Photoinduced Metal-Free Surface Initiated ATRP from Hollow Spheres Surface

Autor: Liping Bai, Guang Li, Qian Liu, Lin Xu, Chun-Na Yan, Liping Wang
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Polymers
Polymers, Vol 11, Iss 4, p 599 (2019)
Volume 11
Issue 4
ISSN: 2073-4360
Popis: Well-defined amphiphilic diblock copolymer poly (methyl methacrylate)-b-poly (N-isopropylacrylamide) grafted hollow spheres (HS-g-PMMA-b-PNIPAM) hybrid materials were synthesized via metal-free surface-initiated atom transfer radical polymerization (SI-ATRP). The ATRP initiators &alpha
Bromoisobutyryl bromide (BIBB) were attached onto hollow sphere surfaces through esterification of acyl bromide groups and hydroxyl groups. The synthetic ATRP initiators (HS-Br) were further used for the metal-free SI-ATRP of methyl methacrylate (MMA) and N-isopropyl acrylamide (NIPAM) using 10-phenylphenothiazine (PTH) as the photocatalyst. The molecular weight of the polymers, structure, morphology, and thermal stability of the hybrid materials were characterized via gel permeation chromatography (GPC), X-ray photoelectron spectroscopy (XPS), 1H-nuclear magnetic resonance spectroscopy (1H NMR), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA), respectively. The results indicated that the ATRP initiator had been immobilized onto HS surfaces successfully followed by metal-free SI-ATRP of MMA and NIPAM, the Br atom had located at the end of the main PMMA polymer chain, and the polymerization process possessed the characteristic of controlled/&ldquo
living&rdquo
polymerization. The thermal stability of the hybrid materials was increased significantly compared to the pure PMMA and PNIPAM.
Databáze: OpenAIRE
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