Melt extrudate swell behavior of POM/EVA/HDPE/nano-CaCO3 composites

被引：9

作者：

Liang, Ji-Zhao ^{[1
]}

机构：

[1] S China Univ Technol, Sch Mech & Automot Engn, Res Div Green Funct Mat & Equipment, Guangzhou 510640, Peoples R China

来源：

JOURNAL OF POLYMER ENGINEERING | 2013年 / 33卷 / 01期

关键词：

extrudate swell; melt viscoelasticity; polymer-matrix composites; POM; CAPILLARY EXTRUSION; FRACTIONATED CRYSTALLIZATION; MECHANICAL-PROPERTIES; ELASTIC BEHAVIOR; POLYMER MELTS; DENSITY; BLENDS; MORPHOLOGY; FLOW; DIE;

D O I：

10.1515/polyeng-2012-0084

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Polyformaldehyde (POM)/ethylene-vinyl acetate copolymer (EVA)/high-density polyethylene (HDPE) composites filled with nanometer calcium carbonate (nano-CaCO3) were prepared using a twin-screw extruder. The effects of load and temperature on the melt extrudate swell behavior of the composites were investigated, by using a melt flow rate instrument under experimental conditions, with temperatures ranging from 170 degrees C to 220 degrees C and loads varying from 1.2 kg to 12.5 kg. The results showed that the melt die-swell ratio (B) of the composites decreased linearly with a rise of temperature as the load was fixed, while it increased nonlinearly with increase in the melt volume flow rate (MVR) and load, when the test temperature was constant; they also showed that B is a quadratic function of shear rate or shear stress. The value of B increased nonlinearly with an increase of the HDPE weight fraction (phi) as the temperature was constant, and the temperature sensitivity of B to phi was insignificant, while the effect of load was significant. The correlation between B and phi obeyed a quadratic equation.

引用

页码：19 / 26

页数：8

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