摘要:
In one aspect, the invention relates to relates to copolymer compositions comprising domains of polycarbonate and polyacrylate, and to methods of preparing the copolymers, wherein the method comprises reacting a polycarbonate macroinitator with a vinyl monomer by atom transfer radical polymerization.
摘要:
The invention relates to the use of oligocarbonates with terminal groups containing iodine for the production of moulded parts with high X-ray contrast, high transparency, high thermostability and good mechanical properties, especially for toys and medical parts.
摘要:
Halofluorinated alkylene monomers are made by a method comprising the steps of: (a) subjecting a first polymer which is the reaction product of a fluorinated vinyl monomer and a vinyl comonomer to dehydrohalogenation to form a second polymer; (b) treating the second polymer with an oxidizing agent to form an oxidation product consisting of a alpha , omega -dicarboxylic acid or an ester derivative thereof; and (c) treating said oxidation product with a reducing agent to form a reduction product consisting of a alpha , omega -diol. Preferably, the first polymer has a structure of -[CH2CYZ(CF2CFX)n]m- wherein X and Y = F, C1 or Br; X and Y may be the same or different; Z = H, F, C1, Br, alkyl or perfluoroalkyl containing from about 1 to about 10 carbon atoms; n = an integer larger than about 1; and m is an integer between about 2 and about 10 . The alpha , omega -dicarboxylic acids and alpha , omega -diols produced herein can be directly used as polycondensation monomers. Alternatively, the alpha , omega -dicarboxylic acids and alpha , omega -diols can be further derivitized to tri-, tetra- or other multifunctional alcohols which may be directly used as condensation monomers or they may be converted to acrylates which may be photocured in the presence of a radical photoinitiator into transparent polymers which are useful as optical waveguiding materials.
摘要翻译:通过包括以下步骤的方法制备卤代亚烷基单体:(a)使作为氟化乙烯基单体和乙烯基共聚单体的反应产物的第一聚合物进行脱卤化氢以形成第二聚合物; (b)用氧化剂处理第二聚合物以形成由α,ω-二羧酸或其酯衍生物组成的氧化产物; 和(c)用还原剂处理所述氧化产物以形成由α,ω-二醇组成的还原产物。 优选地,第一聚合物具有 - [CH 2 CYZ(CF 2 CFX)n] m - 其中X和Y = F,Cl或Br的结构; X和Y可以相同或不同; Z = H,F,C1,Br,含有约1至约10个碳原子的烷基或全氟烷基; n =大于1的整数; m为约2至约10 5之间的整数。 本文生产的α,ω-二羧酸和α,ω-二醇可以直接用作缩聚单体。 或者,可以将α,ω-二羧酸和α,ω-二醇进一步衍生为可以直接用作缩合单体的三元,四元或其它多官能醇,或者它们可以转化成丙烯酸酯,其可以在 将自由基光引发剂存在于用作光波导材料的透明聚合物中。
摘要:
The present invention is directed to a compound and a process for preparing a compound having at least one perfluorovinyl group and at least one functional group, the compound suitable for reacting with and/or forming polymers. The compound is preferably represented by the following formula (I): (G)n-R-(X-CF=CF2)m, wherein R represents an optionally substituted hydrocarbyl group, X represents any group which links R and a perfluorovinyl group; n is an integer of at least 1, m is an integer of at least 1; and G represents any reactive functional group or a group convertible into a reactive functional group. The process for preparing the compound of formula (I) comprises the steps of: (a) preparing a 2-halotetrafluoro compound of the following formula (III): (Q-CF2-CF2-X)m-R-(G'')n, wherein R, X, m and n are as defined for formula (I) and Q is bromine, chlorine or iodine; and G'' is a functional group G, or a functional group suitable for conversion into G; (b) chemically modifying group G'' to produce functional group G where G'' is a functional group suitable for a conversion into G; and (c) dehalogenating the 2-halotetrafluoro compound to form the corresponding trifluorovinyl compound.
摘要:
Verfahren zur Herstellung eines dreidimensionalen Objekts durch selektives schichtweises Verfestigen eines pulverförmigen Materials an den dem Querschnitt des Objekts in einer jeweiligen Schicht entsprechenden Stellen mittels Einwirkung von elektromagnetischer Strahlung. Das pulverförmige Material umfasst mindestens ein Polymer, das aus der Schmelze nur in im Wesentlichen oder vollständig amorpher oder vollständig amorpher Form darstellbar ist, oder ein Polyblend, das aus der Schmelze nur in im Wesentlichen oder vollständig amorpher oder vollständig amorpher Form darstellbar ist. Das pulverförmige Material weist eine spezifische Schmelzenthalpie von mindestens 1 J/g auf.
摘要:
A polyester having less than 50 hydrogen-carbon bonds per 1000 molecular weight units exhibits very low optical loss in the range of wavelengths commonly used for optical communication, and exhibits other physical properties suitable for use as a waveguide core material and/or a waveguide cladding material in optical fibers and/or planar optical devices.
摘要:
The invention relates to the use of thermoplastic materials containing iodine and/or bromine for moulded parts with high X-ray contrast. The invention also relates to moulded parts produced therewith, notably toys and medical devices.
摘要:
The invention relates to the use of polycarbonates containing iodine phenyl carbonate for producing special shaped parts, especially for medical applications and toys.
摘要:
Disclosed are monomeric compounds which may be polymerized to form novel biodegradable and bioresorbable polymers and co-polymers. These polymers and co-polymers, while not limited thereto, may be adapted for radioopacity and are useful for medical device applications and controlled release therapeutic formulations.
摘要:
下記一般式(1)で表されるポリカーボネート樹脂を含む塗工液から成形してなる成形体は、透明性に優れ、撥水性、撥油性が良好であり、摩擦係数が低く表面潤滑性に優れ、耐摩耗性の向上し得る成形体となり得る。 [式(1)中、R f は、炭素数が5以上で、且つ、フッ素原子数が11以上であるパーフルオロアルキル基、あるいは特定構造を有するパーフルオロアルキルオキシ基を示す。Wは、特定の構造単位を含有する2価の基を示す。]