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New thermo‐molded biodegradable films based on sunflower protein isolate: aging and physical properties
Author(s) -
Orliac Olivier,
Silvestre Françoise
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200350718
Subject(s) - plasticizer , triethylene glycol , ethylene glycol , glycerol , materials science , absorption of water , polymer chemistry , polyol , chemical engineering , glass transition , composite material , contact angle , chemistry , organic chemistry , polymer , polyurethane , engineering
Smooth black films are obtained. Films plasticized with glycerol have the least stress at break, but show the highest strain at break (glycerol 33%: 6.7 MPa, 150%). The ethylene glycol family shows an increase in stress at break when the aliphatic chain length increases, while strain at break decreases. Lastly, a rigidification phenomenon of films occurs with the two plasticizers 1,2‐propanediol and ethylene glycol, which can be attributed to a loss of plasticizer (followed by HPLC). The triethylene glycol produces the most resistant films, with a great elasticity (TEG 33%: 9.5 Mpa, 100%). Moreover, the films produced with this plasticizer keep their properties during time, as good as films produced with glycerol. The water vapor permeabilities of all those films are low (in the region of 10 −12 g.m −1 .s −1 .Pa −1 ); even if contact angle measurements carried out with water show the hydrophilic character of the films surface. This last result is in agreement with the water uptake tests which show a loss of plasticizer and an absorption of water (in the region of 100% of the dry matter of film); without considering the plasticizer nature, and this in spite of a nearly total insolubility of the crosslinked proteic network.