183387-28-2Relevant articles and documents
Organic-inorganic polymer hybrids using polyoxazoline initiated by functionalized silsesquioxane
Kim, Kyung-Min,Keum, Dong-Ki,Chujo, Yoshiki
, p. 867 - 875 (2003)
New hybrid polyoxazolines (CubePOZO) were synthesized by ring-opening polymerization of 2-methyl-2-oxazoline initiated by functionalized polyhedral oligomeric silsesquioxane (POSS) with various feed ratios. The hybrid micelles derived from CubePOZO with both seven hydrophobic cyclopentyl groups of POSS and polyoxazoline (POZO) as a hydrophilic segment were prepared in an aqueous phase. Compared to POZO initiated by cyclohexyl iodide or methyl p-toluenesulfonate, increased hydrophobicity caused by the structure of POSS in CubePOZO played a major role in the micelle formation. This depended on the amount of POSS incorporated into the POZO. The CubePOZO100 and CubePOZO200 formed micelles in an aqueous phase with critical micelle concentrations (cmc) of 55 and 100 mg/L, respectively. Transparent polymer hybrids, homogeneous dispersion of hydrophobic POSS bonded covalently to POZO in the silica gel matrix at the molecular level, were obtained through hydrogen-bonding interaction between CubePOZO and silica gel. The obtained polymer hybrids from CubePOZO showed excellent solvent resistance, similar to that of polymer hybrids having an interpenetrating polymer network structure. It was concluded that the solvent-resistant property came from the size of POSS and the hydrophobic interaction between the POSS in the silica gel matrix. In addition, thermal stability of the polymer hybrids from CubePOZO was much increased compared to that of the polymer hybrids from homoPOZO and POSS.
Rational design of polyhedral oligomeric silsesquioxane fillers for simultaneous improvements of thermomechanical properties and lowering refractive indices of polymer films
Jeon, Jong-Hwan,Tanaka, Kazuo,Chujo, Yoshiki
, p. 3583 - 3589 (2013/09/02)
We describe here the design and synthesis of the polyhedral oligomeric silsesquioxane (POSS)-based dual-functional molecular fillers for simultaneously lowering refractive indices and improving thermomechanical properties of conventional polymers. We prep
Ring opening metathesis polymerization of polyoctahedral oligomeric silsesquioxanes (POSS) incorporated oxanorbornene-5,6-dicarboximide: Synthesis, characterization, and surface morphology of copolymers
Gnanasekaran,Madhavan,Tsibouklis, John,Reddy
scheme or table, p. 309 - 315 (2012/01/13)
The synthesis and characterization of N-propyl-POSS-7-oxanorbornene-5,6- dicarboximide (NPONDI) and N-3-(trifluoromethyl)phenyl-7-oxanorbornene-5,6- dicarboximide (TFNDI) was reported. The synthesis of the POSS-based (co)polymers were accomplished by ring opening metathesis polymerization (ROMP). The monomers and polymers were characterized using FT-IR, 1H-, 13C-, 29Si-NMR, and GPC techniques. Thermal properties of TFNDI-NPONDI copolymers were evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Transmission electron microscopic (TEM) analysis of optically transparent and flexible copolymer films revealed the presence of 50nm-sized POSS agglomerates. Atomic force microscopy analysis of the film surface exhibited a modest increase in surface roughness of TFNDI-NPONDI copolymers as compared with homopoly[N-3(trifluoromethyl)phenyl-7- oxanorbornene-5,6-dicarboximide] (HTFNDI). The POSS incorporated polymers such as 1NPONDI, 2NPONDI, and 3NPONDI increased the hydrophobicity as compared with HTFNDI. This was measured by static contact angle analysis. The study focussed on the dispersion, surface morphology, and the microstructure of POSS in TFNDI-NPONDI copolymer as determined by scanning electron microscopy (SEM). CSIRO 2011.
