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Modification of zein films by incorporation of poly(ethylene glycol)s
Author(s) -
Tillekeratne Mangala,
Easteal Allan J
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(200001)49:1<127::aid-pi320>3.0.co;2-b
Subject(s) - differential scanning calorimetry , materials science , dynamic mechanical analysis , glass transition , ultimate tensile strength , absorption of water , ethylene glycol , composite material , peg ratio , thermal analysis , tensile testing , chemical engineering , polymer chemistry , polymer , thermal , thermodynamics , physics , finance , engineering , economics
The thermal and mechanical properties of corn (maize) (CZ) films plasticized with poly(ethylene glycol) (PEG) of two different molar masses (400 and 1000 g mol −1 ) were studied using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), tensile strength, moisture absorption isotherms and water vapour transmission rate measurements. The glass transition temperature ( T g ) of plasticized films is determined primarily by the amount of moisture contained in the film. DMTA data show contraction of films with loss of absorbed water during heating/cooling cycles. The moisture absorption behaviour of films plasticized with PEG400 and PEG1000 is similar at low relative humidities but significantly different at higher relative humidities. Incorporation of up to about 30 wt% PEG substantially enhances the tensile strength and the resistance to water vapour transmission of the protein film, and PEG1000 is more effective than PEG400. © 2000 Society of Chemical Industry