Controlled Poly(ethylene glycol) Network Structures through Silsesquioxane Cross-Links Formed by Sol−Gel Reactions

2010 ◽  
Vol 43 (23) ◽  
pp. 9957-9963 ◽  
Author(s):  
Babak Radi ◽  
R. Mark Wellard ◽  
Graeme A. George
Keyword(s):  
Ethylene Glycol ◽  
Sol Gel ◽  
Network Structures ◽  
Poly Ethylene Glycol ◽  
Cross Links ◽  
Poly Ethylene

scholarly journals Bioactive organic/inorganic hybrids with improved mechanical performance

2015 ◽  
Vol 3 (7) ◽  
pp. 1379-1390 ◽  
Author(s):  
Ailing Li ◽  
Hong Shen ◽  
Huihui Ren ◽  
Chen Wang ◽  
Decheng Wu ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Mechanical Performance ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Interpenetrating Networks ◽  
Poly Ethylene

New sol–gel functionalized poly-ethylene glycol (PEGM)/SiO2–CaO hybrids were prepared with interpenetrating networks of silica and PEGM through the formation of Si–O–Si bonds.

Controlled Hierarchical Pore Structures in Ethylene-Bridged Polysilsesquioxane Gels

2003 ◽  
Vol 788 ◽  
Author(s):  
Yuki Kobayashi ◽  
Kazuki Nakanishi ◽  
Kazuyuki Hirao
Keyword(s):  
Phase Separation ◽  
Ethylene Glycol ◽  
Triblock Copolymers ◽  
Sol Gel ◽  
Poly Ethylene Glycol ◽  
Bridged Polysilsesquioxane ◽  
Sol Gel Transition ◽  
Poly Ethylene ◽  
Hierarchical Pore ◽  
Gel Transition

ABSTRACTFormation of hierarchical macropores and mesopores in ethylene-bridged polysilsesquioxane sol-gel systems via concurrent sol-gel transition and phase separation induced by the incorporation of supramolecular templats has been investigated. A series of poly(ethylene-glycol)-poly(propyleneglycol)- poly(ethyleneglycol) triblock copolymers, EOPOEOs, have been employed as supramolecular templates, while 1,2-bis(trimethoxysilyl)ethane was used as a polysilsesquioxane source. Successful combination of templated mesopores and well-defined macropores due to phase-separation has been found in the system with EOPOEOs having 70 PO units and respective 20 EO units. Although similar macroporous morphology has been obtained for all the EOPOEOs with EO chain longer or shorter than 20 units, the optimum composition for the co-continuous macropores and that for templated mesopores deviated from each other, resulting in the failure of producing hierarchical macropores and mesopores.

Poly(lactic acid)/poly(ethylene glycol) stereocomplexed physical hydrogels showing thermally-induced gel–sol–gel multiple phase transitions

2018 ◽  
Vol 2 (2) ◽  
pp. 313-322 ◽  
Author(s):  
Hailiang Mao ◽  
Chen Wang ◽  
Xiaohua Chang ◽  
Heqing Cao ◽  
Guorong Shan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Phase Transitions ◽  
Ethylene Glycol ◽  
Sol Gel ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Thermally Induced ◽  
Multiple Phase ◽  
Poly Ethylene

A novel thermogel exhibiting unique thermally-induced gel–sol–gel multiple phase transitions was obtained by controlling the compositions of PLA/PEG copolymers.

Effects of poly(ethylene glycol) additive molecular weight on the microstructure and properties of sol-gel-derived lead zirconate titanate thin films

2003 ◽  
Vol 18 (3) ◽  
pp. 737-741 ◽  
Author(s):  
Shuhui Yu ◽  
Kui Yao ◽  
Santiranjan Shannigrahi ◽  
Francis Tay Eng Hock
Keyword(s):  
Thin Films ◽  
Molecular Weight ◽  
Ethylene Glycol ◽  
Lead Zirconate Titanate ◽  
Sol Gel ◽  
Lead Zirconate ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Zirconate Titanate ◽  
Poly Ethylene

Poly(ethylene glycol) (PEG) additives with different molecular weights were used to modify sol-gel precursor solutions for preparing lead zirconate titanate (PZT) thin films. The morphology, crystalline structure, and mechanical and electrical properties of the films were characterized. The relationship between the characteristics of the films and the molecular weight of PEG was investigated. It was observed that the PEG eliminated cracking of the films during multiple pyrolysis treatments. However, with the increase of the PEG molecular weight, the films became less dense, which led to decreased Young's modulus and dielectric constant and increased coercive field. Our experiments showed that films prepared from sols modified by PEG with a molecular weight of 200 exhibited a dense morphology and excellent mechanical and electric properties without cracking.

SAXS, FESEM AND BET STUDIES OF MESOPOROUS CATALYST SBA-15CONTAINING ZINC PORPHYRIN FOR EPOXIDATION OF LIMONENE

2015 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Nurafiqah Saadon ◽  
Salasiah Endud ◽  
Mohd Bakri Bakar ◽  
Hendrik O. Lintang ◽  
Nurliana Roslan
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Ammonium Acetate ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Poly Ethylene Glycol ◽  
Epoxidation Reaction ◽  
Poly Ethylene ◽  
Poly Propylene

SBA-15 nanoporous silica was prepared by cooperative self-assembly of tetraethylorthosilicate precursor in the presence of poly(ethylene glycol)–block–poly(propylene glycol)–block–poly(ethylene glycol) copolymer surfactant and functionalized with (3-aminopropyl) triethoxysilane (APTES) via sol-gel reaction to obtain NH2-SBA-15. The metalloporphyrin, [meso-tetrakis-(p-chlorophenyl)porphyrinato]Zn(II) (ZnTClPP) was synthesized from the reaction of meso-tetrakis-(p-chlorophenyl) porphyrin (H2TClPP) using zinc acetate dihydrate as a metal source and then immobilized on SBA-15 surface. The material, NH2-SBA-15-ZnP was characterized by SAXS, FESEM and BET studies and showed a similar pattern as SBA-15 indicating that the mesoporous hexagonal structure of SBA-15 was still retained. Then, the material was applied to catalyze the epoxidation of limonene, using H2O2 / ammonium acetate at various temperatures and conditions. All the products formed from the epoxidation reaction were analyzed using GC-FID and GC-MS.  

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