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Citation: GAO Ying, YIN Jing-Hua. Morphology, Structure and Properties of In-situ Compatibilized LLDPE/PS Blends[J]. Chinese Journal of Applied Chemistry, ;2002, 19(9): 822-826. shu

Morphology, Structure and Properties of In-situ Compatibilized LLDPE/PS Blends

GAO Ying ,
YIN Jing-Hua ^,

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: YIN Jing-Hua,
Received Date: 17 January 2002
Available Online: 26 April 2002
Fund Project: 国家重大基础研究规划项目(973)(G1999064806) (973)(G1999064806)

Blends (LLDPE/PS) of linear low density polyethylene(LLDPE) with polystyrene(PS) were prepared by a reactive extrusion method. In order to increase the compatibility of two blending components, a kind of Lewis acid catalyst, AlCl₃, was adopted to initiate the Friedel-Crafts alkylation reaction between blending components. Due to the fact that in-situ generated LLDPE-g-PS copolymer could act as a compatibilizer in the relative blending system, the mechanical properties of LLDPE/PS system were greatly improved. For example, after compatibilization the Izod impact strength of a LLDPE/PS blend(80/20, by mass) was increased from 88.5 J/m to 401.6 J/m and its elongation-at-break increased from 370% to 790%. The Raman spectra of the LLDPE/PS blends extracted with tetrahydrofuran verified that LLDPE segments were grafted to the para-position of benzene rings of PS, which suggested that Friedel-Crafts alkylation did happen during reactive extrusion blending. SEM micrographs showed that the size of domains was decreased from 4~5 μm to less than 1 μm depending upon the mas fraction of AlCl₃ added. The crystallization behavior of LLDPE/PS blend was investigated by DSC. The fractionated crystallization phenomena were noticed, which could be mainly attributed to the confined crystallization rather than the reduction of the size of LLDPE domains.
- linear low density polyethylene,
- polystyrene,
- Friedel-Craft alkylation,
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