Polyacrylate-polysilane block copolymers
The invention relates a polyacrylate-polysilane block copolymer of general structure (I): wherein m and n independent of one another, are integers ranging from 2 to 4000; p is an integer ranging from 0 to 5; q is an integer ranging from 1 to 5; R 1 represents hydrogen, straight-chain or branched alkyl group having 1 to 4 carbon atoms; R 2 represents hydrogen, straight-chain or branched alkyl group having 1 to 18 carbon atoms; R3 represents hydrogen, hydroxyl group, straight-chain or branched alkyl group having 1 to 4 carbon atoms, or an C 6 -C 14 aryl group; L is a linking moiety representing amine (—NH—) group, amide (—C(O)NH—) group, urea (—NHC(O)NH—) group, urethane (—OC(O)NH—) group or methylene (—CH 2 —) group; R 4 , R 5 and R 6 independent of one another, represents hydrogen, straight-chain or branched, alkyl group having 1 to 8 carbon atoms or polydimethylsiloxane group; and R 7 represents hydrogen or methyl group.
1. A polyacrylate-silane polymer block copolymer of general structure (I):
wherein
m and n independent of one another, are integers ranging from 2 to 4000;
p is an integer ranging from 0 to 5;
q is an integer ranging from 1 to 5;
R 1 represents hydrogen, straight-chain or branched alkyl group having 1 to 4 carbon atoms;
R 2 represents hydrogen, straight-chain or branched alkyl group having 1 to 18 carbon atoms;
R 3 represents hydrogen, hydroxyl group, straight-chain or branched alkyl group having 1 to 4 carbon atoms, or an C 6 -C 14 -aryl group;
L is a single bond or a bivalent group —NH—, —C(O)NH—, —NHC(O)NH—, —OC(O)NH— or —CH 2 —;
R 4 , R 5 and R 6 independent of one another, represent hydrogen, straight-chain or branched alkyl group having 1 to 8 carbon atoms or a polydimethylsiloxane residue; and
R 7 represents hydrogen or methyl group, and
wherein at least one of R 4 , R 5 and R 6 represents a polydimethylsiloxane group.
2. The block copolymer as claimed in claim 1 , wherein m is an integer ranging from 100 to 1000.
3. The block copolymer as claimed in claim 1 , wherein n is an integer ranging from 100 to 1000.
4. The block copolymer as claimed in claim 1 , wherein p is an integer ranging from 0 to 3.
5. The block copolymer as claimed in claim 1 , wherein q is an integer ranging from 1 to 3.
6. The block copolymer as claimed in claim 1 , wherein the weight ratio of the polyacrylate block (A) to the silane polymer block (B) is in the range of about 1:1.8×10 7 to 6204:1.
7. The block copolymer as claimed in claim 1 , wherein the number average molecular weight of the polydimethylsiloxane group is in the range of about 500 g/mole to about 300,000 g/mole.
8. The block copolymer as claimed in claim 1 , wherein the weight ratio of the polydimethylsiloxane group to the total weight of the polyacrylate-polysilane block copolymer of general structure (I) is in the range of 1:2.8 to 1:24023.
9. The block copolymer as claimed in claim 1 , wherein R 1 represents hydrogen, methyl or ethyl.
10. The block copolymer as claimed in claim 1 , wherein R 2 represents hydrogen, methyl or ethyl.
11. The block copolymer as claimed in claim 1 , wherein R 3 represents hydrogen.
12. A method for preparing a polyacrylate-silane polymer block copolymer as claimed in claim 1 , comprising the step of polymerizing an acrylate polymer of formula “block (A)” and a silane polymer of formula “block (B)” at a reaction temperature of at most 120° C.
13. A polymer blend comprising the block copolymer as claimed in claim 1 to enhance scratch-resistance of polymers.