High-Throughput in Situ Characterization of Polymer Crystallization under an Intense Flow, High Pressure, and Cooling Gradient during Injection Molding

被引：16

作者：

Yin, Jin ^{[1
]}

Deng, Lu-Feng ^{[1
]}

Ma, Guo-Qi ^{[1
]}

Wu, Feng-Yang ^{[1
]}

Xu, Jia-Zhuang ^{[1
]}

Gao, Xueqin ^{[1
]}

Bian, Fenggang ^{[2
]}

Lei, Jun ^{[1
]}

Zhong, Gan-Ji ^{[1
]}

Li, Zhong-Ming ^{[1
]}

机构：

[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Peoples R China

[2] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

来源：

MACROMOLECULES | 2023年 / 56卷 / 11期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

BETA-NUCLEATING AGENT; ISOTACTIC POLYPROPYLENE; SUPERMOLECULAR STRUCTURE; MECHANICAL-PROPERTIES; HEXAGONAL PHASE; SHEAR-FLOW; POLYETHYLENE; MORPHOLOGY; CRYSTALS; KINETICS;

D O I：

10.1021/acs.macromol.3c00194

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Injection molding is a polymer-processing method widelyused, whichconsumes about one-third of global plastics and produces 80% of plasticparts. However, it is still challenging to in situ reveal the structuralevolution of polymers during injection molding, which is a long-standingobstacle to understand the relationship of processing-structure-property.This work has first built an in situ investigation system with theaid of a highly brilliant synchrotron X-ray and large experimentalspace with a length of 30 m, width of 8 m, and height of 6 m, allowingthe installation of an industrial-scale injection molding machine.Based on the characterization system, the fast millisecond-resolvedstructural evolution of general semicrystalline polymers is identified.Various structural types of information including crystallizationkinetics, polymorphism, and the growth and orientation of their lamellarcrystals under an actual environment of non-isothermal crystallizationwith a cooling gradient, intense flow, and high pressure during injectionmolding have been revealed for the first time. The high-throughputfeature of the system provides a vital prerequisite for the subsequentestablishment of a quantitative database of processing parameter-structure-performanceand the precise regulation of polymer aggregation structures, whichis valuable for the digitalization and intelligence of the developmentof the injection molding industry and integration into the IndustrialInternet.

引用

页码：4111 / 4122

页数：12

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