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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 6, Number 1
February 20, 1962 

Studies on Photosensitive Resins.-Molecular Weight Determination of Isophthalic Acid-Cinnamic Acid-Glycerine Polycondensates

감광성수지에 관한 연구-Isophthalic acid-Cinnamic acid-Glycerine 계축중합물의 분자량에 관하여
Jyong Sup Shim, Boo Sup Lee

심정섭, 이부섭
The polycondensates of isophthalic acid-cinnamic acid-glycerine system were synthesized. The molecular weights of these products were determined by two methods, viscosity method and osmotic pressure methods. In the synthesis of resin, the reaction temperature was kept at 232℃ and the mole ratio of the reactants was chosen as follows: Glycerine ;1.0 Isophthalic acid ;1.0 Cinnamic acid ;2.8 Excessive cinnamic acid prevented gelation of reaction mixtures. As the solution became very dilute, reduced osmotic pressure P/C (at the concentration of solution below 0.24g/100 ml of acetone) and reduced viscosity ηsp/C (at the concentration of solution below 0.32 g/100 ml of acetone) increased rapidly. The correspondence between molecular weights determined by the two methods made Huggin's equation applicable to the prepared polymer. The values of K and a are 2.77×10-5 and 1.063, respectively.
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