- Trenton, New Jersey, United States
Robert Prud'homme
Princeton University, Chemical Engineering, Faculty Member
The basic equations for suspensions are written, assuming that the carrying fluid is isothermal and incompressible and that the particles occupy a negligible volume. The particles are assumed to be nondeformable, spherical, and of the... more
The basic equations for suspensions are written, assuming that the carrying fluid is isothermal and incompressible and that the particles occupy a negligible volume. The particles are assumed to be nondeformable, spherical, and of the same diameter. The velocity field of the particles and their trajectories are determined, and the evolution of the particle density is investigated. The results are
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Previosly noncontact surfaces of polystyrene (PS) and poly(2,6-dimethyl 1,4-phenylene oxide) (PPO) were self-bonded in a lap shear joint geometry below the glass transition temperature Tg The joints were then fractured in tension at room... more
Previosly noncontact surfaces of polystyrene (PS) and poly(2,6-dimethyl 1,4-phenylene oxide) (PPO) were self-bonded in a lap shear joint geometry below the glass transition temperature Tg The joints were then fractured in tension at room temperature and the contact area was analyzed by means of scanning electron microscopy. Zones of plastic deformation were revealed on the surfaces of PS and PPO
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... Studies of polyester/chlorinated poly(vinyl chloride) blends Georges Belorgey*, Madeleine Aubin and Robert E. Prud'homme Groupe de Recherche sur les Macromol~cules, D~partement de Chimie, Universit~ Lava ... DR Paul and S.... more
... Studies of polyester/chlorinated poly(vinyl chloride) blends Georges Belorgey*, Madeleine Aubin and Robert E. Prud'homme Groupe de Recherche sur les Macromol~cules, D~partement de Chimie, Universit~ Lava ... DR Paul and S. Newman), Academic Press, NY, 1978, Ch. ...
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The electrochemiluminescence (ECL) of Ru(bpy)32+ (bpy = 2,2'-bipyridine and its derivatives) complexes has attracted interest from chem- and bio-analytical researchers. Particularly, by labeling bio-molecules with Ru(bpy)32+... more
The electrochemiluminescence (ECL) of Ru(bpy)32+ (bpy = 2,2'-bipyridine and its derivatives) complexes has attracted interest from chem- and bio-analytical researchers. Particularly, by labeling bio-molecules with Ru(bpy)32+ derivatives, highly competitive ECL immunoassay and DNA probing have been employed in clinical and research laboratories and are now becoming standard methods. In the well-established commercial systems designed for bench-top applications, paramagnetic microbeads are
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... MJ PhD Thesis University of Pittsburgh, PA, USA, 1986 15 Lafrance, CP, P~zolet, M. andPrud'homme, RE Macromolecules 1991, 24, 4948 16 Lafrance, CP, Debigar6, J. and Prud'homme, REJ Polym. ... Phys. 1970, 41, 4284 23 Lovell,... more
... MJ PhD Thesis University of Pittsburgh, PA, USA, 1986 15 Lafrance, CP, P~zolet, M. andPrud'homme, RE Macromolecules 1991, 24, 4948 16 Lafrance, CP, Debigar6, J. and Prud'homme, REJ Polym. ... Phys. 1970, 41, 4284 23 Lovell, R. and Mitchell, GR Acta Crystallogr. ...
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ABSTRACT Polarized Fourier transform infrared (FTIR) spectroscopy has been used extensively to study polymer orientation. The dichroic ratio and the dichroic difference are normally obtained from spectra recorded sequentially with the... more
ABSTRACT Polarized Fourier transform infrared (FTIR) spectroscopy has been used extensively to study polymer orientation. The dichroic ratio and the dichroic difference are normally obtained from spectra recorded sequentially with the infrared radiation polarized parallel and perpendicular to a reference direction. To improve the sensitivity of this technique and to be able to follow accurately the dynamics of orientation, FTIR spectroscopy has been coupled with the polarization modulation (PM) technique. With this technique, the dichroic difference spectrum is recorded directly, thus minimizing instrumental and sample fluctuations. The results obtained demonstrate the high efficiency of polarization modulation infrared linear dichroism (PM-IRLD) to determine quantitatively the time dependence of the orientation function of several chemical groups during the orientation and relaxation processes. Examples of the application of this technique to study in situ the dynamics of orientation will be presented for both stretched films of polystyrene (PS) and poly(vinyl methyl ether) (PVME) blends and optically oriented copolymers containing azobenzene side chains. The use of the PM-IRLD technique has allowed the direct determination of the relaxation kinetics of the components in polymer blends. In the case of the azopolymers, the time-dependent spectra obtained by PM-IRLD have also been analyzed by two-dimensional Fourier transform infrared (2D-FTIR) spectroscopy. The results obtained with this technique show that the spectral resolution is significantly enhanced in the asynchronous maps that also provide valuable information about the relative movement of the different chemical groups of the polymers.
