Starch is a hydrophilic polymer and chloroform is organic solvent with polarity index of 4.1. The literature mentioned that starch is not soluble in alcohol, in which the polarity index is within 3.9-4. However, starch can dissolve well in hot water (PI 10.2) instead of cold water. Another literature, dissolved starch in chloroform below the chloroform boiling temperature (60 deg. Celcius). Hope someone can explain further regarding this matter and is the application of the temperature assist the solubility. Thank you in advance!
The modified starch gave some hints. Thinking to do some blending, however found a literature that using this method (in Chloroform assist by the temperature). So, wondering the way it react, thought it maybe possible as starch has many hydroxyl group. Other way, chloroform not dissolve the starch but dissolving another polymer and heat assist the chemical bonding with the starch. Hope someone can clarify this..
Solvents for starch are 90% aqueous DMSO, DMSO with little LiCl, DMF with LiCl or some ionic liquids. It is completely insoluble in CHCl3.
Thank you Sir! Starch is polar and chloroform is non-polar. So chloroform is not possible to dissolve starch. Found another literature, the group blend the starch and the polymer with 5% of chloroform solution, means 95% of water volume with 5% of chloroform. However, the results came out that the polymers are not miscible with some changes with the properties. Wonder whether this is acceptable as polymer blending.
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