Hydrophobic TiO2–SiO2 composite aerogels synthesized via in situ epoxy-ring opening polymerization and sol-gel process for enhanced degradation activity

Epoxy resin/polymethyl methacrylate(EP/PMMA,70/30) interpenetrating network composites containing various contents of dimethyl sulfoxide modified kaoline (EP/PMMA /K-DMSO) composites were prepared by a sequential polymeric technique and an in situ intercalation method. FTIR results showed that the epoxy ring opening reaction occurs, the formation of IPN structure of PMMA and EP has been created. The structure of composite material was characterized by scanning electronic microscopy (SEM). The result indicated that higher impact strength and lower tensile strength with increasing concentration of K-DMSO.

Download Full-text

Functionalized graphene oxide in situ initiated ring-opening polymerization for highly sensitive sensing of cytokeratin-19 fragment

Microchimica Acta ◽

10.1007/s00604-021-04780-7 ◽

2021 ◽

Vol 188 (4) ◽

Author(s):

Yanju Liu ◽

Lulu Hao ◽

Wenbin Wang ◽

Huaixia Yang ◽

Fuchun Si ◽

...

Keyword(s):

Graphene Oxide ◽

Ring Opening ◽

Ring Opening Polymerization ◽

Cytokeratin 19 ◽

Functionalized Graphene ◽

Functionalized Graphene Oxide ◽

Highly Sensitive ◽

Cytokeratin 19 Fragment

Download Full-text

Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

MRS Proceedings ◽

10.1557/proc-519-103 ◽

1998 ◽

Vol 519 ◽

Author(s):

Y. Yan ◽

Z. Duan ◽

D.-G. Chen ◽

S. Ray Chaudhuri

Keyword(s):

Sol Gel ◽

Hybrid Coating ◽

Hypsochromic Shift ◽

Hybrid Films ◽

Coating Films ◽

Organic Pigment ◽

Inorganic Hybrid ◽

Matrix Interactions ◽

Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

Download Full-text

TiCp2Cl-Catalyzed Living Radical and Ring Opening Polymerizations Initiated from Epoxides and Aldehydes in the Synthesis of Linear, Graft and Branched Polymers

MRS Proceedings ◽

10.1557/proc-856-bb11.9 ◽

2004 ◽

Vol 856 ◽

Cited By ~ 3

Author(s):

Alexandru D. Asandei ◽

Isaac W. Moran ◽

Gobinda Saha ◽

Yanhui Chen

Keyword(s):

Electron Transfer ◽

Ring Opening ◽

Glycidyl Methacrylate ◽

Ring Opening Polymerization ◽

Branched Polymers ◽

Single Electron Transfer ◽

Radical Ring ◽

Polymer Architectures ◽

Complex Polymer

ABSTRACTTi(III)Cp2Cl-catalyzed radical ring opening (RRO) of epoxides or single electron transfer (SET) reduction of aldehydes generates Ti alkoxides and carbon centered radicals which add to styrene, initiating a radical polymerization. This polymerization is mediate in a living fashion by the reversible termination of growing chains with the TiCp2Cl metalloradical. In addition, polymers or monomers containing pendant epoxide groups (glycidyl methacrylate) can be used as substrates for radical grafting or branching reactions by self condensing vinyl polymerization. In addition, Ti alkoxides generated in situ by both epoxide RRO and aldehyde SET initiate the living ring opening polymerization of ε-caprolactone. Thus, new initiators and catalysts are introduced for the synthesis of complex polymer architectures.

Download Full-text