| 主权项 |
1. A copolymer comprising:
5 to 95% monomer of formula I wherein
R is H or alkyl,‘d’ is 1-10,X may be present or absent, such that when X is present, X represents O, S or NR2, where R2 is H, (un)substituted or substituted alkyl, (un)substituted or substituted aryl, or CH2C6H5, andAr represents an aromatic ring which is (un)substituted or substituted with H, CH3, CF3, C2H5, alkyl, OCH3, C6H11, Cl, Br, C6H5, or CH2C6H5; 5 to 95% monomer of formula II wherein
R is H or alkyl,Y represents O or S,Ar represents an aromatic ring which is (un)substituted or substituted with H, CH3, CF3, C2H5, alkyl, OCH3, C6H11, Cl, Br, C6H5, or CH2C6H5; and 0.1 to 20% of a co-polymerizable cross linker selected from the group consisting of terminally ethylenically unsaturated compounds such as hexanediol dimethacrylate (HDDMA), Ethylene glycol dimethacrylate (EGDMA), allyl methacrylate, diallyl methacrylate; pentaerythritol tetra(meth)acrylate, 1,3-propanediol dimethacrylate, 1,4-butanediol dimethacrylate; and their corresponding acrylates. |
