Perkin-Elmer Analytical News
WAVELENGTH (MICRONS) The resins were m i x t u r e s o f t r i a l l y l c y a n u r a t e a n d an u n s a t u r a t e d poly ester. W i t h t h e exception o f t h e b a n d at a b o u t 10.1/t, t h e s p e c t r u m o f t h e polyester c h a n g e d very l i t t l e d u r i n g c u r e , a t least u n t i l t h e t e m
perature was so high t h a t t h e r m a l d e g r a d a t i o n b e g a n . T h e p r e d o m i n a n t changes in t h e s p e c t r u m were due t o p o l y m e r i z a t i o n a n d i s o m e r i z a t i o n of the t r i a l l y l c y a n u r a t e .
WAVELENGTH (MICRONS) T h e early stages of p o l y m e r i z a t i o n m a y be f o l l o w e d b y e x a m i n a t i o n o f t h e b a n d s a t Ι Ο . Ι μ a n d 10.7/t; t h e f i r s t , of h y d r o g e n v i b r a t i o n s a r o u n d t h e d o u b l e b o n d s in both t h e polyester and TAC, t h e second being due
t o TAC u n s a t u r a t i o n alone. Reversal o f relative i n t e n s i t i e s o f these bonds i n d i c a t e s a p r e f e r e n t i a l p o l y m e r i z a t i o n of t h e polyester, w h i l e over all r e d u c t i o n in i n t e n s i t y i n d i c a t e s p o l y m e r i z a t i o n of s o m e o f t h e TAC.
WAVELENGTH (MICRONS) In later stages o f p o l y m e r i z a t i o n , r e a r r a n g e m e n t of t h e TAC t o t r i a l l y l i s o c y a n u r a t e o c c u r r e d . This m a y be seen b y t h e r e d u c t i o n in i n t e n s i t y , a n d f i n a l l y d i s a p p e a r a n c e , o f t h e TAC r i n g b a n d s a n d t h e r e d u c t i o n o f
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ANALYTICAL CHEMISTRY
t h e ether l i n k a g e b a n d a t 8.8/1. S i m u l t a n e o u s l y , TAIC r i n g bands a p p e a r at 6.9// a n d 13.1/x and a TAIC c a r b o n y l b a n d a t 5.9/i, a l t h o u g h t h i s b a n d is s o m e w h a t o b s c u r e d b y t h e polyester c a r b o n y l b a n d .
