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By William J. Bailey

The U. S. -Japan Polymer Symposium-1980 on the 10th Biennial Symposium used to be held in the course of the interval November 21-26, 1980 on the Palm Springs Spa lodge in Palm Springs, California. This Symposium used to be together subsidized by way of the department of Polymer Chemistry of the yankee Chemical Society and the Society of Polymer technology, Japan. it truly is was hoping that this joint symposium among the japanese and americans becomes a standard occasion with the subsequent sym posium to be held in Japan. even if there were numerous small joint conferences among the japanese and American poly mer scientists backed by way of the governments of the 2 international locations with limited subject matters and constrained attendance held in either nations, this symposium represented the 1st huge assembly held in cooperation among the 2 societies with extensive spectrum of issues and unrestricted attendance. In making plans this system the Co-Chairmen, William J. Bailey and Teiji Tsuruta, attempted to make this system as balanced as attainable, either just about subject material and illustration from the 2 international locations. they chose 24 invited academics, twelve from Japan as follows: Kohei Sanui, Sophia collage Takeo Shimidzu, Kyoto collage Shohei Inoue, college of Tokyo Itaru Mita, college of Tokyo Yuka Yamashita, Nagoya collage Yozo Chatani, Osaka college Itsuo Aishima, Asahi Chemical Co., Ltd. Toshio Hayashi, Kyoto college Takuhei nostril, Tokyo Institute of expertise Tisato Kajiyama, Kyushu collage Shigeo Tazuke, Tokyo Institute of know-how Naohiro Murayama, Kureha Chemical CO., Ltd.

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Can this be partly responsible for the increasing rigidity of the collagen fibers within us as we get older? ) THE TERMINAL REGIONS The terminal regions of each chain contain a total of only 41 residues (in calf skin collagen). There are only four proline residues and no hydroxyprolines. It seems likely that the chains in these regions are similar to those in the regular regions, except for departures from strict adherence to the one-residue-per-turn requirement. CONFIRMATION OF THE PROPOSED STRUCTURE PATTERN Insofar as I have been able to determine, my new structure model agrees, at I east as well as the rope models, with the experimental data in the literature.

The reaction of methyl a-bromoisobutyrate with the zinc/copper couple gave in good yield methyl 2,2,3,3tetramethylsuccinate which on reduction yielded 2,2,3,3tetramethylbutanediol-l,4. Reaction wlth p-toluenesulfonyl chloride (tosyl chloride) (TSC1) gave in excellent yield the tosylate which could be treated with tetrabutylammonium bromide in dimethyl acetamide and gave in more than 60% yield the desired 1,4-dibromo-2,2,3,3-tetramethyl butane. Treatment of this dibromide with sodium gave a sticky, colorless material whose analysis showed it to be H-H PIB.

H-H linkages have also been observed in polymers other than polymers consisting exclusively of carbon atoms in the polymer backbone, for example, in poly(propylene oxide) (7) obtained by ring opening polymerization and also in some condensation polymers (8} which have an asymmetry in the monomer units. Considerable efforts have been made in the last few years to synthesize pure H-H polymers of common important polymers, to study their chemical, physical and mechanical properties, their thermal degradation behavior, and to compare these properties with those of the corresponding known H-T polymers (9).

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