Star-shaped nylons, methods for their preparation, tetrasubstituted
carboxylic acids and methods for their preparation
    5.
    发明授权
    Star-shaped nylons, methods for their preparation, tetrasubstituted carboxylic acids and methods for their preparation 失效
    星形尼龙,其制备方法,四取代羧酸及其制备方法

    公开(公告)号:US5346984A

    公开(公告)日:1994-09-13

    申请号:US46837

    申请日:1993-04-14

    摘要: Star-shaped nylons with low melt viscosities and excellent mechanical properties, methods for their preparation, a novel tetrasubstituted carboxylic acid for use as a polymerization core therefor and methods for its preparation are provided.A star-shaped nylon has polymer chains emanating from 3 or more polymerization initiation groups which are substituents bonded to every other or more separated carbon atoms on an aromatic ring of an aromatic compound. The star-shaped nylon is produced by homogeneously mixing the aromatic compound with molten nylon monomer and polymerizing the nylon monomer with the respective polymerization initiation groups as the starting points. A novel tetrasubstituted carboxylic acid having a structure of 3,5,3',5'-biphenyltetracarboxylic acid is useful as a polymerization core for star-shaped nylons.

    摘要翻译: 提供具有低熔体粘度和优异机械性能的星形尼龙,其制备方法,用作其聚合核心的新型四取代羧酸及其制备方法。 星形尼龙具有从3个或更多个聚合引发基团发出的聚合物链,其是与芳族化合物的芳香环上的每隔一个或更多分离的碳原子键合的取代基。 星形尼龙通过将芳族化合物与熔融尼龙单体均匀混合并将尼龙单体与各自的聚合引发基团聚合起始点而制备。 具有3,5,3',5'-联苯四羧酸结构的新型四取代羧酸可用作星形尼龙的聚合核。

    Method for detecting stresses
    9.
    发明授权
    Method for detecting stresses 失效
    检测应力的方法

    公开(公告)号:US5490426A

    公开(公告)日:1996-02-13

    申请号:US405960

    申请日:1995-03-17

    CPC分类号: G01L1/24 G01L5/0047

    摘要: A method for detecting stresses includes the steps of dispersing a fluorescent substance in a solid portion where stresses are to be detected, measuring fluorescence decay time of the fluorescent substance dispersed in the solid portion, and detecting stresses in the solid portion based on the measured fluorescence decay time. The method enables to non-destructively detect stresses in resin-molded products without impairing their mechanical properties.

    摘要翻译: 用于检测应力的方法包括将荧光物质分散在要检测应力的固体部分中,测量分散在固体部分中的荧光物质的荧光衰减时间,以及基于测量的荧光检测固体部分的应力的步骤 衰减时间 该方法能够在不损害其机械性能的前提下无损地检测树脂成形品中的应力。

    Variable-modulus material
    10.
    发明授权
    Variable-modulus material 失效
    可变模量材料

    公开(公告)号:US5486560A

    公开(公告)日:1996-01-23

    申请号:US320524

    申请日:1994-10-11

    CPC分类号: C08K3/02 C08K3/24 H01B1/127

    摘要: A variable-modulus material is composed of a polymer whose constituent unit is a thiophene or pyrrole molecule having from one to three C.sub.4-12 alkyl side chains, or a copolymer whose constituent unit is the thiophene or pyrrole molecule and which includes in a main chain thereof a conjugated compound with a K-electron bond directly bonded to the above molecule, and at least one additive (in an amount of 0.5-20 wt % of said polymer) selected from halogens, protonic acids, and transition metal halides. It greatly decreases in modulus upon application of an electric field as low as 5-150 V/mm and restores its original modulus upon removal of the electric field. It is suitable for use as vibration dampers and shock absorbers.

    摘要翻译: 可变模量材料由构成单元为具有1至3个C 4-12烷基侧链的噻吩或吡咯分子的聚合物或其构成单元为噻吩或吡咯分子且包含在主链中的共聚物组成 其具有直接键合到上述分子上的K电子键的共轭化合物和选自卤素,质子酸和过渡金属卤化物的至少一种添加剂(所述聚合物的0.5-20重量%的量)。 在施加低至5-150V / mm的电场时,其模量大大降低,并且在去除电场时恢复其原始模量。 适用于减振器和减震器。