合成了含有五配位硅原子的新型稳定有机硅化合物,命名为(三氟甲硅烷基)2-甲基丙烯酸甲酯,并对其进行了完整的表征,包括单晶 X 射线衍射。标题化合物的不对称单元包含两个独立的分子,其中一个采用 s- cis构型,另一个在 C O 和 C C 键方面具有 s-trans 构型。在晶体中,由于四链键相互作用和氢键 C,构象异构体形成顺式和反式二聚体对H... F. 这些二聚体的能量和几何特征是通过 DFT 方法在 M06-2X/6-311G(d,p) 理论水平使用 QTAIM 分析计算的。使用 Onsager 自洽反应场法在极性介质 (DMSO) 中计算晶体堆积的两个二聚体片段。
Synthesis and Kinetic Studies on the Photochemical Behavior of Polymeric Mesoions from Novel Methacrylic Monomers and of Mesoionic Copolymers with Liquid Crystalline Properties
作者:Alexander Theis、Helmut Ritter
DOI:10.1021/ma034700a
日期:2003.10.1
lengths was developed. Copolymers with methyl methacrylate and cholesteric monomers were prepared; the latter showed liquid crystalline properties. The rate constant of the photocyclization to the bis(β-lactame) structure of various spin-coated polymeric films was determined by irradiation with a HeCd laser (442 nm), whereby two different parameters controlling the rate constant could be found. It was shown
Contrast agents comprising gas-containing or gas-generating polymer
申请人:Nycomed Imaging AS
公开号:US05674468A1
公开(公告)日:1997-10-07
Contrast agents comprising gas-containing or gas-generating polymer microparticles and/or microballoons, in which the polymer is a biodegradable polymer containing units of formula --(O).sub.m --CO--O--C(R.sup.1 R.sup.2)--O--CO--(O).sub.n -- (wherein R.sup.1 and R.sup.2 each represent hydrogen or a carbon-attached monovalent organic group or together form a carbon-attached divalent organic group, and m and n are each independently zero or one) may be used in diagnostic applications such as ultrasound and MR imaging.
METHOD FOR MANUFACTRURING BETA-(METH)ACRYLOYLOXY-GAMMA-BUTYROLACTONES
申请人:JNC CORPORATION
公开号:US20150126753A1
公开(公告)日:2015-05-07
The art relates to provision of a method for manufacturing an (meth)acrylic polymerizable monomer that can be used in various applications, such as an optical material, a resist material, a coating material and a laminate material, and provision of a new β-(meth)acryloyloxy-γ-butyrolactone compound by applying the manufacturing method. The method for manufacturing the β-(meth)acryloyloxy-γ-butyrolactone compound is described, in which a (meth)acrylate compound having a carbonyl group and a ketene compound are condensed and isomerized. Further, the manufacturing method is applied to the new β-(meth)acryloyloxy-γ-butyrolactone compound.
(Meth)acrylate phosphonic esters as adhesion promoters
申请人:Craciun Liliana
公开号:US08372516B2
公开(公告)日:2013-02-12
The invention is directed to compositions on a surface which comprise a) at least a (meth)acrylate prepolymer,
b) an adhesion promoting monomer of formula (I)
wherein Q, R1, R2, R4, R5, m and n are defined herein. Further the compositions may be used to improve the adhesion to surfaces, especially metallic surfaces and may include additional optional components such as adhesion promoting photoinitiators.
Method for making mixed high purity (meth)acrylic anhydrides
申请人:Atofina
公开号:US06346650B1
公开(公告)日:2002-02-12
The invention concerns a method consisting in making a mixed (meth)acrylic anhydride of formula (I) by reacting an alkaline (meth)acrylate of formula (II) and a chloroformate of formula (III), carrying out said reaction in an aqueous medium and in the absence of amines, the mol ratio chloroformate (III)/alkaline (meth)acrylate (II) being at least equal to 1.15. R1 represents H or CH3; R2 represents an alkyl, alkenyl, aryl, alkaryl or aralkyl residue; and M is an alkaline metal.