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Fourier transform infrared dichroism was used to determine the angle a between the CN transition moment and the chain axis, at 2238 cm-1, of SAN copolymers containing from 9 to 38 % AN units. This angle was found to be 90°.
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ABSTRACT
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Summary The α-relaxations, located in the neighborhood of glass-transition region (Tg), of a styrene-co-4-vinylbenzoic acid (PSVBA) random copolymer blended in several weight proportions with an ethyl methacrylate-co-4-vinylpyridine... more
Summary The α-relaxations, located in the neighborhood of glass-transition region (Tg), of a styrene-co-4-vinylbenzoic acid (PSVBA) random copolymer blended in several weight proportions with an ethyl methacrylate-co-4-vinylpyridine (PEMAVP) random copolymer have been investigated by dielectric spectroscopy in the temperature and frequency ranging from 25 to 180 °C and 0.1 to 100 kHz, respectively. The analysis of the obtained results shows
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The influence of minute amounts of residual tetrahydrofuran on the crystallization of ultrathin poly(ε-caprolactone) (PCL) films has been investigated in real-time by atomic force microscopy. Crystallizations were performed at 30°C, after... more
The influence of minute amounts of residual tetrahydrofuran on the crystallization of ultrathin poly(ε-caprolactone) (PCL) films has been investigated in real-time by atomic force microscopy. Crystallizations were performed at 30°C, after melting at 64°C, for different periods of time; both the morphology and growth rate of the crystals were found to depend on the thermal history of the sample, i.e. on the heating time, due to the evaporation of the residual solvent trapped in the spin-coated polymer. The residual solvent, acting as a plasticizer, facilitates the diffusion of the polymer chains to the crystal growth front; its elimination slows down the growth rates and leads to a decrease of the width of the dendrites. Growth rates were measured for the edge-on and for the flat-on lamellae, which are nucleated from them. Edge-on lamellae were found to crystallize 15 times faster than flat-on lamellae. Finally, spinodal dewetting was observed in the melt left between dendrites grown at 30°C, after evaporation of the residual solvent, on a substrate of lower wettability. These observations are discussed in terms of the mobility of polymer chains in the melt.
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... 1987, 28, 804 13 Aubin, M., B6dard, Y., Morissette, MF and Prud'homme, REJ Polym. Sci., Polym. Phys. Edn 1983, 21,233 14 Cousin+ P. and Prud'homme, RE Eur. Polym. J. 1982, 18,957 15 Aubin, M. and Prud'homme,... more
... 1987, 28, 804 13 Aubin, M., B6dard, Y., Morissette, MF and Prud'homme, REJ Polym. Sci., Polym. Phys. Edn 1983, 21,233 14 Cousin+ P. and Prud'homme, RE Eur. Polym. J. 1982, 18,957 15 Aubin, M. and Prud'homme, RE Polym. Eng. Sei. 1984, 24, 35O 16 Gordon, M. and ...
