Measurement of Viscosity of Triblock Copolymer by Capillary Viscometer (CAT#: STEM-PPA-0010-YJL)

Introduction

ABA triblock copolymers with H-bonding endsegments have interesting properties. Triblock copolymers have been studied with uridopyrimidinone, urethane, and amide end-groups. If the structure is regular, the H-bonding end-segments can crystallize and as the end-segments are more mobile, they crystallize faster and have a higher crystallinity than mid-segments. If the end-segments were made with a regular structure and mono-disperse in length, the crystallinity was very high, near 100%. These triblock copolymers had a relatively high modulus and relative high elongations at break.

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Principle Applications Procedure Materials Notes Related Products

Principle

A capillary viscometer is an instrument used to measure the viscosity, or thickness, of a liquid by measuring how long it takes the liquid to flow through a small-diameter tube, or capillary. The flow, or efflux, time is directly proportional to the liquid's kinematic viscosity, and may be converted directly to viscosity by use of a conversion factor unique to each instrument. Viscosity is generally temperature dependent, so the capillary viscometer is usually used in a controlled-temperature water bath set to a specific temperature.
The capillary method is used to determine the viscosity of a Newtonian fluid (a liquid with a viscosity independent of the shearing stress or rate of shear). Capillary viscometer calculations are performed using suspended level capillary viscometers and Ostwald-type capillary viscometers.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry

Procedure

1. Select the capillary viscometer and load the sample.
2. Adjust the bath temperature.
3. Determine the efflux time of the sample.

Materials

• Sample Type: Newtonian fluid

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