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FIZIKA A 17 (2008) 2 , 77-86
 
SUITABLE SOLVENT OF A NEW COPOLYMER AS A PRE-INVESTIGATION OF ITS STATIC LASER SCATTERING
R. GHAZY
Laser Laboratory, Physics Department, Faculty of Sciences, Tanta University, Tanta, Egypt
E-mail address: riyadghazy@yahoo.com
Received 27 December 2007; Revised manuscript received 17 October 2008
Accepted 22 October 2008 Online 28 January 2009
An interferometric method, Mach-Zehnder interferometer, is applied to
determine both refractive index and refractive index increments (dn/dc)
for a new copolymer material poly-(4-vinylphenol-co-2-hydroxethyl methacrylate),
PVPh-HEM, in different solvents like methanol and dimethylformamide. The PVPh-HEM
is solved in each solvent with different concentrations ranging from 0.004 to
0.010 g/ml. The light source we have used is the argon-ion laser with the
wavelength of 488 nm. This work is carried out as a step for the determination
of the average molecular weight of PVPh-HEM and its other related scattering
parameters.
PACS numbers: 78.20.Ci, 36.20.-r
UDC 532.77, 535.324
Keywords: poly-(4-vinylphenol-co-2-hydroxethyl methacrylate), refractive index,
average molecular weight
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