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656 Newest Publications in macromolecular symposia
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Gamma‐Irradiation to Modify Properties in Polypyrroles Synthesized by Plasmas
15-04-2013 | Osvaldo G. Lopez, Guillermo J. Cruz, Ma. Guadalupe Olayo, Lidia Ma. Gomez, Maribel Gonzalez‐Torres, Rosa Ma. Gomez, ..., Macromolecular Symposia, 2013
Abstract This work presents a study about the effect of gamma irradiation in plasma polymers derived from pyrrole. Gamma rays modify the whole energetic equilibrium between the nucleus and the electron clouds which results in rearrangements of atoms, molecules and in modifications in the ...
Aromatic Polyamides Density from Molecular Dynamics Simulation
15-04-2013 | José Luis Santiago García, María Isabel Loría Bastarrachea, Manuel de Jesús Aguilar Vega, Macromolecular Symposia, 2013
Abstract Molecular dynamics simulations have been performed on seven aromatic polyamides to understand the structure‐property relationships on their densities. The aromatic polyamides studied in this work are based on poly(hexafluoroisopropylidene) isophthalamide, HFAISO. The aim of this ...
The Ring‐Opening Polymerization of ε‐Caprolactone Catalyzed by Molybdenum Trioxide: A Kinetic Approach Study Using NMR and DSC Data
15-04-2013 | Simón Yobanny Reyes‐López, Antonio Martinez Richa, Macromolecular Symposia, 2013
Abstract The bulk ring‐opening polymerization (ROP) of ε‐caprolactone (CL), catalyzed by molybdenum trioxide (α‐MoO3), was investigated under nitrogen atmosphere at 150°C. Effect of monomer/initiator ([CL]0/[I]0, I = MoO3) and monomer/initiator/co‐initiator ([CL]0/[I]0/[CoI]0, CoI = ROH ...
Kinetic Modeling of 1,3‐Diene Polymerization Using a Neodymium‐Based Catalytic System: A New Approach for Calculating the Molecular Weight Distribution
15-04-2013 | Jorge Herrera‐Ordonez, Ramón Diaz‐de Leon, Yair A. de Santiago‐Rodriguez, Macromolecular Symposia, 2013
Abstract Summary: A new lumping‐based approach for calculating the molecular weight distribution (MWD) in polymerization systems is proposed. In order to illustrate its applicability the proposed methodology is used for modelling the kinetics of a 1,3‐diene polymerization using a binary ...
Interaction of Plasma Polypyrrole Particles with Ionic Solutions
15-04-2013 | Lidia Ma. Gómez, Ma. Guadalupe Olayo, Guillermo J. Cruz, Maribel González‐Torres, Osvaldo G. López, Carlos De Jesús, Macromolecular Symposia, 2013
Abstract This work presents a study about the hydrophilicity and conductivity of plasma polypyrroles (PPy) in contact with solutions of salt concentration similar to human tissues. PPy is a conjugated biocompatible polymer in which the electronic distribution produces partial relocation ...
Synthesis and Characterization of Ionic Graphene Oxides (GO) for the Generation of New Multilayered Structures and Hybrid GO/Polymer Nanocomposites
15-04-2013 | Raquel Ledezma, Layza Arizmendi, J. Alberto Rodríguez, Adali Castañeda, Ronald F. Ziolo, Macromolecular Symposia, 2013
Abstract The chemical surface modification of graphene and graphene oxide materials is a burgeoning area of investigation. We report the preparation of new ionic forms of graphene oxide by wet chemical modification and metathesis reactions. Graphene oxide (GO) was prepared by a modified ...
A Note on the Elasticity of Polymer Melts Described by Primary Normal Stress Difference (N1)
15-04-2013 | César A. García‐Franco, Macromolecular Symposia, 2013
Abstract A method is proposed to characterize the elastic behavior of polyolefin melts, by calculating the first normal stress difference, N1 as a function of shear rate. The method is predicated on Cogswell's abrupt contraction flow analysis.1 These results are compared with experimental ...
Anionic Synthesis of α‐Functionalized Polymers by Combination of 1,1‐Diphenylethylene and Hydrosilation Chemistry
15-04-2013 | Roderic P. Quirk, Sujata Sahoo, Macromolecular Symposia, 2013
Abstract A new general anionic functionalization method (GFM) for preparing α‐chain‐end functionalized polymers utilizes the initiator formed from sec‐butyllithium and dimethyl[4‐(1‐phenylvinyl)‐phenyl]silane (DPESiH) followed by hydrosilation with substituted alkenes. α‐(4‐dimethylsilyl ...
TEMPO Mediated Radical Emulsion Polymerization of Styrene by Stepwise and Semibatch Processes
15-04-2013 | Roberto González‐Blanco, Enrique Saldívar‐Guerra, Jorge Herrera‐Ordóñez, Andrés Cano‐Valdez, Macromolecular Symposia, 2013
Abstract In the present study we carried out nitroxide mediated radical polymerizations (NMRP) of styrene in emulsion using 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) by stepwise and semibatch processes obtaining polystyrene (PS) with a dispersity (Đ) lower than 1.5 and average particle ...
Synthesis and Characterization of High Impact Polystyrene from a Heterogeneous Styrene‐Rubber‐Polystyrene Solution: Influence of PS Concentration on the Phase Inversion, Morphology and Impact Strength
15-04-2013 | Florentino Soriano‐Corral, Graciela Morales, Pablo Acuña, Enrique Díaz‐Barriga, Berenice Arellano, Claribel Vargas, ..., Macromolecular Symposia, 2013
Abstract High Impact Polystyrene (HIPS) was synthesized by free radical polymerization through the bulk‐bulk technique. Polybutadiene (PB) and/or poly(butadiene‐b‐styrene) copolymer (S:B = 30:70) (at 8 wt‐%) were used as impact modifiers in the presence of 0, 5 and 7.5 wt‐% of polystyrene ...
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