Temperature and pH dual-responsive behavior of polyhedral oligomeric silsesquioxane-based star-block copolymer with poly(acrylic acid-block-N-isopropylacrylamide) as arms

被引：16

作者：

Bai, Yu ^{[1
]}

Wei, Jia ^{[1
]}

Yang, Liping ^{[1
]}

He, Chaobin ^{[2
]}

Lu, Xuehong ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[2] Inst Mat Res & Engn, Singapore 117602, Singapore

来源：

COLLOID AND POLYMER SCIENCE | 2012年 / 290卷 / 06期

关键词：

Poly(N-isopropylacrylamide) (PNIPAm); Polyhedral oligomeric silsesquioxane (POSS); Temperature responsive; pH responsive; Critical temperature (T-c); TRANSFER RADICAL POLYMERIZATION; POLY N-ISOPROPYLACRYLAMIDE; RAFT POLYMERIZATION; MOLECULAR-WEIGHT; PHASE-TRANSITION; THERMAL RESPONSE; AQUEOUS-SOLUTION; POLY(N-ISOPROPYLACRYLAMIDE); HYDROGELS; ACID);

D O I：

10.1007/s00396-011-2562-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Poly(acrylic acid-block-N-isopropylacrylamide) (PAAc-b-PNIPAm)-tethered octafunctional polyhedral oligomeric silsesquioxane (POSS) were synthesized via POSS-initialized atom transfer radical polymerization. When very short PAAc blocks are placed between the POSS core and PNIPAm short chains, the critical temperature (T-c) of POSS-PAAc-b-PNIPAm determined by cloud point measurements varies in a wide temperature range with pH, and its T-c is even lower than that of POSS-PNIPAm with similar chain length at pH=5.0, indicating a synergic effect between high local chain density and intramolecular interaction between PAAc and PNIPAm. When the PAAc blocks are relatively long, the pH response of POSS-PAAc-b-PNIPAm diminishes owing to the reduced local PNIPAm chain density.

引用

页码：507 / 515

页数：9

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