A combined melt-stretching and quenching setup for experimental studies of polymer crystallization under complex flow-temperature environments

被引：4

作者：

Li, Hanchuan ^{[1
]}

Ye, Qiuyang ^{[1
]}

Sun, Jiahui ^{[1
]}

Cui, Shanlin ^{[1
]}

Zhang, Zhen ^{[1
]}

Liu, Chuntai ^{[1
]}

Shen, Changyu ^{[1
]}

Wang, Zhen ^{[1
]}

机构：

[1] Zhengzhou Univ, Natl Engn Res Ctr Adv Polymer Proc Technol, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2023年 / 94卷 / 01期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

SHEAR-ENHANCED CRYSTALLIZATION; ISOTACTIC-POLYPROPYLENE; HEAT-TRANSFER; IN-SITU; EXTENSIONAL VISCOSITY; PROCESSING CONDITIONS; SHISH; POLYETHYLENE; NUCLEATION; RHEOLOGY;

D O I：

10.1063/5.0130699

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A combined melt-stretching and quenching setup is designed and developed to allow experimental investigations of polymer crystallization under the complex flow-temperature environments comparable to those encountered in the actual industrial processing. The melt-stretching proceeds by two drums rotating in the opposite directions with simultaneous recording of a stress-strain curve, where the Hencky strain and strain rate (& LE;233 s(-1)) are adjustable over a large range. After stretching, liquid N-2 is used as a cooling medium to quench the free-standing melt, which is sprayed directly to the deformed melt driven by an electric pump. To ensure a high cooling efficiency, a three-way solenoid valve is employed to execute a sequential control of the liquid N-2 flow direction to reduce the boil-off of liquid N-2 before entering the sample chamber. The melt cooling rate depends on the liquid N-2 flow rate controlled by a flow valve, which is up to 221 & DEG;C/s when quenching the isotactic polypropylene (iPP) melt with a thickness of 0.28 mm at 150 & DEG;C. Two independent temperature control modules are designed to meet the requirements of different stages of melt-stretching and quenching. To verify the capability of the setup, we have performed the melt-stretching and quenching experiments on iPP samples. The setup is demonstrated to be a valuable new tool to study polymer crystallization under coupled flow-cooling fields.

引用

页数：9

共 71 条

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