Abstract：
:Well known aging problems with rubbery starch films are the migration of plasticizer and increased crystallinity leading to embrittlement. The effects of a combination of sorbitol and glycerol used as plasticizers on mechanical, moisture permeability and solid-state properties of rubbery amylose maize starch (Hylon VII) films were studied. The films were prepared by casting and were exposed to conditions of 25 degrees C/60% relative humidity (RH) and 40 degrees C/75% RH for 9 months. The starch films plasticized with a combination of sorbitol and glycerol (1:1) at equal amount to the polymer weight, were shown to be the most stable alternative of the studied films during the 9 months storage period. The water vapor transmission (WVTR) of the films did not change during the period of storage and neither did the elongation at break, but the tensile strength increased. X-ray diffraction (XRD) results showed that during storage no crystallization had occurred. The combination of sorbitol and glycerol prevented the migration of the plasticizer molecules out of the film.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Krogars K,Heinämäki J,Karjalainen M,Niskanen A,Leskelä M,Yliruusi Jdoi
10.1016/s0378-5173(02)00585-9keywords:
subject
Has Abstractpub_date
2003-01-30 00:00:00pages
205-8issue
1-2eissn
0378-5173issn
1873-3476pii
S0378517302005859journal_volume
251pub_type
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