Workshop series 2013 SJU-AAPS Student Chapter St. John’s University Oct. 10 2013, 5:00 PM
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Transcript of Workshop series 2013 SJU-AAPS Student Chapter St. John’s University Oct. 10 2013, 5:00 PM
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Workshop series 2013SJU-AAPS Student ChapterSt. Johns UniversityOct. 10 2013, 5:00 PMTapan ParikhSt. Johns University, Queens, New YorkE-mail: [email protected]; Phone: 718-990-8087Rheometer1ReferencesWebinar Presentation: Viscoelasticity- Creep and Oscillatory Rheology. Plog, J,11th July 2013. (Thermo Scientific website)
Rotational Rheometery. Brno, 28- 29th march 2012- school of rheology.www.malvern.com (Malvern Instruments website)
Rheometer. www.tainstruments.com (TA Instruments website)
Viscoelastic properties of polymers. Ferry, J. John Wiley & Sons, 3rd edition
12RheologyStudy of flow of matter in liquid state as well as soften solid state in which material responds as a plastic rather than deforming elastically in response to applied force. *
Viscosity (measure of resistance to deformation)Elasticity (tendency of solid material to return to original shape after deformation)
Rheometer
*Schowalter (1978) Mechanics of non-newtonian fluid pergamon23Types of rheometerShear stress/ shear strain basedCapillary rheometerRotational cylinderCone and plate (homogenous sample) Plate and plate (heterogeneous sample)
Extensional stress basede.g. Rheoten (fiber spinning) Capillary break
3Typical shear rate ranges
4Instrumental: Rheometer
Lower PlateUpper Plate
Environmental test chamber5Discovery Hybrid HR2 Rheometer6Working Principle
Strain Shear stressShear Viscosity (Pa. S)= Shear stress / Shear rate = (G*) (Time) 67
Principle of oscillatory measurement
7Step 1. Amplitude sweep
8Step 2. Frequency sweep
9Step 3. Oscillatory measurement
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11Rheological profiles of copolymers
Tan()109CTan()123CSOLUPLUSKOLLIDON VA 64
15ApplicationsMelt extrusionStrength of gelDie swellTime dependent properties, e.g. coating16Questions ?