Determination of polymer molecular weight

소개글

"Determination of polymer molecular weight"에 대한 내용입니다.

목차

Ⅰ. Purpose
Ⅱ. Background information
Ⅲ. Materials
Ⅳ. Procedure
Ⅴ. Obesrvation and Data (Assignment)
Ⅵ. Conclusion(Summary)

본문내용

Ⅰ. Purpose
To understand the relationship between viscosity and molecular weight & effect of viscosity

Ⅱ. Background information
A. Viscosity
It means the resistance of fluid to deformation under shear stress. There are several viscometers that measure the rate at which a liquid flows. The flow rate, R can be expressed by Poiseuille’s Law

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Ⅳ. Procedure
A. Preparation of polyvinyl alcohol/water solution
Notes
1) A few days before the experiment, a solution of different weight percent should be prepared.
2) Dissolve dry polyvinyl alcohol in 90°C water.
3) Be careful not to create bubbles or foam.
4) Cool the solution and transfer to another vial.
5) Put a label on the polymer solution and store it in the refrigerator.

B. Measuring the time taken
1) Pour 10 mL of distilled water into the viscometer using a pipette.
2) Suck the water from the bottom marked area to the top.

참고 자료

한국표준협회, KSA 0531 액체의 점도-측정방법 https://e-ks.kr/streamdocs/view/sd;streamdocsId=72059216659265131
The Royal Society of Chemistry (2012), Electronic Supplementary Material (ESL) for RSC advances http://www.rsc.org/suppdata/ra/c2/c2ra20916k/c2ra20916k.pdf
Wikipedia contributors. (2021, July 23). Polyvinyl alcohol. Wikipedia. https://en.wikipedia.org/wiki/Polyvinyl_alcohol (Retrieved October 4, 2021)