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The reaction of diatomic organosilicon alcohols with diisocyanates
Abstracts
17 5
fiber was found to be heterogeneous, the basic stem and surface sheath reacting differently towards elevation of temperature. I t has been suggested t h a t the cause for a decrease in elasticity of these fibers on heating while their strength remains unchanged m a y be rapid crystallization in the isotropic surface film during the heating process. ON THE STRUCTURE OF PLASTIC SCINTILLATORS--III. INVESTIGATION OF THE TEMPERATURE DEPENDENCE OF THE REFRACTIVE INDEX AND DETERMINATION OF THE TRANSITIONS WITH RESPECT TO TEMPERATURE
E . E . B a r o n i , V y s o k o m o l . s o e d i n . 3: N o . 7 , 9 5 6 - 9 5 9 , 1961. THE internal structure of polystyrene scintillators (PS) is discussed on the basis of the optical determination of various transition points. Refractive index d a t a have confirmed the invalidity of the proposition t h a t the organic phosphors admixed with styrene copolymerize with the latter. The measurements show t h a t the additions do not affect the PS transition points. *DAMAGE TO POLYSTYRENE BY IONIZING RADIATION E . E . B a r o n i , V y s o k o m o l . s o e d i n . 3: N o . 6, 9 6 0 - 9 6 5 , 1961.
DECREASE in luminescence yield of polystyrene scintillators is the direct result of radiation damage. The impairment is due to chemical change of tile scintillator body, two different reactions taking place, namely: condensation in the bulk of the polymer caused b y the radicals formed and oxidation of the surface layers of the scintillator (or polystyrene) due to the presence of air. Aldehyde and carboxyl groups were the oxidation end products at the polymer surface. *THE REACTION OF DIATOMIC ORGANOSILICON ALCOHOLS WITH DIISOCYANATES
K . A. A n d r i a n o v a n d L . I. M a k a r o v a , V y s o k o m o l . s o e d i n . 3: N o . 7 , 9 6 6 - 9 7 0 , 1961. THE reaction of diatomic organosilicon alcohols of the structure
HOCHsCHIOCHaSiO--
I
sOCHgCH2OH
CHa with hexamethylene- and toluylenediisocyanates has been investigated. Rubber-like polymers have been obtained and the thermomechanical properties of some of them have been presented. REACTION BETWEEN POLYVINYLCHLOROACETATE AND SOME AMINES
E . N . R o s t o v s k i i , O. V. S h c h e l k u n o v a a n d N . S. B o n d a r e v a , V y s o k o m o l . s o e d i n . 3: N o . 7, 9 7 1 - 9 7 5 , 1961. THE conditions of r0action between vinylchloroacetate polymer and aniline, piperidine and pyridine have been investigated. I n the presence of excess amine linear polymers have been obtained. These include polyvinylpiperidylaeetate, polyvinylacetatepyridiniumchloride, The Publisher will be pleased to quote for the supply of a full English translation of a n y papers abstracted in these pages.
17 5
fiber was found to be heterogeneous, the basic stem and surface sheath reacting differently towards elevation of temperature. I t has been suggested t h a t the cause for a decrease in elasticity of these fibers on heating while their strength remains unchanged m a y be rapid crystallization in the isotropic surface film during the heating process. ON THE STRUCTURE OF PLASTIC SCINTILLATORS--III. INVESTIGATION OF THE TEMPERATURE DEPENDENCE OF THE REFRACTIVE INDEX AND DETERMINATION OF THE TRANSITIONS WITH RESPECT TO TEMPERATURE
E . E . B a r o n i , V y s o k o m o l . s o e d i n . 3: N o . 7 , 9 5 6 - 9 5 9 , 1961. THE internal structure of polystyrene scintillators (PS) is discussed on the basis of the optical determination of various transition points. Refractive index d a t a have confirmed the invalidity of the proposition t h a t the organic phosphors admixed with styrene copolymerize with the latter. The measurements show t h a t the additions do not affect the PS transition points. *DAMAGE TO POLYSTYRENE BY IONIZING RADIATION E . E . B a r o n i , V y s o k o m o l . s o e d i n . 3: N o . 6, 9 6 0 - 9 6 5 , 1961.
DECREASE in luminescence yield of polystyrene scintillators is the direct result of radiation damage. The impairment is due to chemical change of tile scintillator body, two different reactions taking place, namely: condensation in the bulk of the polymer caused b y the radicals formed and oxidation of the surface layers of the scintillator (or polystyrene) due to the presence of air. Aldehyde and carboxyl groups were the oxidation end products at the polymer surface. *THE REACTION OF DIATOMIC ORGANOSILICON ALCOHOLS WITH DIISOCYANATES
K . A. A n d r i a n o v a n d L . I. M a k a r o v a , V y s o k o m o l . s o e d i n . 3: N o . 7 , 9 6 6 - 9 7 0 , 1961. THE reaction of diatomic organosilicon alcohols of the structure
HOCHsCHIOCHaSiO--
I
sOCHgCH2OH
CHa with hexamethylene- and toluylenediisocyanates has been investigated. Rubber-like polymers have been obtained and the thermomechanical properties of some of them have been presented. REACTION BETWEEN POLYVINYLCHLOROACETATE AND SOME AMINES
E . N . R o s t o v s k i i , O. V. S h c h e l k u n o v a a n d N . S. B o n d a r e v a , V y s o k o m o l . s o e d i n . 3: N o . 7, 9 7 1 - 9 7 5 , 1961. THE conditions of r0action between vinylchloroacetate polymer and aniline, piperidine and pyridine have been investigated. I n the presence of excess amine linear polymers have been obtained. These include polyvinylpiperidylaeetate, polyvinylacetatepyridiniumchloride, The Publisher will be pleased to quote for the supply of a full English translation of a n y papers abstracted in these pages.