Hyperbranched polymers from divinylbenzene and 1,3-diisopropenylbenzene through anionic self-condensing vinyl polymerization
Baskaran, D
| HERO ID | 1312205 |
|---|---|
| In Press | No |
| Year | 2003 |
| Title | Hyperbranched polymers from divinylbenzene and 1,3-diisopropenylbenzene through anionic self-condensing vinyl polymerization |
| Authors | Baskaran, D |
| Journal | Polymer |
| Volume | 44 |
| Issue | 8 |
| Page Numbers | 2213-2220 |
| Abstract | Hyperbranched polymers were synthesized using anionic self-condensing vinyl polymerization (ASCVP) by forming 'inimer' (initiator within a monomer) in situ from divinylbenzene (DVB) and 1,3-diisopropenylbenzene (DIPB) using anionic initiators in THF at -40 degreesC. The reaction of equimolar amounts of DVB and n BuLi results in the formation of hyperbranched poly(divinylbenzene) through self-condensing vinyl polymerization (SCVP). The hyperbranched polymers were invariably contaminated with small amount of gel (< 15%). No gelation was observed when using DIBP with anionic initiators. The presence of monomer-polymer equilibrium in the SCVP of DIPB restricts the growth of hyperbranched poly(DIPB). The inimer synthesized from DIPB at 35 degreesC undergoes intermolecular self-condensation to different extent depending on the nature of anionic initiator at -40 degreesC. The molecular weight of the hyperbranched polymers was higher when DPHLi was used as initiator. A small amount of styrene ([styrene]/[Li+] = 1) was used to promote the chain growth by inducing cross-over reaction with styrene, and subsequent reaction of styryl anion with isopropenyl groups of inimer/hyperbranched oligomer. The hyperbranched polymers were soluble in organic solvents and exhibited broad molecular weight distribution (2 < M-w/M-n < 17). (C) 2003 Elsevier Science Ltd. All rights reserved. |
| Doi | 10.1016/S0032-3861(03)00032-6 |
| Wosid | WOS:000181914600004 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science 000181914600004 |
| Is Public | Yes |
| Keyword | anionic polymerization; self-condensing vinyl polymerization; hyperbranched polymers |