الفهرس 
contentsOnly 14 pages are availabe for public view
 |  | from | 273 |  |  |
| | | from | 273 | | |
Abstract
This research aims to study the different factors that affect the adhesion between acrylonitrile-butadiene copolymer and nylon 6,6 cord. In order to do this, two different grades of the polymer, namely, Krynac 40/50 and 34/50 (supplied by Polysar- France) were used. These two polymers have the same viscosity but different acrylonitrile contents. The textile cord used was either undipped or dipped in an RFL (Resorcinol Formaldehyde Latex) adhesive solution.
One of the main factors that is believed to affect the adhesion values to a great extent, is the crosslink density of the mix. The value of the crosslink density of each mix was calculated using stress-strain measurements and approximate relations between the adhesion strength and the crosslink density were concluded. Since rubber mixes used in adhesion purposes must be able to resist aging and other environmental values like the exposure to an ionizing radiation. Therefore the H-samples were exposed to heat aging at 90°C for different time intervals ranging from 1 to 8 days and to y-radiation doses ranging from 0 to 1 M rad, 1 x 10° rad= 1 x 10’ Gy. Most of the samples showed good resistance to aging and exposure to y-radiation. These results are very useful for engineering applications when these products are used at elevated temperature or ionizing chambers and autoclaves.
All the prepared mixes were vulcanized at 153°C under about 100 KN/m2 pressure for a time interval ranging from 10-15 minutes as recorded by the Monsanto Rheometr. The mechanical properties of the mixes were measured and were used to account for the validity of using these mixes in adhesion purposes. The static adhesion strength was measured using an H-shaped sample according to the ASTM D2138-83.