Heterogeneous Polymerization of Hydrogels on Hydrophobic Substrate Export

@article{citeulike:4344004, abstract = {The substrate effect on the inhomogeneous gelation is in situ studied using various monomers: 2-acrylamide-2-methyl-1-propanesulfonic acid (AMPS), acrylic acid, and N,N`-dimethylacrylamide on various hydrophobic substrates with different surface tensions: poly(tetrafluoroethylene), polypropylene, polyethylene, polystyrene, and poly(vinyl chloride) in aqueous solution as well as in organic solvent by means of electronic speckle pattern interferometry. When the polymerization is carried out in water, a clear interface appears in the vicinity of the hydrophobic substrates at a critical time when the auto-acceleration of the polymerization starts. The polymerization on the hydrophobic substrate is suppressed after the appearance of the interface which gives rise to a heterogeneous gel structure. The thickness of the substrate-induced inhomogeneous layer increases with the square root of the polymerization time, showing the feature of monomer diffusion. An enhanced heterogeneous polymerization occurs on the hydrophobic substrate with a lower surface tension. These effects are greatly suppressed when the polymerization is carried out in ethanol and in the presence of hydrophobic monomer, giving rise to a homogeneous gelation. The correlation between the surface tension of the substrates and the interface strength in water suggests that the substrate-induced interface formation might be associated with the high interfacial tension between the substrate and the polymerizing solution.}, author = {Kii, Akishige and Xu, Jian and Gong, Jian P. and Osada, Yoshihito and Zhang, Xianmin}, citeulike-article-id = {4344004}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/jp003242u}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/jp003242u}, day = {1}, doi = {10.1021/jp003242u}, journal = {The Journal of Physical Chemistry B}, keywords = {pollen}, month = {May}, number = {20}, pages = {4565--4571}, posted-at = {2009-04-17 15:02:31}, priority = {2}, title = {Heterogeneous Polymerization of Hydrogels on Hydrophobic Substrate}, url = {http://dx.doi.org/10.1021/jp003242u}, volume = {105}, year = {2001} }

TY - JOUR ID - citeulike:4344004 L3 - citeulike-article-id:4344004 N2 - The substrate effect on the inhomogeneous gelation is in situ studied using various monomers: 2-acrylamide-2-methyl-1-propanesulfonic acid (AMPS), acrylic acid, and N,N`-dimethylacrylamide on various hydrophobic substrates with different surface tensions: poly(tetrafluoroethylene), polypropylene, polyethylene, polystyrene, and poly(vinyl chloride) in aqueous solution as well as in organic solvent by means of electronic speckle pattern interferometry. When the polymerization is carried out in water, a clear interface appears in the vicinity of the hydrophobic substrates at a critical time when the auto-acceleration of the polymerization starts. The polymerization on the hydrophobic substrate is suppressed after the appearance of the interface which gives rise to a heterogeneous gel structure. The thickness of the substrate-induced inhomogeneous layer increases with the square root of the polymerization time, showing the feature of monomer diffusion. An enhanced heterogeneous polymerization occurs on the hydrophobic substrate with a lower surface tension. These effects are greatly suppressed when the polymerization is carried out in ethanol and in the presence of hydrophobic monomer, giving rise to a homogeneous gelation. The correlation between the surface tension of the substrates and the interface strength in water suggests that the substrate-induced interface formation might be associated with the high interfacial tension between the substrate and the polymerizing solution. IS - 20 JF - The Journal of Physical Chemistry B EP - 4571 TI - Heterogeneous Polymerization of Hydrogels on Hydrophobic Substrate VL - 105 SP - 4565 KW - pollen AU - Kii, Akishige AU - Xu, Jian AU - Gong, Jian AU - Osada, Yoshihito AU - Zhang, Xianmin PY - 2001/05/01/ UR - http://dx.doi.org/10.1021/jp003242u ER -