3524-68-3Relevant academic research and scientific papers
Piezoelectric pH sensors. AT-cut quartz resonators with amphoteric polymer films
Wang,Ward,Ebersole,Foss
, p. 2553 - 2562 (1993)
Piezoelectric AT-cut quartz resonators immersed in aqueous media, coated with cross-linked films of the random copolymer-{[CH2CH(CO2H)]a-[CH2C(CH3) (CO2CH3)]b-[CH2C(CH3) (CO2CH2CH3-NMe2)]c}n (1), exhibit large frequency changes when the pH is changed in the vicinity of the isoelectric point of the polymer film. The frequency changes are attributed to changes in the viscoelastic properties of the films that occur during phase transitions between the isoelectric form and the cationic polymer (1-NMe2H+) present at low pH or the anionic polymer (1-CO2-) present at high pH. These phase transitions are accompanied by dramatic changes in acoustic energy attenuation, film thickness changes, and film surface energy, as indicated by acoustic impedance analysis, phase measurement interferometric microscopy, and contact angle measurements. The results are consistent with pH-dependent segregation of the isolectric and ionic phases within the bulk and between the bulk and the surface. The unique pH-sensing capabilities of the coated resonators, combined with their robustness, ease of fabrication, and low cost, provide a convenient approach for the measurement of 'threshold' pH changes. Real-time measurements of enzymatic activity and microbe metabolism are demonstrated as examples of potential applications of these sensors.
Preparation method of pentaerythritol triacrylate
-
Paragraph 0029-0032; 0039-0042; 0046; 0049-0052; 0054, (2018/10/19)
The invention discloses a preparation method of pentaerythritol triacrylate. The method comprises the following steps: adding acrylic acid and pentaerythritol into an esterification reactor, adding anion exchange resin acid catalyst, an ion exchange resin supported polymerization inhibitor and a dehydrating agent, performing a reaction under a certain temperature condition, filtering out the superfluous ion exchange resin acid catalyst and the superfluous supported polymerization inhibitor, and performing reduced pressure distillation to remove the superfluous dehydrating agent and acrylic acid and a small amount of water to obtain the pentaerythritol triacrylate product. Compared with the prior art, the method has the advantages of omission of a acid-base neutralization water washing step, great reduction of industrial wastewater discharge, high recovering and recycling rate of the solid catalyst and the polymerization inhibitor, reduction of environmental pollution, and improvementof the yield and the product quality.
METHOD FOR PRODUCING (METH)ACRYLATE
-
Paragraph 0097-0109, (2018/04/26)
A method for producing a (meth) acrylate comprises transesterification reaction of an alcohol and a monofunctional (meth) acrylate with catalysts in combination being cyclic tertiary amines having an azabicyclo structure and compounds containing zinc, separating a solid that contains the catalysts from a reaction product containing a (meth) acrylate, and producing a (meth) acrylate by transesterification reaction of an alcohol and a monofunctional (meth) acrylate, while using the recovered solid catalyst.
(METH)ACRYLATE MANUFACTURING METHOD
-
Paragraph 0103-0104, (2018/05/17)
The present invention provides a (meth)acrylate manufacturing method characterized in that when manufacturing a (meth) acrylate by an ester exchange reaction between an alcohol and a monofunctional (meth)acrylate using catalyst A and catalyst B together, contact treatment of the ester exchange reaction product with adsorbent C is performed. Catalyst A: One or more kinds of compounds selected from a group consisting of cyclic tertiary amines with an azabicyclo structure and salts or complexes thereof, amidine and salts or complexes thereof, compounds with a pyridine ring and salts or complexes thereof, phosphines and salts or complexes thereof, and compounds with a tertiary diamine structure and salts or complexes thereof. Catalyst B: One or more kinds of compounds selected from a group consisting of compounds comprising zinc. Adsorbent C: One or more kinds of compounds selected from a group consisting of oxides and hydroxides comprising at least one of magnesium, aluminum and silicon.
MULTIFUNCTIONAL (METH)ACRYLATE MANUFACTURING METHOD
-
Paragraph 0087; 0088, (2017/08/07)
[Problem] The purpose of the present invention is to obtain a multifunctional (meth)acrylate with good yield by an ester exchange reaction of a polyhydric alcohol such as pentaerythritol or dipentaerythritol with a monofunctional (meth)acrylate. [Solution] A multifunctional (meth)acrylate manufacturing method characterized in that when manufacturing a multifunctional (meth)acrylate by an ester exchange reaction of a polyhydric alcohol with a monofunctional (meth)acrylate, catalyst (A) and catalyst (B) are used together. Catalyst (A): One or more kinds of compounds selected from a group consisting of cyclic tertiary amines with an azabicyclo structure or salts or complexes thereof, amidines or salts or complexes thereof, and compounds with a pyridine ring or salts or complexes thereof. Catalyst (B): One or more kinds of compounds selected from a group consisting of zinc-containing compounds.
COMPOSITION FOR POLYELECTROLYTES, POLYELECTROLYTES, ELECTRICAL DOUBLE LAYER CAPACITORS AND NONAQUEOUS ELECTROLYTE SECONDARY CELLS
-
, (2008/06/13)
A polymer electrolyte-forming composition containing (A) a quaternary ammonium salt of general formula (1) below and (B) an ionic liquid can be converted into a polymer without compromising the excellent properties of the ionic liquid, thus enabling an electrolyte having an excellent safety and electrical conductivity and also a broad potential window to be obtained. In formula (1), R1 to R3 are each independently an alkyl group of 1 to 5 carbons or a substituent having a reactive unsaturated bond and any two from among R1 to R3 may together form a ring, and R4 is methyl, ethyl or a substituent having a reactive unsaturated bond, with the proviso that at least one of R1 to R4 is a substituent having a reactive unsaturated bond. X is a monovalent anion, the letter m is an integer from 1 to 8, and the letter n is an integer from 1 to 4.
Composite materials and adhesion promoters for dental applications
-
, (2008/06/13)
Composite materials particularly suitable in the dental art as a tooth filling material including a polymer matrix, a metal, metal alloy, metal oxide particulate, or combinations thereof, in the presence or absence of colloidal silica, and a coupling agent to adhere the particulate to the polymer matrix. Adhesion can also be facilitated by cleaning and/or coating the particulates prior to incorporation into the polymer matrix. One or two paste systems of the composition with suitable initiators, accelerators, etc. can be formulated.
Liquid oligomers containing acrylate unsaturation
-
, (2008/06/13)
The liquid oligomeric compositions of this invention are made by the Michael addition reaction of acetoacetate functional donor compounds with multifunctional acrylate receptor compounds where the equivalent ratios of multifunctional acrylate to acetoacetate vary from >/=1:1 to >/=13.2:1 depending on the functionality of both multifunctional acrylate and acetoacetate. Unuseable gelled or solid oligomer products occur below the claimed ranges. The liquid oligomers of this invention are further crosslinked to make coatings, laminates and adhesives.
