Plate Removal Schedule

Workshop series 2013SJU-AAPS Student ChapterSt. Johns UniversityOct. 10 2013, 5:00 PMTapan ParikhSt. Johns University, Queens, New YorkE-mail: tapan.parikh05@stjohns.edu; 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 ?