摘要:
A system for determining photo-chemical reaction heat evolved from a sample material irradiated with radiant energy comprises a calorimeter having a pair of sample holders connected to heat-leakage type thermo-electric elements which develop electric output signals proportionate to the amount of heat energy conducted therethrough. Both sample holders are initially irradiated with radiant energy before disposing the sample material thereon to heat the sample holders and thereby develop electric output reference signals. The amount of radiant energy being irradiated on at least one of the sample holders is then selectively adjusted to effectively compensate for any difference between the two reference signals. Then the sample material is mounted on at least one of the sample holders and both sample holders are irradiated with the adjusted radiant energy thereby enabling determination of the exothermic or endothermic heat value generated by the sample material due to the photo-chemical reaction heat evolved therefrom in accordance with the difference in the electric output signals developed by said thermo-electric elements.
摘要:
There is provided a differential scanning calorimeter for exactly measuring a calorie variation of the measured sample on the basis of the temperature difference between sample container and the reference container without the influence of the heat irregularity incoming from the surroundings and the noise components. The differential scanning calorimeter includes a heating furnace of an approximately H-shaped section having an approximately drum-shaped wall part and an approximately plate-shaped heat inflow part, a heater disposed outside the wall part so as to heat the heating furnace, a approximately bar-shaped heat-resistance member that is arranged along the center axis L of the wall part, that protrudes from both sides of the heat inflow part by an approximately equal length, that is made of a material heat conductivity lower than that of the material of the heating furnace, a sample container disposed at one end of the heat-resistance member, a reference container disposed at the other end of the heat-resistance member, and a differential heat flow detector measuring a difference between the temperature of the sample container and the temperature of the reference container as a measured value.
摘要:
A method of preparing a precursor for a composite having wet strength of 2 to 50 kgf/mm2 and a mean surface void diameter of 0.01 to 2 μm by molding a solution of a rigid polymer having a concentration of 1 to 1.3 times the optical anisotropy lower limit solution concentration C2, thereafter rendering the solution non-flowable by absorbing a coagulant under a condition causing no solvent extraction and thereafter extracting the solvent, and a method of preparing a molecular composite having a mean thickness of 2 to 200 μm by impregnating this precursor for a composite with a solution of a polymer or reactive molecules.
摘要翻译:一种制备湿强度为2〜50kgf / mm 2的复合材料的前体的方法,其平均表面空隙直径为0.01〜2μm,通过将浓度为 光学各向异性下限溶液浓度C2的1〜1.3倍,然后在不引起溶剂萃取的条件下吸收凝结剂,然后萃取溶剂,使溶液不可流动,制备平均厚度为 通过用聚合物或反应性分子的溶液浸渍该前体用于复合材料,其为2至200μm。
摘要:
Polybenzazole polymer dopes are spun through a spinneret having more than 2 per cm.sup.2, of orifices in relatively close proximity. The dope filaments formed, then pass through an air gap which has a temperature of 50.degree. to 100.degree. C. and a gas flow sufficient to uniformly reduce the temperature of the dope filaments. The filaments cool in the air gap and are then coagulated.
摘要:
To provide fibers which retain the excellent heat resistance and flame retardancy inherent in polybenzazole fibers and pyridobisimidazole fibers, have improved post-processability and neither necessitate considerable change in production process conditions nor require a high-temperature and long-time heating treatment. With respect to the polybenzazole fiber and pyridobisimidazole fiber, in an electron diffraction diagram of a surface layer part (from the surface to 1 μm) of the fibers, the fibers containing a crystal present in a state satisfying that S2/S1 is in a prescribed range, wherein S1 is a diffraction peak area derived from a crystal (200) plane and S2 is a diffraction peak area derived from a plurality of other crystal planes along an equatorial direction profile.
摘要:
Described is a continuous process for removing polyphosphoric acid from a polybenzazole dope filament, which comprises: (a) contacting the dope filament with water or a mixture of water and polyphosphoric acid under conditions sufficient to reduce the phosphorous content of the filament to less than about 10,000 ppm by weight; and then (b) contacting the dope filament with an aqueous solution of an inorganic base under conditions sufficient to convert at least about 50 percent of the polyphosphoric acid groups present in the filament to a salt of the base and the acid. It has been discovered that contacting the dope filament with a solution of a base after washing the filament to remove most of the residual phosphorous advantageously leads to an improvement in the initial tensile strength of the filament, as well as improved retention of tensile strength and/or molecular weight (of the polybenzazole polymer) following exposure to light and/or high temperatures.
摘要:
A viscoelastsicity measuring apparatus which includes a pair of sample holders, a sample clamping chuck, a detecting rod, a detecting rod support, a displacement detector, a force generator, a sine-wave generator, an amplifier and a heat source for heating the sample and which operates such that a sine-wave stress is induced in the sample and a strain generated in the sample due to the stress is detected so that the modulus of complex elasticity as a characteristic value of the viscoelasticity of the sample is measured on the basis of the amplitude of the stress and the phase difference between the stress and strain. Further, the sample holders are made resilient so that they can move in a direction normal to the sine-wave stress without loss while the extent of their movement in the direction of the stress is made so small as to be negligible, whereby any deformation of the sample due to a thermal expansion of the sample by heating is eliminated in the direction of the stress and strain detection, thereby improving the viscoelasticity measurement accuracy at a temperature different from the temperature at which the sample is set.
摘要:
A high strength polyethylene filament having tenacity of at least 15 cN/dTex, which comprises a polyethylene having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in a state of the filament, and containing 0.01 to 3.0 branched chains per 1,000 backbone carbon atoms. When cut fibers are obtained by cutting the polyethylene filament, a rate of dispersion-defective fibers is 2.0% or less.
摘要:
The present invention provides a method for producing a formed article from a dope comprising a polyphosphoric acid solvent and a polymer soluble in polyphosphoric acid, which includes using a production apparatus containing an apparatus for stirring and uniformly dispersing or homogenizing a dope and a pump apparatus for delivering the uniformly dispersed or homogeneous dope, wherein at least one of the apparatus and the pump apparatus has a part that comes into contact with the dope. According to the present invention, maintenance frequency of production facility due to the corrosion and elution of metal in a recovered solvent can be reduced, which in turn decreases the production cost.
摘要:
A polybenzazole fiber characterized by having an elastic modulus of not less than 1350 g/d and requiring not longer than 10 minutes to reduce its water content from 2.0% to 1.5%, when determined using a thermogravimetric analyzer at 110.degree. C. after moisture absorption of not less than 2.0% of a fiber, and a method for manufacturing such a polybenzazole fiber, comprising extruding a spinning dope comprising polybenzazole and a polyphosphoric acid from a spinneret to give a dope filament, and cooling the dope filament to not more than 50.degree. C., followed by coagulation and washing. According to the method of the present invention, a polybenzazole fiber showing less decrease in strength by rapid heating can be provided.