Shigeyuki Ueda

The Thermal Behavior of Hexamethylene-Isocinchomeronamide, -Adipamide Copolymer

ヘキサメチレンーイソシンコメロナミド, -アジパミド共重合物についてその比容温度曲線を0℃付近から融点を越える温度付近まで求めた。融点一共重合組成関係はアイソモルヒズムが考えられるにもかかわらず, イソシンコメ獄ナミド30モル%に極小を示す。またこの融点一組成関係からFloryの式を用いてポリヘキサメチレンアジパミドの融解熱として10600cal/molを得た。この値を比熱法で求められている融解熱と比較すると一致する。しかし, 融点一共重合組成からFloryの式を用いての融解熱は比熱法によるよりも低い値を示すと考えられるので, この一致はむしろピリジン核のNの位置による異性化によって弱められてはいるが, なおアイソモルヒズムの存在することを思わせる。融解範囲は比熱法によるものと同程度の大きさで, イソシンコメロナミド50モル%付近で最大となる。同範囲内での比容変化は同じ30-50モル%で極小を示す。

Studies on the new polyamide-fibres with Pyridine Rings in the Main Chain. IV

Conditions for polymerization-condensation and the method of reaction ofcopolymerized polyamide having a pyridine ring in the main chain have beeninvestigated. Properties of polymerized products by use of an excess or deficient of amine against the ester were first investigated and it was found that asuperior product was obtained by selecting a strictly equimolar ratio or closeto it. It was also confirmed that n-butanol can be used as a solvent but 66-Nylon salt was unsuitable as a copolymerization-condensation raw material. Acomparatively large amount of a monomer was reacted in a small spinning potand it was found that using of a peculiar method of adding water as alreadyreported in the first of this series gave a high molecular polymerized fiberfree from coloration. Using of viscosity stabilizer ameliorated vigorous foamingduring the heating in vacuo but it also effected to prevent the reaction offorming of high molecular weight, therefore, its excessive use should be avoided. A suitable amount of methanol as a solvent and the amount of water to beadded were determined. The yield of polymer was increased somewhat byfeeding a slightly larger amount of prepolymer in the reaction vessel of thesame capacity. Since the fiber having a mechanical strength 5-6g/d andelongation 20-30% can easily be made experimetally, the superiority of thiscopolymerized polyamide fiber is much anticipated.