Cononsolvency Effects on the Structure and Dynamics of Microgels

被引：41

作者：

Maccarrone, Simona ^{[1
]}

Scherzinger, Christine ^{[2
]}

Holderer, Olaf ^{[1
]}

Lindner, Peter ^{[3
]}

Sharp, Melissa ^{[3
]}

Richtering, Walter ^{[2
]}

Richter, Dieter ^{[1
,4
]}

机构：

[1] Forschungszentrum Julich, JCNS, Outstn MLZ, D-85747 Garching, Germany

[2] Rhein Westfal TH Aachen, Inst Phys Chem, D-52056 Aachen, Germany

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[4] Forschungszentrum Julich, Inst Complex Syst, D-52425 Julich, Germany

来源：

MACROMOLECULES | 2014年 / 47卷 / 17期

关键词：

ANGLE NEUTRON-SCATTERING; CORE-SHELL MICROGELS; N-ISOPROPYLACRYLAMIDE; POLY(N-ISOPROPYLACRYLAMIDE); PARTICLES; BEHAVIOR; POLY(N; N-DIETHYLACRYLAMIDE); ARCHITECTURE; SOLVATION; COPOLYMER;

D O I：

10.1021/ma500954t

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Sensitive microgels are submicrometer sized, cross-linked polymer particles with a unique swelling behavior changing in response to surrounding conditions like temperature, pH and ionic strength. In this study we influence the swelling capability of thermosensitive microgels microgel by the composition of the solvent (cononsolvency). In particular, we investigate the effects on the structure and dynamics of poly(N-isopropylacrylamide) (PNIPAM) and poly(N,N-diethylacrylamide) (PDEAAM) microgels with different degree of swelling in MeOD/D2O solvent mixture at 10 degrees C using a combination of small angle neutron scattering (SANS) and neutron spin echo (NSE) spectroscopy at nanoseconds scales in the range of several nanometers. The structural characterization including size and density profiles was determined by fitting SANS data. The dynamical behavior of partially collapsed and swollen microgels is comprehensively described within the theory of semidilute polymers in solutions where hydrodynamic interactions are dominant. The partially collapsed PNIPAM microgel particles are not solid diffusing objects but they have relevant contributions from internal motions. Thus, Zimm segmental dynamics can be detected with elevated apparent viscosity. The swollen PDEAAM microgel particles have a faster internal dynamics compared to the partially collapsed PNIPAM. It can also be explained by Zimm-like relaxations with relatively high apparent viscosity and an additional diffusive contribution coming from the cross-linkers.

引用

页码：5982 / 5988

页数：7

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