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ABSTRACT N,N′-Di(S-phenylethyl)-2-amino-4-iminopent-2-ene, S,S-nacnacCH(Me)PhH, 1a, and N,N′-dibenzyl-2-amino-4-iminopent-2-ene, nacnacBnH, 1b, react with ZnEt2 to form the corresponding nacnacZnEt complexes 2a and 2b. Neither complex is... more
ABSTRACT N,N′-Di(S-phenylethyl)-2-amino-4-iminopent-2-ene, S,S-nacnacCH(Me)PhH, 1a, and N,N′-dibenzyl-2-amino-4-iminopent-2-ene, nacnacBnH, 1b, react with ZnEt2 to form the corresponding nacnacZnEt complexes 2a and 2b. Neither complex is reactive with 2-propanol or methyl lactate to produce the corresponding alkoxide complexes. In reactions with 2b, ligand redistribution occurs and nacnacBn2Zn was obtained. Reaction of 1a and 1b with Zn(N(SiMe3)2)2 yielded nacnacZnN(SiMe3)2, 6a and 6b. From further reactions with 2-propanol nacnacZnOiPr, 7a and 7b, were obtained. Both complexes were catalytically active for polymerization of rac-lactide with apparent first-order rate constants of kapp = 0.013−0.019 min−1 and 0.019−0.038 min−1 for 7a and 7b, respectively. Obtained polymers were highly heterotactic, with Pr = 0.84−0.87 (7a) and 0.65−0.71 (7b). Analysis of remaining monomer after 75% conversion showed negligible ee and indicates that chiral 7a does not show enantioselectivity in rac-lactide polymerization. Complex 7a, but not 7b, catalyzes unselective transesterification of the polymer during and after polymerization. PLA microstructures in polymerizations with 7b were independent of temperature (23 or 0 °C) or monomer/catalyst ratio (100:1 to 400:1). However, slightly higher Pr values were obtained in the presence of 10−100 equiv of MeCN or pyridine. Complexes nacnacBn2Zn, 2b, 6b, and 7a were characterized by an X-ray diffraction study.
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... Orientation in Polymer Blends Paul Chabot, Michel P6zolet*, and Robert E. Prud'homme ... These results are consistent with those obtained by Theodorou and Jasse [3] who observed the same behavior for PVC plasticized with low... more
... Orientation in Polymer Blends Paul Chabot, Michel P6zolet*, and Robert E. Prud'homme ... These results are consistent with those obtained by Theodorou and Jasse [3] who observed the same behavior for PVC plasticized with low molecular weight plasticizers. Fig. ...
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... 6) Xu, J.; Guo, B.; Zhang, Z.; Zhou, J.; Jiang, Y.; Yan, S.; Li, L.; Wu, Q.; Chen, G.; Schultz, JM Macromolecules2004, 37, 4118−4123. ... 19) Xu, J.; Guo, B.; Zhou, J.; Li, L.; Wu, J.; Kowalczuk, M. Polymer2005, 46, 9176−9185. ...
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... Claude-Paul Lafrance, Michel Pbzolet, and Robert E. Prud'homme. ... The (P,JC coefficients corresponding to the orientation distribution of the mo-lecular chains were also calculated from these different reflections using a... more
... Claude-Paul Lafrance, Michel Pbzolet, and Robert E. Prud'homme. ... The (P,JC coefficients corresponding to the orientation distribution of the mo-lecular chains were also calculated from these different reflections using a relationship suggested by Love11 and Mitchell.16 The ...
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... Madeleine Aubin and Robert E. Prud'homme". Groupe de Recherche sur les MacromolGcules, DZpartement de Chimie, Uniuersitd Laual, QuZbec PQ, Canada GlK 7P4. ... An alternative method, originally derived by Fineman and... more
... Madeleine Aubin and Robert E. Prud'homme". Groupe de Recherche sur les MacromolGcules, DZpartement de Chimie, Uniuersitd Laual, QuZbec PQ, Canada GlK 7P4. ... An alternative method, originally derived by Fineman and ROSS?' consists in plotting Y vs. ...
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... For example, Ola-bisi2 has concluded that the PCL/poly(vinyl chloride) (PVC) blends are a result of the proton donating character of the a-hydrogens of PVC combined with the proton accepting character of the carbonyl groups of PCL.... more
... For example, Ola-bisi2 has concluded that the PCL/poly(vinyl chloride) (PVC) blends are a result of the proton donating character of the a-hydrogens of PVC combined with the proton accepting character of the carbonyl groups of PCL. ... (38) YJ Shur and BG Ranby, J. Appl. ...