| 학회 |
한국고분자학회 |
| 학술대회 |
2017년 가을 (10/11 ~ 10/13, 제주컨벤션센터) |
| 권호 |
42권 2호 |
| 발표분야 |
Celebration of the 50th Anniversary of Macromolecules(영어발표) |
| 제목 |
How to Map Phase Diagrams of Polymer Solutions - Microfluidics Marries Laser Light Scattering |
| 초록 |
Conventional mapping of a phase diagram of a polymer in a solvent requires a substantial amount of polymer (e.g., at least of the order of ~100 mg of narrowly distributed samples with different molar masses) and may take months or even years to reach the true two phase equilibrium at each given temperature, especially when the polymer concentration is high. This is why good phase diagrams of polymer solutions are rare in the literature. To solve such a problem, we developed a Teflon microfluidic device to prepare and store a series of droplets (~10 nL) at different polymer concentrations inside a glass capillary. The phase transition inside each polymer solution droplet sealed and isolated in immiscible fluorohydrocarbon could be quickly and precisely monitored by a newly developed small angle laser light scattering detector. Using poly(vinyl acetate) (PVAc) in isobutanol and in benzene as two examples, we demonstrated that a combination of micro-fluidic device and small angle light scattering enables us to map the phase diagram of a polymer in a given solvent within hours by using only a few mg of the sample because (1) each droplet contains no more than ~10 μg polymer and (2) the phase-transition induced interchain association inside each droplet can be quickly and sensitively detected. We have also shown that two sets of a total of eight precisely mapped phase diagrams of four PVAc fractions in the two solvents can be reasonably scaled together to form a master curve. |
| 저자 |
Chi Wu |
| 소속 |
The Chinese Univ. of Hong Kong/The Univ. of Science and Technology of China |
| 키워드 |
- |
| E-Mail |
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