Preparation of Biodegradable Low Density Polyethylene by Starch – Urea Composition for Agricultural Applications

Document Type: Research Article

Authors

1 Faculty of Engineering, University of Tehran, P.O.Box 17665-351 ,Tehran , I.R. IRAN

2 Faculty of Engineering, University of Tehran , P.O.Box 17665-351 ,Tehran , I.R. IRAN

Abstract

It has been proven that polyolefins specially low density polyethylene (LDPE), are resistant against degradation and microorganism attacks; Thus, one of the most important properties of industrial plastics, is their environmental biodegradability. Since plastics are being widely used in agriculture, horticulture and packaging, meeting this requirement becomes increasingly dificult (specially in IRAN as one of the biggest manufacturers of polyethylene materials).So, attention is focussed on production  of  biodegradable polyethylene. In this study, some different formulations based on starch and urea for making polyethylenes which are biodegradable in soil and moist media, have been investigated. The compounds produced are injection molded, and tested under natural conditions and their biodegradability has been studied. It has been thus possible to produce a biodegradable low-density polyethylene which is environmentally biodegradable material that is suitable for agriculture and packaging applications.

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[1] Cole. M. A, American chemical society,Washington, Agricultural of synthetic polymers;biodegradablity of utilization, ACS sympium series no.433, (1990).

[2] Dubios, R., Applied science publishers,ltd, London, “Plastics in agriculture”, (1978).

[3] G22 q 21,ASTM., Standard practice for Determining resistance of plastics to bacteria.

[4] Krosh wilz, J.L., Encyclopedia  of polymer science & technology, 2, p. 1230 (1985).

[5] wool, Rp., Cole, M.A., and peanasky, J.S., American chemical society, Torento, June “Biodegradation & Biodisintegration of polymer-starch blends”, (1988).

[6] Bastioli, C., Belloti, V., and lombi, R., PCT int, pat, “Expanded products of biodegradable plastics & a method for their production”, April (1991).

[7] Manchester packaging company D-grad@degradable polyethylene (manchesterpkg.com)

[8] Anderson et.al. US patents 6,231,970; Thermoplastic starch compositions incorporating a particulate filler, May (2001).

[9] Yoo & yukong. Us patent 5,461,093 ; Biodegradable polyethylene composition chemically bonded with starch & a process for preparing thereof, (1995).

[10] Akaranta, O., Oku. G.E., Carbohydrate polymers 34 “some properties of cassava mesocarp carbohydrates – LDPE blends”, p. 403, (1997).

[11] Boembergen et al., Us patent 5, 462, 983; Biodegradable moldable products & films comprising blends of starch esters, Oct. (1995).

[12] Austin, R.G., Us patent 5,281,681; Photodegradable & Biodegradable polyethylene, Oct. (1991).

[13] Otera et al., Us patent 6,114,496 ; Biodegradable resin composition & preparation process thereof, Set. (2000).

[14] Willett,J.L., Us patent 5,087, 650; Biodegradable plastics, Feb. (1992).

[15] Loercks et al., Us patent 6, 235, 815; Biodegradable polymeric mixtures based on thermoplastic starch, May (2001).

[16] D.M.Wiles et al., Biodegradable plastics ’99 conference, Frankfurt, Germany. Biodegradable films from PE, April (1999).