Chain Shuttling Polymerization for Cycloolefin Block Copolymers: From Engineering Plastics to Thermoplastic Elastomers

Qiu, Nanting1,2; Sun, Zhiqiang1,2; Yu, Feng1,2; Wang, Keqiang1,2; Long, Chuanjiang1,2; Dong, Zhen1,2; Li, Yuanzhi1,2; Cao, Kun3,4; Chen, Zhong-Ren1,2,5

2024-06-13

10.1021/acs.macromol.4c01029

MACROMOLECULES   影响因子和分区

0024-9297

1520-5835

Chain shuttling polymerization is a powerful approach for efficiently producing olefin block copolymers via simple one-pot polymerization. Herein, this method was used to synthesize ethylene-norbornene cycloolefin block copolymers (COBCs). Two bis(salicylaldiminato)titanium complexes with different monomer selectivities were used to generate alternating hard and soft blocks of high and low norbornene incorporation, respectively, in the presence of chain shuttling agents (diethyl zinc). The high glass transition temperature (T-g) of the hard blocks contributed to their high tensile strength, while the low T-g of the soft blocks led to their high ductility. By varying the concentration of norbornene during the copolymerization process, it is possible to tune the T-g values of the hard and soft blocks, thus achieving a transition in the mechanical properties of the COBCs from typical elastomers to plastics while maintaining high ductility and transparency. Compared with random cycloolefin copolymer plastics, the COBC in this study exhibited a 55-fold increase in elongation at break and maintained comparable tensile strength. This study highlights the development of a new class of chain shuttling catalytic systems to produce COBCs with widely tunable T-g values to modulate their mechanical properties.

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[2021YFB3800702] ; State Key Research Development Programme of China[22075124] ; National Natural Science Foundation of China["JCYJ20190809115013348","JCYJ20210324103811030"] ; Shenzhen Special Fund[2020B121201002]

Polymer Science

Polymer Science

WOS:001247412700001

AMER CHEMICAL SOC

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Grubbs Inst, Shenzhen 518005, Peoples R China
2.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518005, Peoples R China
3.Zhejiang Univ, Coll Chem & Biol Engn, State Key Lab Chem Engn, Hangzhou 310058, Peoples R China
4.Zhejiang Univ, Inst Polymerizat & Polymer Engn, Hangzhou 310058, Peoples R China
5.Southern Univ Sci & Technol, Guangdong Prov Key Lab Catalysis, Shenzhen 518005, Peoples R China

Qiu, Nanting,Sun, Zhiqiang,Yu, Feng,et al. Chain Shuttling Polymerization for Cycloolefin Block Copolymers: From Engineering Plastics to Thermoplastic Elastomers[J]. MACROMOLECULES,2024,57(12).

Qiu, Nanting.,Sun, Zhiqiang.,Yu, Feng.,Wang, Keqiang.,Long, Chuanjiang.,...&Chen, Zhong-Ren.(2024).Chain Shuttling Polymerization for Cycloolefin Block Copolymers: From Engineering Plastics to Thermoplastic Elastomers.MACROMOLECULES,57(12).

Qiu, Nanting,et al."Chain Shuttling Polymerization for Cycloolefin Block Copolymers: From Engineering Plastics to Thermoplastic Elastomers".MACROMOLECULES 57.12(2024).