Chain-extension of Poly ( lactic acid ) with Diisocyanate by Reactive Extrusion and Properties of the Resultant#br#

Abstract

Abstract: Poly(lactic acid )(PLA)was prepared via solution method and was chain extended with methylenediphenyl diisocyanate in a twin screw extruder. The effect of different NCO/OH mol ratios on molecular weight, thermal characteristics, and mechanical properties was studied. It showed that it was feasible to prepare high molecular weight PLA by twin-screw chain extension. The viscosity-average molecular weight of PLA was increased from 9 .19X10⁴to23.6 X 10⁴ during the chain extending and the tensile strength became nearly 2 times higher.

Key words: poly(lactic acid), methylenediphenyl diisocyanate, reactive extrusion, chain extension

CLC Number:

TQ323.4

MAO Wei, TANG Song-chao, WANG Qing-hai, PAN Yong-kang, WANG Ting-lan. Chain-extension of Poly ( lactic acid ) with Diisocyanate by Reactive Extrusion and Properties of the Resultant#br#[J]. China Plastics, 2007, 21(2): 17-22.

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Chain-extension of Poly ( lactic acid ) with Diisocyanate by Reactive Extrusion and Properties of the Resultant#br#

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