Abstract: The present disclosure describes methods of polyimide synthesis and polyimides made therefore. The method includes placing a tetracarboxylic compound and a solvent in a reaction vessel and adding a first amount of a diamine. The first amount of the diamine is not more than 99.5 mol % of the tetracarboxylic compound inside the reaction vessel. The method can include agitating the mixture and determining a viscosity of the mixture. The method can further include adding a second amount of the diamine. The last steps can be repeated until the viscosity increases to a target value. The target viscosity can be correlated to a peak weight-averaged molecular weight of the polyimide.

Abstract: The present disclosure describes methods of polyimide synthesis and polyimides made therefore. The method includes placing a tetracarboxylic compound and a solvent in a reaction vessel and adding a first amount of a diamine. The first amount of the diamine is not more than 99.5 mol % of the tetracarboxylic compound inside the reaction vessel. The method can include agitating the mixture and determining a viscosity of the mixture. The method can further include adding a second amount of the diamine. The last steps can be repeated until the viscosity increases to a target value. The target viscosity can be correlated to a peak weight-averaged molecular weight of the polyimide.

Abstract: The present application provides a functionalized filament for artificial turf, a method of manufacturing said filament and a field of artificial turf in which said filament is incorporated. The functionalized filament for artificial turf comprising polyolefin, such as polyethylene or polypropylene, and a compatibilizer that has a high affinity with polyurethane. The compatibilizers can be distributed in the filament uniformly or non-uniformly. The compatibilizer comprises a polyolefin polymer functionalized with various functional groups or their derivatives, such as amine, imide, hydroxyl, acid, anhydride, or acrylic.