The intrinsic viscosity [η] of poly(3,5-dimethyl-phenyl-acrylate) (35PDMPA) solutions were evaluated throughout the measurements of the flow times of toluene and polymer solutions by classical Huggins, and Kraemer's methods using a Cannon-Ubbelohde semi-micro-dilution capillary viscometer in a Cannon thermostated water bath at 40˚C ± 0.02˚C. The values of Huggins' constant estimated ranged from 0.2 to 0.4 which were within expectations. The intrinsic viscosities and molecular weight relationship was established with the two-parameter classical models of Staudinger-Mark-HouwinkSakurada and Stockmayer-Fixman. Conformational parameter C ∞ and σ indicated 35PDMPA be semi flexible. Also, the rigidity of 35PDMPA was confirmed by Yamakawa-Fuji wormlike theory modified by Bohdanecký. The molecular parameters were estimated and compared. The results showed that 35PDMPA behaves like a semi-rigid polymer in toluene at 40˚C rather than a random coil flexible macromolecule.
with joint appointments to Mathematical Sciences and Education & Human Development. Her research interests include student cognition in mathematics, development of teacher identity among graduate teaching assistants, curricular reform to foster diversity and inclusion in STEM fields, and development of mathematical knowledge for teaching.
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