By polymerizing phenyl or n‐butyl isocyanate in various solvents in the presence of anionic catalysts such as lithium or sodium alkyls, crystalline polymers were obtained. For both polymers, the I.R. spectra, the X‐ray diffraction spectra and other physical properties are reported. The possible structures of the two crystalline polymers are discussed. By cationic catalysts (e.g. AlBr3) amorphous polymers were obtained from phenylisocyanate, but no polymers from n‐butylisocyanate.

synopsis T h i s study was undertaken to measure quantitatively the flammability characteristics of cotton and polyester fibers. The smoke density generated during the burning of these fabrics was also studied a t various temperature conditions. A mathematical relationship was established between the results obtained in an oxygen-depleted atmosphere chamber and those obtained in a chamber in which there was constant repIenishing of an oxygen and nitrogen atmosphere. Three commercially available flame-retardant treatments were utilized in this study. The effect of temperature as well as the influence of fabric weight on the flammability behavior and the smoke density of these fabrics were investigated. A novel instrument built according to ASTM standards was employed throughout this study; it was found to be versatile, convenient, and highly reproducible in the generation of the data. It was found that polyester fabrics generate far more smoke than cotton fabrics without the phenomenon of afterglow. It was found also that aa the temperature increases, the smoke density of cotton fabrics increases as well, but in the case of polyester fabrics the opposite relationship was obtained.

This study was undertaken to measure quantitatively the effect of temperature on the oxygen index values of several fabric samples of cotton, polyester, and their blends. The smoke density generated during the burning of these fabric samples at their oxygen indices was also studied at various temperature conditions. The results indicate a definite rela tionship of burning behavior with temperature, fabric weight, and composition of the blends. Two commercially avail able flame-retardant finishes were employed in this comparative flammability study of treated and untreated specimens. A novel instrument, which complies with standard laboratory procedures, was employed throughout this study, and it was found to be versatile, convenient, and highly reproducible in the generation of the data.

The reaction of two molecules of AlRCl2 with an electron donor molecule D, gives rise to the practically quantitative formation of AlR2Cl and AlCl3.D. This can explain the catalytic activity in the stereospecific polymerization of propylene to isotactic polymer of the systems prepared from violet TiCl3, AlRCl2, and an electron‐donor substance. These systems have the same degree of stereospecificity as the systems consisting of AlR2ClTiCl3 (violet).

113) has two helical axes: about one it has secM, and about the other secP-helicity. All D3 structures, without exception, contain four helical axes. One of these is coincident with the three-fold axis of symmetry. None of the other three helical axes is co-incident with any of the three two-fold axes of symmetry. Model (114) is an example: with respect to the helical axis co-incident with the three-fold symmetry axis, it has secM-helicity : with respect to any of the other three helical axes, it has secP-helicity. The former assignment of helicity will probably be preferred on grounds of obviousness, but it is clearly not definitive unless the relevant axis of helicity is specified.

The free radical induced addition of acetic acid and its derivatives to olefins has been reported recently. As an extension of this reaction, the addition of acetic acid to acetylenic compounds was investigated.Adipic acid was found to be the major product of the reaction of excess acetic acid and acetylene a t 110-120 "C under pressure in the presence of organic peroxides. A second oily acidic product with a molecular weight of about 300, not yet identified, was found to the extent of about 2 parts by weight to every 3 parts of adipic acid.Octen-3-oic acid and its anhydride were synthesized from hexyne-1 and excess acetic acid in the presence of organic peroxides. Acetic anhydride was substituted for acetic acid, with the net advantage that acetylene was more soluble in the solvent. The general scope of the reaction was expanded to include other transfer agents, such a s acetone, formic acid, and propionic acid.

Crystalline copolymcrs of 3-methylbutene and 2,4-dimethyl-2,7-octadien: and 2,6dimethyl-2,7-octadiene, respectively, were obtained in yields of 28-40 yo. The copolymers, which were prepared in n-heptane with ZIEGLER-NATTA catalysts at 25OC. were insoluble in chlorinated organic solvents, had sharp, crystalline melting points and were melt-spun into fibers. Quantitative analysis of the substituted aouble bond present in these copolymers were made by the bromination reaction and by use of the molar absorptivity of the R'CH=CR'R" unsaturation using the 2,4-dimethyl-2,7-octadiene polymer as reference. The chemical structure of these copolymers has been documented by their X-ray diagrams and infrared spectra. ZUSAMMENFASSUNG:Kristalline Copolymere von 3-Methylbuten rnit 2,4-Dimethyl-2,7-octadien oder 2,6-Dimethyl-2,7-octadien wurden mit 28-40-proz. Um:atz hergestellt. Die bei einer Temperatur von 25OC in n-Heptan mit ZIEGLER-NATTA-Katnlysatoren hergestellten Copolymeren sind in chlorierten organischen Losungsmitteln unloslich, bePitzen scharfe kristalline Schmelzpunkte und wurden aus der Schmelze in Fasern versponnen. Die quantitative Analyse der substituierten Doppelbindung in diesen Copolymeren wurde mit Hilfe der Bromierungsreaktion und durch Messung dcr molaren Absorption der R'CH=CR'R"'-Doppelbindung im Vergleich mit 2,6-Dimethyl-2,7-octadien durchgefiihrt. Die chemische Struktur der Copolymeren wird mit Hilfe von Rontgendiagrammen und IR-Spektren aufgeklart .While there exists a large amount of literature on the polymerization of vinyl compounds, relatively little has been published on the polymerization of conjugated diolefins with stereospecific catalysts.Recently, MAKOWSKI et aZ. l) have described the preparation of 1,5hexadiene polymers with a number of modified alkyl metal coordination catalysts. These polymers are crystalline, have high tensile strengths, high melting points and yet are very flexible. The mechanism of polymerization 'follows the one proposed in 1957 by BUTLER^). I n 1958 MARVEL and STILLE~) reported on the preparation of a-diolefins of the general formula CH2=CH(CH2),CH=CH,, where n is equal to 4-18. The poly-*) Revidiertes Manuskript vom 8. Januar 1966.

No abstract