Brush- First Synthesis of Core- Photodegradable Miktoarm Star Polymers via ROMP: Towards Photoresponsive Self- Assemblies

被引：51
作者：
Burts, Alan O.
Gao, Angela X.
Johnson, Jeremiah A.
机构：
[1] Cambridge, MA 02116
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2014年 / 35卷 / 02期
关键词：
graft-through; macromonomers; miktoarm; star polymers; ROMP; TRANSFER RADICAL POLYMERIZATION; SUCCESSIVE SYNTHESIS; BRANCHED POLYMERS; MULTICOMPARTMENT MICELLES; FACILE SYNTHESIS; TERPOLYMERS; COPOLYMERS; ARMS; ATRP; MACROMONOMERS;
D O I：
10.1002/marc.201300618
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
This report describes the synthesis of miktoarm brush-arm star polymers (BASPs) from branched and linear norbornene-terminated macromonomers (MMs) via the brush-first ring-opening metathesis polymerization (ROMP) method. First, a polystyrene (PS)-branch-poly(lactic acid) (PLA) MM is synthesized via a combination of atom transfer radical polymerization (ATRP), tin(II)-mediated ring opening polymerization, and copper-catalyzed azide-alkyne cycloaddition reactions. Graft-through ROMP of this MM followed by in situ cross-linking with a photo-cleavable bis-norbornene derivative provided nanoscopic BASPs with photodegradable cores and a precise 1:1 PS:PLA arm composition. Three-miktoarm BASPs are prepared in an analogous manner via copolymerization of the same PS-branch-PLA MM with a poly(ethylene glycol) (PEG) MM prior to cross-linking. Intramolecular phase segregation of these miktoarm BASPs is characterized by transmission electron microscopy (TEM); a UV-induced structural rearrangement from three-faced Janus particles to micelles is observed.
引用
收藏
页码：168 / 173
页数：6
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