Chapter 3 Free Radical Copolymerization
1 Chapter 3 Free Radical Copolymerization
1 Introduction
2 1 Introduction
1.1 Concept Homopolymerization polymerization of one kind of monomer Copolymerization(addition polymerization polymerization of more than one kind of monomer New kinds of copolymer can be synthesized by copolymerization of different combination of various monomers Copolymer generated from same monomers can have different compositions and topologies
• Homopolymerization —— polymerization of one kind of monomer; • Copolymerization (addition polymerization) —— polymerization of more than one kind of monomer; 1.1 Concept New kinds of copolymer can be synthesized by copolymerization of different combination of various monomers. Copolymer generated from same monomers can have different compositions and topologies
Examples Styrene PS Brittle, transparent, p nt, poor solvent toleration Styrene+ Acrylonitrile SAn High impact, good solvent toleration Styrene Butadiene sBr High elasticity Styrene Acrylonitrile-+ Butadiene ABS Engineering plastics Maleic anhydride No polymer Styrene maleic anhydride SMA
4 Examples Styrene Styrene + Acrylonitrile Styrene + Butadiene Styrene + Acrylonitrile+ Butadiene PS SAN SBR ABS Brittle, transparent, poor solvent toleration High impact, good solvent toleration High elasticity Engineering plastics Maleic anhydride Styrene + maleic anhydride No polymer SMA O O O
1.2 Type of copolymer - A-B-A-B-A-B-A-B-A-B-A-B-A-B-A-B-A-B A/ternating copolymer -A-A-A-A-A-A-A-A-B-B-B-B-B-B-B-B- Block copolymer also obtained by -A-A-B-A-B-B-A-A-A-B-A-B-B-B-B-A other methods 尺 andom copo/ymer A-A-A-A-A-A-A-A-A-A-A-A-A- A-A-A- ly prepare by other methods 中∞中 Grai copolyme
1.2 Type of copolymer also obtained by other methods Normally prepared by other methods