Molecular weight distribution shape approach for simultaneously enhancing the stiffness, ductility and strength of isotropic semicrystalline polymers based on linear unimodal and bimodal polyethylenes

Long, Chuanjiang1,3; Dong, Zhen1; Wang, Keqiang1; Yu, Feng1; He, Chaobin3,4; Chen, Zhong-Ren1,2

2023-05-09

10.1016/j.polymer.2023.125936

POLYMER   影响因子和分区

0032-3861

1873-2291

Bimodal polyethylenes (PEs) have captured broad attention in recent years, while little is known about the contribution of bimodal molecular weight distribution (MWD) shape on their properties compared with unimodal MWD shape. In this work, a comparative investigation of MWD shape-mechanical property relationship of isotropic semicrystalline polymers based on linear unimodal and bimodal PEs has been carried out. This first systematic study indicates that MWD shape influences the chain arrangements in crystalline and amorphous phases which affect their mechanical performance. PEs with bimodal shape exhibit higher crystallinity, lower entanglements and higher fraction of tie molecules than unimodal shape, contributing to simultaneously enhanced Young's modulus, yield strength, elongation at break and tensile strength. This work demonstrates that the modulation of MWD from unimodal to bimodal shape could overcome the trade-off among stiffness, strength and ductility of semicrystalline polymers without altering chain structure, chemical composition or average molecular weight.

Unimodal Bimodal Molecular weight distribution shape Mechanical properties

SCI ; EI

英语

第一 ; 通讯

State Key Research Development Programme of China[2021YFB3800705] ; National Natural Science Foundation of China[22075124] ; Shenzhen Special Fund["JCYJ20190809115013348","JCYJ20210324103811030"] ; Guangdong Provincial Key Laboratory of Catalysis[2020B121201002]

Polymer Science

Polymer Science

WOS:000983547700001

ELSEVIER SCI LTD

20231714018721

Crystallinity ; Ductility ; Economic and social effects ; Elastic moduli ; Polyethylenes ; Stiffness ; Tensile strength

Organic Polymers:815.1.1 ; Atomic and Molecular Physics:931.3 ; Crystalline Solids:933.1 ; Materials Science:951 ; Social Sciences:971

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Grubbs Inst, Dept Chem, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Catalysis, Shenzhen 518055, Peoples R China
3.Natl Univ Singapore NUS, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore
4.ASTAR, Inst Mat Res & Engn, Innovis, 2 Fusionopolis Way, Singapore 138634, Singapore

Long, Chuanjiang,Dong, Zhen,Wang, Keqiang,et al. Molecular weight distribution shape approach for simultaneously enhancing the stiffness, ductility and strength of isotropic semicrystalline polymers based on linear unimodal and bimodal polyethylenes[J]. POLYMER,2023,275.

Long, Chuanjiang,Dong, Zhen,Wang, Keqiang,Yu, Feng,He, Chaobin,&Chen, Zhong-Ren.(2023).Molecular weight distribution shape approach for simultaneously enhancing the stiffness, ductility and strength of isotropic semicrystalline polymers based on linear unimodal and bimodal polyethylenes.POLYMER,275.

Long, Chuanjiang,et al."Molecular weight distribution shape approach for simultaneously enhancing the stiffness, ductility and strength of isotropic semicrystalline polymers based on linear unimodal and bimodal polyethylenes".POLYMER 275(2023).