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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

CO(2)-responsive polyacrylamide microspheres with interpenetrating networks.

Meng Mu¹, Hongyao Yin², Yujun Feng²

¹Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.

Journal of Colloid and Interface Science

|March 13, 2017

Summary

This summary is machine-generated.

Interpenetrating network (IPN) microspheres overcome agglomeration issues, offering enhanced CO2-responsiveness. These intelligent particles demonstrate reversible volume changes, enabling advanced applications.

Keywords:

CO(2)-responsiveness Interpenetrating network Inverse-suspension polymerization Microspheres Polyacrylamide

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

CO2-responsive microspheres are promising for various applications.
Particle agglomeration limits the utility of traditional co-polymerized microspheres.
Interpenetrating network (IPN) structures offer a potential solution to enhance microsphere stability and responsiveness.

Purpose of the Study:

To fabricate and characterize CO2-responsive polyacrylamide (PAM)/poly(dimethyl aminopropyl methacrylamide) (PDMAPMA) IPN microspheres.
To investigate the effect of DMAPMA loading and crosslinking degree on IPN microsphere structure and CO2-responsiveness.
To demonstrate the superiority of IPN structures over co-polymerization for preventing particle agglomeration.

Main Methods:

Fabrication of PAM/PDMAPMA IPN microspheres via inverse seed suspension polymerization.
Characterization using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), optical microscopy (OM), and laser particle size analysis (LS).
Evaluation of CO2-responsiveness through alternating treatment with CO2 and N2 gases.

Main Results:

SEM confirmed homogeneous, compact IPN structures without phase separation.
Particle morphology transitioned from IPN to IPN-membrane with increasing DMAPMA concentration.
Microspheres exhibited reversible volume expansion and collapse upon CO2/N2 treatment.
Non-agglomerated particles were prepared by adjusting seed crosslinking degree.
Maximum relative swelling volume (RSV) reached 11.6 at 87% PDMAPMA loading.

Conclusions:

IPN protocol effectively prevents agglomeration in CO2-responsive microspheres.
The fabricated PAM/PDMAPMA IPN microspheres exhibit tunable CO2-responsiveness.
These non-agglomerated, intelligent microspheres show significant potential for advanced applications requiring controlled volume changes.