Synthesis of High Molecular Weight Polymers by Organocatalyzed Living Radical Polymerization and Self-Assembly Behavior

被引:0
作者
Hu, Keling [1 ]
Liu, Shun [1 ]
Zhao, Zhuo [1 ]
Zhang, Yongjun [1 ]
机构
[1] Tiangong Univ, Sch Chem, State Key Lab Separat Membranes & Membrane Proc, Tianjin 300387, Peoples R China
关键词
block copolymers; high molecular weight polymers; living radical polymerization; organocatalysis; self-assembly; BLOCK-COPOLYMERS; MULTIBLOCK COPOLYMERS; DIBLOCK COPOLYMERS; GEL POLYMERIZATION; ELECTRON-TRANSFER; RAFT; METHACRYLATE); GENERATION; ACRYLATES; ACCESS;
D O I
10.1002/marc.202300005
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A mild organocatalyzed living radical polymerization method is studied for high molecular weight polymers (HMWPs), yielding low-dispersity linear and star polymers (D = M-w/M-n = 1.03-1.28) up to M-n = 3.9 x 10(5) and monomer conversion = 80%, where M-n and M-w are the number- and weight-average molecular weights, respectively. Even at high degrees of polymerization (DPs > 2000), this technique still features excellent control over molecular weights and D values, indicating the living character. The macroinitiators prepared at DP = 2000 are subsequently used for block polymerizations at high DPs (>2000) with functional methacrylates, yielding linear A-B diblock, linear B-A-B triblock, and 3-arm star A-B diblock copolymers, suggesting the excellent block efficiency of macroinitiators synthesized at a high DP value (=2000). This mild organocatalyzed living radical polymerization technique can enhance the livingness of propagation radicals and kinetic chain length at high monomer conversions for monomers with moderate propagation rate coefficients (k(p)s), reduce the persistent radical effect as much as possible, and hence enable HMWPs without the presence of metal catalyst, exogenous initiator, or harsh equipment. The obtained amphiphilic block copolymers present unique microphase separation behavior, and hold great potential in advanced materials applications, for example, thermosensitive nanocarriers.
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页数:12
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