Research articles
ScienceAsia 49S (2023):ID 23-31 |doi:
10.2306/scienceasia1513-1874.2023.s006
Effects of additives on properties of PVA film for agricultural
applications
Supanut Phattarateeraa,b, Li Xina, Kanyarat Kaewphenga, Tatcha Kriangburananana, Poonsub Threepopnatkula,*
ABSTRACT: This research investigates the influence of additives-namely, glycerol (20%, 30%, and 40% wt), ZnO (0
and 1 phr), and coffee extract (0%, 5%, 7.5%, and 10% phr)-on the properties of poly(vinyl alcohol) (PVA) film.
The composite samples were prepared by blending using a twin-screw extruder and shaping through compression
molding. The addition of glycerol yielded increased water solubility, while a higher glycerol content resulted in
reduced water absorption. Concurrently, the glass transition temperature (Tg
), melting temperature (Tm), and
crystallinity (Xc
) exhibited a decrease, leading to diminished tensile strength but elevated elongation at break. A notable
linear relationship between glycerol content and film crystallinity was observed. The incorporation of ZnO reduced
water solubility and absorption, enhancing tensile strength and elongation due to improved Xc and stress-transfer
characteristics. Conversely, the presence of coffee extract increased water solubility and absorption, yet substantially
compromised film strength and toughness by diminishing Xc and causing microstructure collapse. The findings suggest
the potential use of PVA composite films for seedling planting, with tailored properties achieved through additive
manipulation.
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| a |
Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology,
Silpakorn University, Nakhon Pathom 73000 Thailand |
| b |
National Metal and Materials Technology Center, National Science and Technology Development Agency,
Thailand Science Park, Pathum Thani 12120 Thailand |
* Corresponding author, E-mail: threepopnatkul_p@su.ac.th
Received 17 Jan 2023, Accepted 11 Sep 2023
|
