- Email: [email protected]
Adhesion to glass of thermosetting resins
598
Abstracts
phous substance. The glass transition point Tg is - - 5 °. The temperature dependence of the elasticity modulus is given by the formula E = 45000-- 110 t. The thermal stability and elasticity modulus of amorphized specimens are respectively equal to 8 ° a n d 18-20 kg/cm ~, whereas for the crystalline specimens they equal 174 ° and 9000-1200 kg/cm ~. The flow temperature T! as function of the reduced viscosity of the polymer is given b y the formula TI= 173+ 202 log t/. I n order to estimate the crystallization rate the dependence of the elasticity modulus of amorhous specimens upon the time v of their stay in the crystallization bath has been determined within the temperature limits 15 to 80% The dependence has been found to obey the following equation:
El--E° x e-c~) where E 1 a n d E o are correspondingly equal to 9000 kg/cm ~ a n d 18 kg/cm 2. The dependenee upon the temperature of the constant c, characterizing the crystallization rate is given by the formula: c = 126 x 10-9 (t-5)4"°a. ON THE CAUSES FOR THE APPEARANCE OF STRESS RECESSIONS IN THE STRESS -STRAIN CURVES OF GLASS POLYMERS
V. R . R e g e l ' a n d D i n S h u S h e n ' , V y s o k o m o ] . s o y e d . 5: N o . 2, 2 5 8 - 2 6 1 ,
1963.
TH~ causes for the peaks in the stress-~train curves of glass polymers have been examined. The appearance of the peaks on compresions curves cannot be explained by the same causes as for stretching curves. The appearance of stress recessions on the compression curves is not due to geometric effects b u t indicates changes in structure of the specimens in the course of their deformation. THE STRESS DEPENDENCE OF RUPTURE TIME IN THE CRACKING OF RUBBERS IN CORROSIVE MEDIA
Y u . S. Z u y e v , S. I . P r a v e d n i k o v a a n d T. V. L i k h t m a n , V y s o k o m o ] . s o y e d . 5: N o . 2, 2 6 2 - 2 6 8 , 1963. THE lifetime (vp) of rubbers in the presence of ozone under conditions of low a n d below rupture deformations at which their effect on the structural changes in the rubbers can be neglected, obeys the equation r p ~ B J -b. The change in slope of the straight lines depicting the relation log ~p--log J on change in rubber composition a n d in other cases is associated either with change in chemical activity of the material, or with change in uniformity of stress distribution, as well as in the magnitude of molecular interaction. The data obtained show that the corrosive breakdown of rubbers under stress is a unique form of static fatigue. w
ADHESION TO GLASS OF THERMOSETTING RESINS
U . Ye. G u l ' , Ye. E . Z a b o r o v s k a y a , E . P . D o n t s o v a a n d B. G. B u b n o v a , V y s o k o m o l . s o e y d . 5: N o . 2, 2 6 9 - 2 7 3 , 1963. THE adhesion of thermosetting resins to glass was investigated b y the method of pulling off the resins set on glass fabric or glass film. The results obtained were compared with the strength parameters of the corresponding glass reinforced laminates. A relation was found to exist between the work of adhesion of the resin a n d glass film and the strength of the corresponding laminates.
Abstracts
phous substance. The glass transition point Tg is - - 5 °. The temperature dependence of the elasticity modulus is given by the formula E = 45000-- 110 t. The thermal stability and elasticity modulus of amorphized specimens are respectively equal to 8 ° a n d 18-20 kg/cm ~, whereas for the crystalline specimens they equal 174 ° and 9000-1200 kg/cm ~. The flow temperature T! as function of the reduced viscosity of the polymer is given b y the formula TI= 173+ 202 log t/. I n order to estimate the crystallization rate the dependence of the elasticity modulus of amorhous specimens upon the time v of their stay in the crystallization bath has been determined within the temperature limits 15 to 80% The dependence has been found to obey the following equation:
El--E° x e-c~) where E 1 a n d E o are correspondingly equal to 9000 kg/cm ~ a n d 18 kg/cm 2. The dependenee upon the temperature of the constant c, characterizing the crystallization rate is given by the formula: c = 126 x 10-9 (t-5)4"°a. ON THE CAUSES FOR THE APPEARANCE OF STRESS RECESSIONS IN THE STRESS -STRAIN CURVES OF GLASS POLYMERS
V. R . R e g e l ' a n d D i n S h u S h e n ' , V y s o k o m o ] . s o y e d . 5: N o . 2, 2 5 8 - 2 6 1 ,
1963.
TH~ causes for the peaks in the stress-~train curves of glass polymers have been examined. The appearance of the peaks on compresions curves cannot be explained by the same causes as for stretching curves. The appearance of stress recessions on the compression curves is not due to geometric effects b u t indicates changes in structure of the specimens in the course of their deformation. THE STRESS DEPENDENCE OF RUPTURE TIME IN THE CRACKING OF RUBBERS IN CORROSIVE MEDIA
Y u . S. Z u y e v , S. I . P r a v e d n i k o v a a n d T. V. L i k h t m a n , V y s o k o m o ] . s o y e d . 5: N o . 2, 2 6 2 - 2 6 8 , 1963. THE lifetime (vp) of rubbers in the presence of ozone under conditions of low a n d below rupture deformations at which their effect on the structural changes in the rubbers can be neglected, obeys the equation r p ~ B J -b. The change in slope of the straight lines depicting the relation log ~p--log J on change in rubber composition a n d in other cases is associated either with change in chemical activity of the material, or with change in uniformity of stress distribution, as well as in the magnitude of molecular interaction. The data obtained show that the corrosive breakdown of rubbers under stress is a unique form of static fatigue. w
ADHESION TO GLASS OF THERMOSETTING RESINS
U . Ye. G u l ' , Ye. E . Z a b o r o v s k a y a , E . P . D o n t s o v a a n d B. G. B u b n o v a , V y s o k o m o l . s o e y d . 5: N o . 2, 2 6 9 - 2 7 3 , 1963. THE adhesion of thermosetting resins to glass was investigated b y the method of pulling off the resins set on glass fabric or glass film. The results obtained were compared with the strength parameters of the corresponding glass reinforced laminates. A relation was found to exist between the work of adhesion of the resin a n d glass film and the strength of the corresponding laminates.