Poly(N-isopropylacrylamide) Microgels under Alcoholic Intoxication: When a LCST Polymer Shows Swelling with Increasing Temperature

被引：52

作者：

Backes, Sebastian ^{[1
,2
]}

Krause, Patrick ^{[1
]}

Tabaka, Weronika ^{[1
]}

Witt, Marcus U. ^{[1
,2
]}

Mukherji, Debashish ^{[3
]}

Kremer, Kurt ^{[3
]}

von Klitzing, Regine ^{[1
,2
]}

机构：

[1] Tech Univ Berlin, Stranski Lab Phys & Theoret Chem, Str 17 Juni 124, D-10623 Berlin, Germany

[2] Tech Univ Darmstadt, Inst Phys, Alarich Weiss Str 10, D-64287 Darmstadt, Germany

[3] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany

来源：

ACS MACRO LETTERS | 2017年 / 6卷 / 10期

关键词：

TO-COIL TRANSITION; N-ISOPROPYLACRYLAMIDE; THERMORESPONSIVE POLYMERS; PHASE-BEHAVIOR; PNIPAM; CONONSOLVENCY; HYDROGELS; DYNAMICS; CONFORMATION; NONSOLVENCY;

D O I：

10.1021/acsmacrolett.7b00557

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(N-isopropylacrylamide) (PNIPAM) microgel is a smart polymer that shows a volume phase transition temperature (VPTT) at around 32 degrees C in aqueous solutions, above which it collapses. In this work, combining experiments and molecular simulations, it is shown that PNIPAM microgels do not always exhibit a collapsed structure above the VPTT. Instead, PNIPAM in aqueous alcohol mixtures shows a two-step conformational transition, i.e., a collapse at low temperatures (T < 32 degrees C) and a reswelling when T > 50 degrees C. The present analysis indicates that delicate microscopic interaction details, together with the bulk solution properties, play a key role in dictating the reswelling behavior. Even when PNIPAM microgels swell with increasing T, this is not a standard upper critical solution behavior.

引用

页码：1042 / 1046

页数：5

共 47 条

[11]

de Gennes P, 1979, Scaling concepts in polymer physics

[12] Communication: Cosolvency and cononsolvency explained in terms of a Flory-Huggins type theory [J].

Dudowicz, Jacek ;

Freed, Karl F. ;

Douglas, Jack F. .

JOURNAL OF CHEMICAL PHYSICS, 2015, 143 (13)

[13] Origin of cononsolvency, based on the structure of tetrahydrofuran-water mixture [J].

Hao, Jinkun ;

Cheng, He ;

Butler, Paul ;

Zhang, Li ;

Han, Charles C. .

JOURNAL OF CHEMICAL PHYSICS, 2010, 132 (15)

[14] Separation of Storage and Loss Modulus of Polyelectrolyte Multilayers on a Nanoscale: A Dynamic AFM Study [J].

Hellwig, Johannes ;

Micciulla, Samantha ;

Strebe, Julia ;

von Klitzing, Regine .

LANGMUIR, 2016, 32 (41) :10505-10512

[15] Rationalizing Polymer Swelling and Collapse under Attractive Cosolvent Conditions [J].

Heyda, Jan ;

Muzdalo, Anja ;

Dzubiella, Joachim .

MACROMOLECULES, 2013, 46 (03) :1231-1238

[16] CRITICAL-POINTS OF THE VOLUME PHASE-TRANSITION IN N-ISOPROPYLACRYLAMIDE GELS [J].

HIROTSU, S .

JOURNAL OF CHEMICAL PHYSICS, 1988, 88 (01) :427-431

[17] Hydrogels for biomedical applications [J].

Hoffman, Allan S. .

ADVANCED DRUG DELIVERY REVIEWS, 2012, 64 :18-23

[18]

Kim J., 2005, Angew. Chem. Int. Ed, V117, P1357

[19] Temperature dependent phase behavior of PNIPAM microgels in mixed water/methanol solvents [J].

Kojima, Hiroyuki ;

Tanaka, Fumihiko ;

Scherzinger, Christine ;

Richtering, Walter .

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 2013, 51 (14) :1100-1111

[20] Reentrant volume phase transition of cross-linked poly(N-isopropylacrylamide) gels in mixed solvents of water/methanol [J].

Kojima, Hiroyuki ;

Tanaka, Fumihiko .

SOFT MATTER, 2012, 8 (10) :3010-3020

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