\
to solve specialized
1
I&EC REPORTS
PREDICTING POLYMER STABILITY
rhermogravimetric analyses in vacuum olve the problem of inconsistent reults from tests to predict thermal tability in certain coordination polyzers
...f o r r e m o v a l o f i n o r g a n i c solids from aqueous solutions and from organic products, removal of ash from food products, of ionic products from n o n - i o n i c p r o d u c t s ; and f o r s e p a r a t i o n o f s p e c i f i c ions from ionic or n o r i o n i c ma. terials. WC-111A
CONTRAFLUX .
for removal of specific organic substances through ads o r p t i o n A c t i v a t e d carbon utilized to decolorize sugar, purify organic chemicals by removing foreign color and odor, remove trace quantities of im purities from process liquors, p u r i f y a l c o h o l i c beverages, pharmaceuticals, and biological products WC-132
DIALYSIS for removal of salts, acid or alkalis from colloidal or non ionic solutions, and recovery of acids from process solutions wc-121
L.
CLARIFICATlON A N D FILTRATION for removal of suspended solids of the minutest particle si
Contradictory results reported fox he thermal stability of metal comilexes of 8-hydroxyquinoline anc Ither types of coordination com. ,ounds apparently result from mak. ng the weight-loss analyses in air ccording to E. Horowitz of thc qational Bureau of Standards anc ’rofessor T. P. Perros of Georgc Yashington University. Comparison of results obtainec n air and those obtained in vac ium disclosed a consistent relatior )etween the thermal stability of tht :oordination polymers and tht itomic number of the central metal Turther experiments conductad b! qorowitz and Perros, in which di ialent manganese, cobalt, nickel :opper, and zinc were combine( uith bis(8-hydroxy-5-quinolyl)-meth me, purified, and subjected tc ieating from room temperature tc 1000” C. in a vacuum chambe mm. Hg) equipped with ai :lectronic balanca, also yielded con .istent results. Evaluation of th’ decomposition temperatures for a1 If the coordination polymers showec :hat their thermal stabilities hac :he sequence: Mn > Co > Ni > Cu > Zn. The average values of the de :omposition temperatures wer plotted against the atomic number c the central metal and yielded linear relationship for all metal except zinc. The departure c zinc from the linear relationship i Explained on the basis of the periodi properties of the metal. These studies should provide mor understanding of factors governin the properties of coordination poly mers and may lead to polymer with better heat resistance. I
J. H. S. HAGGI Circle NOS.76, 77, 78, 79 on Readers’ Service Card
Rheological problems? Next time ask the men who know. Viscosity is our only business. Undoubtedly, in 25 plus years of experience we’ve encountered and solved just about any rheological problem you might have. Without obligation ask a b o u t . .
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CUSTOM SERVICE. T h e Brookfield Rheology Center will provide custom viscosity measurements for you without charge to evaluate Brookfield instruments for purchase. This is probably the most completely equipped laboratory of its kind in the world. TECHNICAL I NFORMATION, from the specialized Brookfield library on Rheology, is yours t o draw upon free. Technical publications and articles o n all kinds of rheological subjects are available at no charge in reasonable quantities.
INSTRUMENT EVALUATION. If you suspect a Brookfield viscometer can be valuable to you, ask for one. We’ll gladly arrange a 30-day trial. No charge.
VISCOMETER SERVICE, seldom required for Brookfield instruments, is available at low cost. One-day repairs are standard. Loan instruments supplied if required. [All Brookfield equipment is guaranteed against defective materials and workmanship for 1 year).
Next Time, Ask Brookfield First! WORLD’S STANDARD FOR VISCOSITY MEASUREMENT-CONTROL
&oolfield ENGINEERING LABORATORIES INC. STOUGHTON 52, MASSACHUSETTS
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VOL. 5 6
NO. 4
APRIL
1964
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