선상 폴리에틸렌의 전단응력하에서 결정화거동과 모폴로지(morphology)에 대해서 특별히 고안된 장치를 사용하여 고찰하였다. 전단응력에 의하여 폴리머 융체의 유동이 있게 되면 고분자물의 분자배향이 유동방향으로 일어나게 되고, 결정화 속도를 크게 가속하는 것을 볼 수 있었다. 낮은 전단응력을 부여하였을 때는 폴리에틸렌 결정은 a-축(a-axis) 배향이 이루어지지만 응력이 커질수록 c-축(c-axis) 배향이 명확해진다. 전단응력하에서의 결정화 과정중 신장된 형태의 도메인 구조(domain structure)가 나타남이 발견되었다. 도메인 구조는 엉성하게 형성된 폴드된 분자쇄(folded molecular chain)를 갖는 스택크드 라멜라(stacked lamella)와 비슷한 것으로 되어 있는데, 이는 로우스트럭처(row structure)의 선구자가 되는 것으로 볼 수 있다. 이러한 현상은 전단응력에 의한 결정화에 있어서, 비결정상(amorphous state)으로부터 결정상(crystalline state)으로의 전이 과정의 중간형태가 존재한다는 것을 의미한다.

To determine the degrees of the contribution of the various physical properties of the fabrics to their crease recovery, correlations between the 16 physical properties and crease recovery were experimentally analyzed on the 165 worsted sample fabrics by the KES-F System and the Monsanto crease recovery tester. Step-Wise Regression and Correlation Analyses were used to examine correlations between crease recovery and these physical properties. The regression formula was derived to estimate crease recovery from the given physical properties. Correlation coefficients between the estimates obtained by the formula and the experimental results were calculated. And the degrees of the contribution of the 16 physical properties to crease recovery were classified.

Crystalline dimethylol urea was synthesized, characterized, and used to react with n-dodecyl mercaptan and cotton cellulose in the presence of alkaline catalyst. The hydrolysis rate of dimethylol urea, the reactivity of dimethylol urea with n-dodecyl mercaptan, and the physical and chemical properties of dimethylol urea finished cotton fabrics in the presence of alkaline catalyst were investigated.

This research has been made to apply the kinetic model similar to the kinetics of consecutive first order reaction to the pilling mechanism. derivation of the theoretical equations estimating each stage, investigation of the validity of this model, and investigation of the relation between the pilling-resistance and the physical properties of fiber have been carried out. The kinetic model is well coincident with the pilling mechanism described by three stages. Parameters characterizing this model are the numbers of initial potential pills such as pillable fuzz, Cfo, and the relative rate constant, K, and these parameters can be calculated from the experimental values. As the tensile stress and the loop stain of single fiber decrease, the pilling-resistance increases because the relative rate constant increases and half wear-off time(HWT) decreases.

The changes of mechanical properties of poly(ethylene terephthalate) filament were studied in relation to crystallinity and structural factors, when it was drawn above Tg, 90$^{\circ}C$, and below Tg, 25$^{\circ}C$, at various draw ratio and it was heat set at 100$^{\circ}C$, 150$^{\circ}C$, 200$^{\circ}C$, While the yarn was 1)free to relax (FA), and 2) held taut at constant length (TA). The drawn samples at 25$^{\circ}C$ have higher strength, initial modulus and birefringence which indicated the overall orientation of drawn PET filament and have lower strain and crystallinity than those at 90$^{\circ}C$. And all of mechanical properties except breaking strain improved with increasing draw ratio. After heat-setting, the mechanical properties and structural factors were also shown similar behavior. For the effects of heat-setting temperature, the breaking strength and initial modulus decreased with increase in heat-setting temperature but the degree of crystallinity increased. The breaking strain of FA samples had no change by the heat-setting temperature because of the difference of heat-setting conditions. For the dependence of birefringence on the heat-setting temperature for free and taut annealed samples, the decrease of all the free annealed samples and the increase for taut annealed samples were expected results as also observed by other authors. On the base of abovementioned experimental results, the mechanical properties of drawn samples were affected by the overall molecular chain orientation rather than by the crystallinity of a polymer. And it was found that the samples drawn at high temperature had greater crystallinity than those at low temperature, even the samples with the same draw ratio.