Monofunctional alcohols will combine with a
difunctional epoxy to create a linear polymer.
Different reaction kinetics is related to different functionalities of the reagents (DDM is tetrafunctional and PA is
difunctional), which results in a higher cross-link density and a more rigid network cured with DDM.
(2003) who have used 1,4-butanediol as
difunctional chain extender which results into increase in density and compressive strength.
In our initial screening, we used
difunctional urethane acrylate oligomers (UA) to mimic the softer polyol regions in the traditional two-part systems and trifunctional acrylate crosslinkers (M) for the harder isocyanate regions.
Hayashi, Synthesis of Novel UV-Curable
Difunctional Thirteen Methacrylate Plastic Lenses, Prog.
Pluronic[R]F-68 (polyoxyethylene-polyoxypropylene block copolymer; a relatively nontoxic
difunctional surfactant) and poly(ethylene glycol)methyl methacrylate can be grafted to poly(dimethyl siloxane) surfaces to improve their wettability and to reduce bacterial adhesion.
Suitable polyols for use in the present invention include
difunctional and trifunctional alcohols, and the acids include aliphatic and aromatic polycarboxylic acids and their esters.
These are multifunctional or linear
difunctional silicone prepolymers with reactive terminal end groups that allow modification of coating performance through incorporation of silicone moieties into coating resins and binders.
Terminologies such as tailored bimodal or controlled long-chain branching discuss the addition of
difunctional diene monomers such as vinylnorbomene or hexadiene comonomers that essentially couple the polymer chains to form an H-branched structure.