NOWMEASURE ENERGY TRANSITIONS DIRECTLY IN CALORIES! T h e M o d e l DSC-1 D i f f e r e n t i a l S c a n n i n g C a l o r i m e t e r measures e n e r g y transitions
d i r e c t l y in calories, a n d p r o d u c e s results s i m i l a r t o c l a s s i c a l d e t e r m i n a t i o n s in a f r a c t i o n o f the time. Heats of fusion, specific h e a t , glass t r a n s i t i o n s , heats o f re action, and combustion energy—character izing catalyst activity, curing rate, thermal stability a n d degree of crystallinity — a r e m e a s u r a b l e b y this n e w instrument.
t a k e s s a m p l e s as s m a l l as 0.1 m g , a n d o p e r a t e s in v a c u u m o r inert a t m o s p h e r e . The DSC-1 resolves transitions less t h a n 0 . 5 ° K a p a r t , a n d analyzes effluentsamples w i t h a t h e r m a l c o n d u c t i v i t y cell. N o refer ence c o m p o u n d is r e q u i r e d . Samples m a y be o p e n o r sealed l i q u i d , p o w d e r o r f i l m . T e m p e r a t u r e is d i r e c t l y r e c o r d e d .
In a d d i t i o n to p r o v i d i n g direct c a l o r i e meas u r e m e n t , the DSC-1 w i l l scan up o r d o w n in the r a n g e o f 173°K t o 7 7 3 ° K , w i t h linear scan rates f r o m 0 . 6 2 5 ° K t o 8 0 ° K / m i n . It
Free —Differential Scanning Calorimetry b o o k l e t . W r i t e t o t h e Instrument D i v i s i o n , Perkin-Elmer Corporation, 751 Main Avenue, N o r w a l k , Connecticut.
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Thermograms illustrate crystal transitions of ammonium nitrate. Peak areas yield the transition energies shown.
315
353
398
Top chart is thermogram of polyethylene terephtalate. Peak areas correspond to transition energies as shown. Bottom run is anisaldazine.
9.5 cal/g
443
Crystallization
(3-to-a rhombic
Y8
