การพัฒนากระถางต้นไม้ชีวภาพจากพอลิเมอร์คอมโพสิตเทอร์โมพลาสติกสตาร์ช/ ผักตบชวา/เปลือกถั่วลิสง

Pimpanitpa Kunthadong; Ratthaphat Bunkerd; Chatrachatchaya Chotichayapong; Panida Sawadee

Authors

Pimpanitpa Kunthadong Program of Applied Chemistry, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan Nakhon Ratchasima Campus, Mueang, Nakhon Ratchasima 30000, Thailand.
Ratthaphat Bunkerd Program of Applied Chemistry, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan Nakhon Ratchasima Campus, Mueang, Nakhon Ratchasima 30000, Thailand.
Chatrachatchaya Chotichayapong Program of Applied Chemistry, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan Nakhon Ratchasima Campus, Mueang, Nakhon Ratchasima 30000, Thailand.
Panida Sawadee Program of Applied Chemistry, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan Nakhon Ratchasima Campus, Mueang, Nakhon Ratchasima 30000, Thailand.

Keywords:

biodegradable pots, bio-composites, thermoplastic starch, peanut hulls, water hyacinth

Abstract

This study prepared a biodegradable polymer composite for a prototype plant bio-pot from thermoplastic starch (TPS), poly (L-lactide) (PLL), reinforced with water hyacinth (WH) and peanut hulls (P) through a melt forming process. The TPS compounds were prepared from native tapioca starch using a plasticizer mixture consisting of glycerol and other plasticizers in a 2:1 weight ratio. The mixture included glycerol/sorbitol (GS), glycerol/urea (GU) and glycerol/distilled water (GW), and were complared with glycerol (Gly) alone. The results showed that plastic sheet from TPS_GS has tensile mechanical properties, thermal stability, and water resistance better than other TPS compounds. When TPS_GS was reinforced with water hyacinth fiber and peanut shell (WHP) at 10 % by weight and 5 phr PLL was added as an additive (90TPS_GS/10WHP+5PLL), the tensile and water absorption properties of the composite sheets were studied. It appeared that the reinforcement with 10% WHP by weight increased the elongation at break to 20.39%, while also reducing water absorption and improving the stability of the plastic sheet during testing. Additionally, the polymer composites can be formed into conical plant pots using a vertical ram extruder. The resulting plant pots exhibited a dark brown color with creamy streaks evenly distributed throughout, a smooth surface texture and morphology stability. They are suitable for use as small plant pots.

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