Dynamic rheological behavior and compatibility of polyethylene/paraffin oil blends

doi:10.19491/j.issn.1001-9278.2022.02.003

Abstract

Abstract:

Two types of polyethylene （PE） with relatively different molecular weights were blended with paraffin oil （LP） separately to form two blending systems. The effects of temperature and LP content on the dynamic rheological behavior of the blend systems as well as their compatibility and microporous structure were investigated using rotating rheometer， polarizing microscope， differential scanning calorimeter and scanning electron microscope. The results indicated that the energy storage modulus， loss modulus， complex viscosity and relaxation time of PE/LP blend decreased with an increase in temperature and PL content. The compatibility between the two phases in the blend system is strongly associated with to the molecular weight of PE. The Cole?Cole curve based on the PE1 with a low molecular weight and LP system is semicircular， and the slope of the Han curve is 1.36. There is no monotectic point in the phase diagram. When the Cole?Cole curve based on the PE2 and LP system with a larger molecular weight has linear characteristics， the Han curve presented a slope of 1.2. There is an obvious monotectic point in the binary phase diagram， corresponding to the PE mass fraction （φ_m） of 46 wt%. This indicated that the compatibility of the former system was better than that of the latter one， and however both blend systems were molten homogeneous at a high temperature. The PE1/LP blend system was mainly involved in the solid?liquid phase separation. When the mass fraction of PE is lower than φ_m， the liquid?liquid phase separation mainly occurred in the PE2/LP system， resulting in a "honeycomb" porous structure.

Key words: polyethylene, paraffin oil, rheological property, compatibility

CLC Number:

TQ325.1⁺2

HENG Yue, XUE Nanxiang, CHEN Zhuangxin, LEI Caihong, XU Ruijie. Dynamic rheological behavior and compatibility of polyethylene/paraffin oil blends[J]. China Plastics, 2022, 36(2): 13-18.

Figures/Tables 8

Fig.1. Dynamic frequency scanning curves of PE/LP systems with different LP contents

LP含量/%	共混体系
LP含量/%	PE1/LP	PE2/LP
10	5.2	0.10
20	6.3	0.16
30	8.1	0.25
40	10.0	0.63
50	15.8	1.58
60	25.1	10.00

Tab.1. Crossover frequency of PE/LP blend systemt

Fig.2. Viscosity curves of PE/LP systems

Fig.3. Dynamic frequency scanning curves of PE/LP60 system at different temperature

Fig.4. Cole?Cole curves of the blending systems

Fig.5. Han curves of the blending systems

Fig.6. Binary phase diagrams of the blending systems

Fig.7. Microstructure of hot?pressed films made of different blends

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