Organic–Inorganic Hybrid Nanoparticles with a Complex Hollow Structure

Abstract

Secret chambers: Organic–inorganic hybrid nanoparticles (see picture) with a complex hollow structure were prepared by the self‐assembly of a reactive block copolymer, poly(ethylene oxide)‐block‐poly[3‐(trimethoxysilyl)propyl methacrylate], in DMF/water. Within these hybrid large‐compound vesicles, several cavities are separated by crosslinked hybrid bilayers of uniform thickness.

Preparation and characterization of organic-inorganic hybrid nanomaterials using polyurethane-b-poly[3-(trimethoxysilyl) propyl methacrylate] via RAFT polymerization

“…The peak was also shifted gradually to higher molecular weight and the PDI became narrower with the increase of the feed ratio of TPM ( Table 1), indicating that the RAFT polymerization occurred and the well controlled copolymers were obtained. Polyurethane prepared by condensation polymerization, as 20 Guo et al -eXPRESS Polymer Letters Vol.4, No.1 (2010) [17][18][19][20][21][22][23][24][25] Figure 2. Gel permeation chromatograms of PU and PU-PTPM copolymer precursors known, has a high PDI.…”

“…">Experimental 2.1. MaterialsDibutyl tin dilaurate, 2-hydroxypropyl acrylate (HPA), methyl ethyl ketone (MEK), THF (purchased from Sinopharm Chemical Reagent Co., Ltd China), isophorone diisocyanate (IPDI, from Alfa 18 Guo et al -eXPRESS Polymer Letters Vol.4, No.1 (2010) [17][18][19][20][21][22][23][24][25] Aesar) and isophorone diamine (Fluka), 3-(trimethoxysilyl) propyl methacrylate (TPM, purchased from Acros Organics), 2,2′-Azobisisobutyronitrile (AIBN, purchased from Shanghai Shisihewei Chemical Co.) were used without further purification. Poly(diethylene adipate) (PDA, purchased from Jiangdu Longchuan Wear-Resistant Polymer Materials Co., Ltd China) was dried under vacuum at 80°C for 1 h before use.…”

“…Recently, some research interests have sparked in the studies of self-assembly of copolymers based on poly [3-(trimethoxysilyl) propyl methacrylate] (PTPM). For example, Chen et al reported the preparation and self-assembly behavior of novel organic-inorganic hybrid nanoparticles with a complex hollow structure based on a reactive amphiphilic diblock copolymer, poly(ethylene oxide)-b-poly [3-(trimethoxysilyl) propyl methacrylate] (PEO-b-PTPM) [22]. Polyurethanes (PU), as organic matrices, have received most attention for their versatile properties and a variety of starting materials.…”

“…It may be ascribed to the deformation mechanism of PU [36]. In case of PU composed of hard and soft segment domains, the hard segment domain, sensitive to applied stress, can be tilted 22 Guo et al -eXPRESS Polymer Letters Vol.4, No.1 (2010) [17][18][19][20][21][22][23][24][25] Figure 5. TGA curves of PU and its nanocomposites Figure 6.…”

Siliceous Unilamellar Vesicles and Foams by Using Block‐Copolymer Cooperative Vesicle Templating

“…[12] Moreover, the transformation from siliceous unilamellar vesicles to nanofoams induced by high ionic strength is similar to the formation of large compound vesicles (LCVs) in the presence of a high concentration of ions. [27,28] In our experiments, it has been noticed that the solidification time for vesicles (pH 5, C t = 0.05 M, T = 40°C) and nanofoams (pH 5, C t = 0.20 M, T = 40°C) is 25 and 10 min, respectively. The silicate species are more condensed for vesicles and the vesicular morphology may be "frozen" after precipitation.…”