What is the viscosity of polystyrene?
What is the viscosity of polystyrene?
The viscosity of solutions of polystyrene of various molecular weights (from 1.04 · 102 to 3.8 · 105) in a poor solvent (decalin) and a good solvent (ethylbenzene) has been measured at temperatures from 15 to 70°C over a broad range of shear stresses from 102 to 106 dyne/cm2.
What is viscosity average molar mass?
In this method viscosity of liquid is measured by comparing the flow times of two liquids of equal volumes using same viscometer. The molecular weight of the polymer is measured by using viscometer and the molecular weight obtained by this technique is called viscosity average molecular weight.
What is the average molecular weight of polystyrene?
Polystyrene average Mw ~350,000, average Mn ~170,000 | 9003-53-6.
Does viscosity depend on molecular weight?
A High molecular weight increases the impact resistance of the material. A High molecular weight increases the viscosity of the material – makes it harder to process the material using conventional methods.
What is a polystyrene cup?
White expanded polystyrene (styroweave) drink cups are an economical approach to storing and transporting both hot and cold liquids such as tea, coffee, hot chocolate or even cereal.
How do you find the molar mass of polystyrene?
So, finally, Molecular mass of polystyrene=2.05⋅g0.0278⋅mol⋅L−1×10.100⋅L=737⋅g⋅mol−1 .
How is viscosity of polystyrene solution measured?
A measurement with an Ubbelohde capillary viscometer yields following results: Pure benzene: 100 sec. Polystyrene solution: 160 sec. The viscosity is given by ηrel= η/ ηS= 160 / 100 = 1.6 ηsp= ηrel- 1 = 0.6 ηred= ηsp/ c= 0.6 / 0.001 g/ml = 600 ml/g
Why is the viscosity of a polymer solution high?
The molecular weight of the polymer solution is very high so the viscosity of polymer solution is very high compared to that of pure solvent. From the Mark-Houwink equation the relationship among the molecular weight and viscosity are given below
How big is the melting point of polystyrene?
Polystyrene: Molecular Weight/ Molar Mass: 104.1 g/mol: Density: 1.04 g/cm³: Solubility in water: Insoluble: Melting Point: Approx 240 °C
How is the viscosity of a molar mass determined?
M is the molar mass, [ η] is the intrinsic viscosity or limiting viscosity number. This is obtained by plotting ( η – η0 )/ η0c against concentration c and noting its extrapolated value at infinite dilution. In this case, η is the viscosity of the polymer solution and η0 the viscosity of the pure solvent.