BLOCK GRAFT COPOLYMERS

BLOCK & GRAFT COPOLYMERSCao học Hóa Lý Tổng hợp & Biến tính polymer Hà Thúc Huy... General Synthetic Strategies AB diblock copolymers: • a sequential addition of monomers • b coupling of

BLOCK & GRAFT COPOLYMERS

Cao học Hóa Lý Tổng hợp & Biến tính polymer

Hà Thúc Huy

General Synthetic Strategies

AB diblock copolymers:

• (a) sequential addition of monomers

• (b) coupling of two appropriately

end-functionalized chains.

ABA triblock copolymers :

(a) three-step sequential addition of monomers

(b) two-step sequential addition of monomers followed by a coupling reaction with a suitable difunctional linking agent

(c) use of a difunctional initiator and a two-step sequential addition of monomers.

Synthesis of Block Copolymers by

Anionic Polymerization

The less reactive monomer should

6

EX : P2VP-b-PEO-b-P2VP

EX : PS –b-PDMS-b-PS

Vavasour JD, Whitmore MD (1996) Macromolecules 29:5244

EX : PS-b-PCHD

1,3-Cyclohexadiene  CHD

Ko MJ, Kim SH, Jo WH (2001) Macromol Theory Simul 10:381

Synthesis of Block Copolymers by

Atom Transfer Radical Polymerization, ATRP

propionate)benzene2-bromo-2-methylpropionic acid 4-

1,4-(2’-bromo-2’-methyl-methoxyphenyl ester

Synthesis of Block Copolymers

by Combinations of Different Polymerization Techniques

EX : PTHF-b-PS-b-PTHF

EX : PLLA-b-PS-b-PMMA

Buzza DMA, et al (2000) Macromolecules 33:8399

EX : PEO-b-PS

ROP + TEMPO

Choi S, Vaidya NY, Han CD, Sota N, Hashimoto T

Synthesis of Non-Linear Block

Copolymers

a Use of multifunctional initiators:

b Use of multifunctional linking agents:

c Use of difunctional monomers:

poly[4-(2-hydroxyethyl)caprolactone]}4

{polycaprolactone-b-Krishnamoorti R, Modi MA, Tse

MF, Wang H-C (2000) Macromolecules 33:3810

(PEO-b-PS)n, n = 3, 4 star-block copolymers

26

28

EX : Grafting - onto

(

O- K+ 10-undecene-1-ol

ω -undecenyl, α− hydroxy PEO

34

Emulsion Polymerization

PEO