i am doing research in fibre reinforced plastic
i am having problem with elasticity in starch polymer
For increasing plasticity, you need plasticizers ... Usual plasticizers for starch are water (the natural one), glycerol, ethanolamine, formamide, ethylene glycol, sorbitol, le xylitol, triethyl citrate, sucrose, stearic acid, polyethylene glycol, etc. You can go through these papers:
K. Krogars, J. Heinämäki, M. Karjalainen, A. Niskanen, M. Leskelä, and J. Yliruusi, "Enhanced stability of rubbery amylose-rich maize starch films plasticized with a combination of sorbitol and glycerol," International Journal of Pharmaceutics, vol. 251, no. 1–2, pp. 205–208, 2003.
M. Huang, J. Yu, and X. Ma, "High mechanical performance MMT-urea and formamide-plasticized thermoplastic cornstarch biodegradable nanocomposites," Carbohydrate Polymers, vol. 63, no. 3, pp. 393–399, 2006.
F. J. Rodriguez-Gonzalez, B. A. Ramsay, and B. D. Favis, "Rheological and thermal properties of thermoplastic starch with high glycerol content," Carbohydrate Polymers, vol. 58, no. 2, pp. 139–147, 2004.
But plasticization also requires mechanical energy, so using an extruder with a suitable screw profile is an excellent way of doing it in the presence of the aforementioned plasticizers.
Alain
For increasing plasticity, you need plasticizers ... Usual plasticizers for starch are water (the natural one), glycerol, ethanolamine, formamide, ethylene glycol, sorbitol, le xylitol, triethyl citrate, sucrose, stearic acid, polyethylene glycol, etc. You can go through these papers:
K. Krogars, J. Heinämäki, M. Karjalainen, A. Niskanen, M. Leskelä, and J. Yliruusi, "Enhanced stability of rubbery amylose-rich maize starch films plasticized with a combination of sorbitol and glycerol," International Journal of Pharmaceutics, vol. 251, no. 1–2, pp. 205–208, 2003.
M. Huang, J. Yu, and X. Ma, "High mechanical performance MMT-urea and formamide-plasticized thermoplastic cornstarch biodegradable nanocomposites," Carbohydrate Polymers, vol. 63, no. 3, pp. 393–399, 2006.
F. J. Rodriguez-Gonzalez, B. A. Ramsay, and B. D. Favis, "Rheological and thermal properties of thermoplastic starch with high glycerol content," Carbohydrate Polymers, vol. 58, no. 2, pp. 139–147, 2004.
But plasticization also requires mechanical energy, so using an extruder with a suitable screw profile is an excellent way of doing it in the presence of the aforementioned plasticizers.
Alain
read this link
http://www.chem.ucalgary.ca/courses/351/laboratory/expt353_plastics.pdf
best regard
Mechanical properties of thermoplastic starch depend on few factors e.g. amount of plasticizer, amount of a filler and degree of dispersion in the polymer matrix , type of starch, extrusion parameters. Generally, fillers in TPS matrix affect elasticity decrease (elongation at break) of TPS materials. Meybe the amount of fiber is to high or plasticizer is to low. I don't recomend water as a plasticizer because it cause recrystalization of starch.
http://pubs.acs.org/doi/abs/10.1021/bm020065p
http://www.sciencedirect.com/science/article/pii/S0144861700003143
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