Filler migration

Uses Filler, flatting agent, rheology control agent in agric., asphalt, roof coatings, catalysts, cemenL dental, paints, paper, plastics, polishes, cleaners, caulks, adhesives, sealants, encapsulants filler migrating to... 

Using a dynamic mechanical thermal analysis technique the effects of fillers and rubber polarity on the distribution of filler in butadiene/nitrile rubber blends were investigated. Carbon black and silica were the fillers investigated. Filler migration between polymers was also shown. 12 refs. 

Filler Migration in Natural Rubber Blends During the Mixing Process... 

Sirisinha et al. studied the effects of filler and mbber polarity on the distribution of filler in BR/NBR blends, using the DMTA technique. As 30-phr filler is added, the reduction in heights of tan 5 is attributed to the dilution effect. It has also been also found that small and large particle sized carbon black prefer to reside in BR phase compared NBR phase in the blends because of the lower viscosity and lower polarity of the BR phase. The addition of silica instead of carbon black leads to an increase in filler migration to the NBR in the 20/80 BR/NBR blend, which is attributed to the strong silica-NBR interaction. In addition, an increase in NBR polarity promotes carbon black migration to the BR phase. 

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