW, exhibited the lowest surface hydrophilicity (Contact Angle = 59.28^o). Glass temperatures (T_g) of the blend film and bionanocomposite film of 3% CNW were recorded as 164.3^oC and 167.8^oC, respectively. Through an addition of 7% CNW in the blend film, a reduction of 7.2^oC in the melting point was observed.

Keywords

Blend film

Bionanocomposite

Water vapor permiability

Surface hydrophilicity

Thermal properties