The reaction of poly (epichlorohydrin) with Mg in tetrahydrofuran at the reflux temperature was studied for the purpose of preparation of a polymeric grignard reagent. The polymeric grignard reagent was not obtained, but dechlorination occurred. It was confirmed that the grignard reagnet of poly (epichlorohydrin) was formed as an intermediate product of dechlorination.
Furthermore, the reaction of poly (epichlorohydrin) with grinard reagent was carried out in tetrahydrofuran at the reflux temperature. Benzylmagnesium chloride and allylmagnesium chloride were used as grignard reagents. It was found that the chlorie atom in poly (epichlorohydrin) could be substituted with benzyl and allyl groups. The extent of the substitution increased with the increase in the concentration of grignard reagent. Dechlorination and scission of ether linkage occurred simultaneously with the side reaction.

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The binary and the ternary blends of PE, PP and EPR were carried out by means of open rolls. Some physical properties, such as stress strain and rigidity-temperature relations, were measured on the blends of these polymers over the whole range of the blend ratio.
It was found that the blends of these polymers containing EPR resulted in low rigidity, high toughness and high impact strength and that EPR which included both the same segments as PE and PP was an effective component to obtain the ternery blends with good mechanical properties.

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The binary and the ternary blends were made from PE, PVC and CPE of different contents of Cl by means of open rolls. Some physical properties, such as stress-strain and rigidity-temperature relations, were measured on the blends of various ratios, of these polymers, respectively.
Increased content of Cl in CPE would induce a homogeneous dispersion of CPE into PVC but would not induce a homogenious dispersion of CPE into PE. Moreover, the ternary blends, PE-CPE-PVC, did not give high toughness to articles made from such blends.

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Mechanical properties of the blends of polyethylene with various vinyl polymers and of the blends containing inorganic substances were studied from the stress-strain and the rigidity-temperature relations.
As the result, heterogeneous belends were obtained from PE-PS, PE-PMMA and PE-PVAc, respectively. PE-EVAc, however, gave nearly homogeneous blends. On the other hand, some of alcoxysilicas, being rigid fillers, made blends having good properties. This fact could be accounted for by surface interaction between alcoxysilicas and PE.

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Based on the consideration that the phenomena of fracture of rubber vulcanizates are extremal, the third asymptote of the smallest values has been applied to the distribution of tensile data of SBR vulcanizates. The influences of some factors such as rubber polymers, curing systems, fillers, and testing conditions on the distribution of tensile data have also been investigated. The assumed systematic behaviours of these factors can give the reasonable explanation for the application of this function to the distribution of observations.
As a result of this series of papers, the conceptual distribution function is derived herein by using the largest flaw theory. The following are postulated through this study: The rubber vulcanizates fractures at the location of the largest flaw contained in the matrices and in a brittle behavior at a given strain rate under tension. Then, the physical implications on these parameters, including the size effects on the distribution of tensile data can be explicitly explained.

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