Zwitterionic hydrogels crosslinked with novel zwitterionic crosslinkers: Synthesis and characterization
摘要:
Two novel zwitterionic sulfobetaine dimethacrylate crosslinkersN,N-bis(methacryloxyethyl)-N-methyl-N-(3-sulfopropyl)ammonium (CL1) and N,N-bis(methacryloxyethyl)-N-methyl-N-(4-sulfobutyl)ammonium (CL2) betaines were synthesized and used for preparation of zwitterionic hydrogels formed from N-(methacryloxyethyl)-N,N-dimethyl-N-(3-sulfopropyl)ammonium betaine (SBDMA) via redox-initiated free-radical polymerization. The commercially available crosslinkers N,N'-methylene bisacrylamide (BIS) and ethylene glycol dimethacrylate (EDMA) were also used. Equilibrium water content, sorption degree, diffusion coefficient of water, state of water, degree of crosslinking and mechanical properties were determined for hydrogels crosslinked using different crosslinking conditions. A minor difference in the spacer length between the charged moieties in CL1 and CL2 crosslinkers, respectively, was shown to influence the hydrogel properties. The CL1 and CL2 crosslinkers with chemical structure similar to SBDMA resulted in hydrogels with higher stiffness, mechanical strength and crosslink density compared to hydrogels crosslinked by BIS and EDMA. This difference was assigned to suppression of the compositional drift during the hydrogel formation when crosslinkers with chemical structure similar to monomer were used. PolySBDMA hydrogels exhibited a low adhesion of RAT-2 fibroblasts-like cells. (C) 2011 Elsevier Ltd. All rights reserved.
Provided are dental polymerizable monomer compositions that can give cured products having high toughness and high rigidity, and dental compositions containing such dental polymerizable monomer compositions and cured products thereof having high mechanical properties. The dental polymerizable monomer composition includes a urethane acrylate compound (A) and a polymerizable compound (B) having at least one polymerizable group selected from methacryloyl groups and acryloyl groups, the urethane acrylate compound (A) being obtained by reacting a specific hydroxyacrylate (a1) with a diisocyanate (a2) having two isocyanate groups bonded to a divalent C
6-9
aromatic hydrocarbon group or a divalent C
6-9
bridged cyclic hydrocarbon group via a methylene group optionally substituted with a hydrocarbon group in place of a hydrogen atom, the proportion of the number of acryloyl groups present in the urethane acrylate compound (A) being 10% to less than 90% relative to the total number of (meth)acryloyl groups in the monomer composition.
NOVEL COMPOUND, COMPOSITION COMPRISING THE COMPOUND AND CURED PRODUCT
申请人:NARUSE Hiroshi
公开号:US20120296061A1
公开(公告)日:2012-11-22
The present invention provides a novel compound and a composition including the compound that exhibit small polymerization shrinkage particularly during curing and are producible at low cost on the industrial scale. The compound of the present invention is represented by Formula (
1
):
DENTAL MATERIAL, DENTAL MATERIAL COMPOSITION, DENTAL RESTORATIVE MATERIAL, AND CURED PRODUCT
申请人:NARUSE Hiroshi
公开号:US20120296003A1
公开(公告)日:2012-11-22
The present invention provides a dental material, a dental material composition and a dental restorative material that exhibit small polymerization shrinkage particularly during curing and are producible at low cost on the industrial scale. The dental material of the present invention includes a specific urethane (meth)acrylic compound represented by Formula (1) described below.
Cation-Condensed Microgel-Core Star Polymers as Polycationic Nanocapsules for Molecular Capture and Release in Water
作者:Kaoru Fukae、Takaya Terashima、Mitsuo Sawamoto
DOI:10.1021/ma300266k
日期:2012.4.24
ruthenium-catalyzed living radical polymerization. Analyzed by UV–vis spectroscopy, the starpolymer efficiently encapsulated various hydrophilic dyes carrying sulfonate anions (methyl orange: MO; orange G: OG; methyl blue: MB) in water (UV–vis: ∼400 OG per a singlestar). The efficient dye encapsulation is due to the high concentration of quaternary ammonium cations in the core. The number of core-bound dyes