Study on Tensile Rheological Properties of Polyethylene Melt

doi:10.19491/j.issn.1001-9278.2021.01.003

Abstract

Abstract:

The rheological properties of three types of polyethylene resins with different molecular chain structures were investigated by using a rotary rheometer （sentmanat extensional rheometer） and a melt tensile rheometer. These rheological properties include melt transient tensile viscosity， melt tensile strength and tensile viscosity. The results indicated that the growth of the transient tensile viscosity of PE-HD-100N melt tended to slow down gradually with an increase in the Hencky deformation. There was an obvious transient tensile hardening phenomenon appearing in PE-LD-2420F， and the tensile viscosity of its melt increased sharply. The tensile viscosity of the melt of PE-LLD-7050 was low， and it began to decrease after the rapid formation of the platform. The test result of melt tensile indicated that the melt strength and tensile viscosity of PE-HD-100N were higher than those of PE-LD-2420F and PE-LLD-7050. PE-LLD-7050 presented the lowest melt strength and tensile viscosity.

Key words: polyethylene, tensile rheology, tensile viscosity, processing performance

CLC Number:

TQ 325.1⁺2

WANG Fan, MA Zongli, DU Bin, LI Wen, WANG Duopeng, CHEN Shangtao, WANG Yanfang. Study on Tensile Rheological Properties of Polyethylene Melt[J]. China Plastics, 2021, 35(1): 13-18.

Figures/Tables 9

样品	测试温度/℃	载荷/kg	熔体流动速率/g·(10 min)^-1
100N	190	5.00	0.22
2420F	190	2.16	0.78
7050	190	2.16	2.1

Tab.1. Melting flow rate of the PE?LD

样品

重均相对分子质量（M_w）/

×10⁴ g·mol^-1

数均相对分子质量(M_n)/

×10⁴ g·mol^-1

M_w/M_n

Tab.2. Relative molecular mass and relative molecular mass distribution of test samples

Fig.1. Molecular weight distribution profiles of polyethylene samples

Fig.2. Transient tensile viscosity of 100N and time curves

Fig.3. Transient tensile viscosity of 2420F and time curves

Fig.4. Transient tensile viscosity of 7050 and time curves

Fig.5. Transient tensile viscosity of 100N, 2420F and 7050 and time curves with tensile rate of 1 s-1

Fig.6. Melt strength of polyethylene samples against tensile ratio

Fig.7. Tensile viscosity of polyethylene samples against tensile rate

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