Electrically conducting Poly(carbonate) (PC)/poly(pyrrole) (PPy) composite films were synthesized by exposing PC films containing ferric chloride as an oxidant to pyrrole vapour under various polymerization conditions. and their electrical conductivity and morphology were studied. After pyrrole was polymerized in PC matrix for two hours, the composite films showed the conductivity as high as 10-4~10-3S/cm and it increased with the concentration of the oxidant and the polymerization time and decreased with the polymerization temperature. Threshold conductivity was observed when the content of PPy in PC/PPy composite film was ca. 4.5~5 weight percent. The formation of PPy in PC matrix was confirmed by FT-IR spectra anal scanning electron micro-graphs. The x-ray diffraction curves indicated that talc structure or Pc/PPy composite film was amorphous. The conductivity increased one order of magnitude by mechanical stretching.

Photo-induced polymerization of DL-P-butyrolactone(BL) and its copolymerization with a-methylstyrene(MeSt) were carried out in the presence of diphenyliodonium hexarluorophosphate(salt). a wall known photocationic initiator. It has been fecund that oligo(hytlroty butyrdte) was obtained in high yield, however only oligomers with low molecular weight was results from this system. And an attempt to obtain talc polymer with high molecular weight by copolymerization with MeSt was not successful. This reveals that the reactivity of the cationic species, which is responsible for the cationic propagation of the BL. is so reactive that the propagating cationic species was not stabilized enough to depress the chain transfer reaction by ion pair formation with less nucleophilic hexafluorophosphate ion, supplied from the salt. The reactivity ratio of MeSt (r1) and BL(r2), calculated by Mayo-Lewis method, gave the values of 1.5 and 0.083, respectively.

Autocrosslinking reaction accompanied in polymeric reactions was investigated quantitatively. The degree of autocrosslinking was measured in chloromethylation of EGD crossliilked polystyreile. The finding from this study is that, in case of crosslinked polystyrene, the rate of autocrosslinking reaction of gel-type polystyrene is faster than that of macroporous-type. And the autocrosslinking reaction is terminaled in an hour from the initial reaction. In induced autocrosslinking of chloromethylpolystyrene obtained from polymerization of chloromethylstyrene monomer, initial autocrosslinking stage governs the whole crosslinking reaction so predominantly that the DVB and EGD crosslinking do not marc much difference. It is proved that the accompanying crosslinking reaction, introduced by the autocrosslinking. has a more significant elect on the polymeric reaction than the crosslinking agent used in chloromethylpolystyrene polymerization.

Poly(ethylene terephthalate) (PET) fibers have used widely as industrial materials; for example, tire cords and conveyor belts, etc., In the case of tire cords, fatigue resistance property is important because it is constantly flexed, extended and compressed in a tire. It was well known that long period of gibers affects fatigue resistance property. But how the effect of One structure affects the fatigue resistance property was not known accurately yet. So, in this study the changes of fine structure and the mechanical property of PET tire cord fibers, which have a various long period and is subjected by repeated extension fatigue were investigated to examine fatigue resistance property and fatigue mechanism at the initial fatiguing step. Three kinds of PET fibers with various draw ratio and spinning speed, provided by Toyobo Co., Ltd.. were used in this study. Repeated extension fatigue test of PET tire cord gibers was carried out under a cyclic extension of 2%(with an initial load of 2.5g, different number of fatigue cycle : 105~7$\times$105) with a frequency of 2-3Hz at room temperature. To investigate fatigue resistance property, molecular weight, density, wide angle X-ray diffraction, mechanical properties, surface of samples and the dynamic viscoelasticity measurements were carried out.

The intermolecular interchange reaction between poly(ethylene terephthalate) and poly(butylene terephthalate) was investigated by a spectroscopic method. The rates of direct ester-ester interchange and alcoholysis reactions were determined by using newly derived rate equations and analytical data of heterolinkages formed. The characterization of heterolinkages formed during the interchange reaction was carried out by means of carbon-13 UWR spectroscopy. It is concluded that the direct ester-ester interchange reaction is more prevailing than the alcoholysis reaction.

The swelling kinetics of HCSPAN was analyzed by the demand wettability(DW) method. It was influenced by the complex action of crosslinking density, ionic unit content and soluble polynler content related to alkaline hydrolysis conditions such as alkaline hydrolysis temperature. NaOH concentration and alkaline hydrolysis time. And it was also infiueneced by gel blocking which was related with the particle size. The moisture regain of HCSPAN was not high at even high relative humidity.

The rate equation of interchange reaction between poly(ethylene terephthalate) (PET) and poly(bury-lone terephthalate) (PBT) was derided considering the thermal degradation of heterolinkages formed. Experimental results fitted well with the revised equation. The change in molecular weight of PET and PBT during the melt processing was examined. It was found that the molecular weight of PBT decreased with the melt processing time. but that of PET increased with the time.

A study has been made on the die-swell and rheological properties of bicemponent polymer blends of low density polyethylene(PE), polypropylene(PP) and polystyrene(PS); PE/PP, PE/PS, and PP/PS. In the case of PE/PP blends the continuous phase transferred from PE to PP at the PE content of 60wt%. Meanwhile the PE/PS and PP/PS blends the continuous phase transferred from PE to PS and from PP to PS at the PS content of 60wt%. respectively. The die-swelling ratio. normal stress difference(N1) and dynamic shear viscosity of PE/PP blends appear, to show same tendency by chaneine the blend-ratios. For the cases of both PE/PS and PP/PS blends, where PE and PP are in the continuous phase, the die-swelling ratios increase as the N1 increases but decrease as the dynamic shear viscosity increases. But N1 of the PS has been found not to contribute to the die-swelling ratios when PS is in the continuous phase.