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Licensed Unlicensed Requires Authentication Published by De Gruyter 2016 (Print 1995)

Properties of Edam Copolymers as Polypropylene Resin Modifier

(Technical Report)

  • Renyuan Qian , Yuanze Xu , Yihong Chen , Deyan Shen , Xigao Jin , Liusheng Chen , Tadayuki Ohmae , Satoru Hosoda , Hisao Tanaka , Toshiro Masuda and Akio Nakajima

Abstract

The use of a copolymer of ethylene and N,N′-diethylaminoethyl methacrylate (EDAM) when melt blended into polypropylene (PP) to improve the dyeing properties of propylene fibres has been studied. It has been shown that when EDAM was heated in air, the oxygen in air accelerates the thermal decomposition of the DAM moiety of EDAM at 150°C, leaving polyethylene as the residue. However this heterogeneous reaction was not serious for the melt in extruder, in a capillary rheometer or in fibre spinning of PP/EDAM blends. Steady state viscosities of PP, PP/EDAM blends and EDAM under shear rates 10°–104 s–1 at 200°C and first normal stress differences under shear stresses of 3·102–104 Pa at 200°C were measured. Characteristics of the entrance flow to an orifice was measured using a die of length to diameter ratio L/D=0 in a capillary rheometer to estimate the elongational flow effects of these melts. The rheological behavior of PP/EDAM blends up to 20% EDAM resembles PP, while the PP/EDAM 50/50 blend resembles EDAM. Transmission electron microscopy of microtomed sections of the capillary extrudates of the PP/EDAM 80/20 blend and 50/50 blend showed clearly that the former has the morphology of EDAM islands in a PP sea while the latter the morphology of PP islands in an EDAM sea. For practical applications of EDAM modified PP fibres the EDAM content is less than 10%, such melt blends showed only a slight increase of viscosity. The dyeing behavior of EDAM modified PP fibres has also been studied. Two key chemicals which improve the dyeing properties of the EDAM modified PP fibres were found. One of them is sodium stearate. When it is added to the PP/EDAM blends for spinning, it accelerates the penetration of dyestuff into the fibre. The other is potassium salt of an alkylphosphate to be used as a dyebath auxiliary which improves color fastness and shows an antistatic finishing effect to the dyed fibre.

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