By Raymond B. Seymour

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The load bearing properties, thus, are not fully used without fiber bonding. The effect of bonding is also illustrated by the stressstrain curve in Fig. 8, which relates again to a mill oriented unidirectional composite with direction of the test being the predominant fiber direction. Thus, improved short fiber/elastomer composites are obtained by increasing the adhesion between the fiber surfaces and the elastomeric matrix with fiber bonding agents. NeedĀ­ less to say, the integrity of the bond must persist throughout the life of the elastomer article.

Right Side Up Mix" 1) Add treated cellulose fibers and elastomer, mix 1 minute. 2) Add softeners, activators, and fillers and mix 2-3 minutes. 3) Add curatives, and methylene donor, mix 1-2 minutes and dump. For orienting the fibers, the unvulcanized composite is fed through pairs of calender rolls, each pair set about 30% closer than the previous pair. The last pass is an exception, however, in that the rolls are set only slightly closer than the previous pair. This improves the appearance of the calĀ­ endered composite sheet.

Short fibers have b e e n embedded into many types of p o l y m e r s for 2 p r i n c i p l e r e a s o n s : 1) to r e d u c e the cost of m o l d e d a r t i c l e , 2) to improve and m o d i f y c e r t a i n m e c h a n i c a l p r o p e r t i e s of the m a t r i x p o l y m e r to make it s u i t a b l e for s p e c i f i c u s e . A l p h a c e l l u l o s e is w i d e l y used in p h e n o l i c and u r e a f o r m a l d e h y d e type p l a s t i c s to i n c r e a s e the s t r e n g t h of the m o l d e d p a r t .

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