Additives for Plastics. New Developments by Raymond B. Seymour

By Raymond B. Seymour

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If needed, this anisotropy can be utilized in the designed performance. E. , azodicarbonamide) to silica-EVA composites produces cellular products. The extent of cell formation was measured as a function of the quantities of peroxide and blowing agent (Figure 3). Two properties, density and compression modulus, 2 BLOWING AGENT, PHI 3 FIGURE 3. Density (- -) and compression modulus ( - ) of cellular EVA-28 containing 30 phr HS-200 silica. Table VIII. 200 Silica, No Silane) Chopped Fiberglass, a phr ML (1+4) 1000 C.

Ester plasticizers added to these composites reduce low temperature stiffening. In order to maintain stiffness at ambient temperatures, additional silica must be added. This still results in a net improvement in low temperature stiffness (Table VII). At equivalent ambient temperature stiffness of 20,000 psi, the addition of dioctyl phthalate and HS-200 silica results in a significant reduction in flexural modulus at -400 c. Torsional modulus (plotted relative to that at ambient temperature) is shown for two of these compositions in Figure 2.

ACS C o a t i n g s & P l a s t i c s P r e p r i n t s , 36_ ( 2 ) , 804 ( 1 9 7 6 ) . 29. D e a n i n , R. , P a t e l , V. V . , and D r i s c o l l , S. B . , Mod. P l a s t i c s , 52^ ( 6 ) , 62 ( 1 9 7 5 ) . 3 0 . D e a n i n , R. , Shah, H. , and P a t e l , N. , SPE A N T E C , 2JL, 118 ( 1 9 7 5 ) . 3 1 . D a g d i g i a n , J. , and D e a n i n , R. , ACS C o a t i n g s & P l a s t i c s P r e p r i n t s , 3_5 ( 2 ) , 90 (1975) . 3 2 . D e a n i n , R. , B a r d o l i w a l l a , D.

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