Photodeformable Microspheres from Amphiphilic Azo Polyurethane. Issue 20 (21st September 2015)

• Record Type: Journal Article
• Authors: Zhou, Yuqi; Wang, Xiao Gong
• Is Part Of: Macromolecular chemistry and physics. Volume 216:Issue 20(2015:Oct.)
• Page Start: 2040
• Page End: 2047
• Publication Date: 2015-09-21
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201500228
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Photodeformable microspheres are fabricated from a newly synthesized amphiphilic azo polyurethane (PU) through gradually hydrophobic aggregation. For the synthesis, a PU‐based precursor polymer (PU‐Ph) is synthesized through step polymerization between 4, 4′‐methylenebis(phenyl isocyanate) and <italic>N</italic>‐phenyldiethanolamine. Then, the PU‐based azo polymer (PU‐Azo‐Ph) is obtained by postpolymerization azo‐coupling reaction between PU‐Ph and diazonium salt of 4‐aminobenzoic acid. The microspheres with controllable morphology and narrow size distribution are fabricated by gradually adding H<sub>2</sub>O into tetrahydrofuran solutions of PU‐Azo‐Ph, which are characterized by laser light scattering and transmission electron micro­scopy. The research indicates that the colloid structures can be significantly modified by adjusting the preset water content in the preparation process. By adjusting the self‐assembling condition, the colloidal microspheres with solid interiors and porous and hollow structures are obtained. Upon exposure to a linearly polarized Ar<sup>+</sup> laser beam, the microspheres are elongated along the polarization direction to give ellipsoids and other elongated structures. <graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgkhm0d37c" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></p> </abstract>