19 results on '"Pinto, José"'
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2. Discrimination of Chain Branching Models in Addition Diene Polymerizations
3. Mesoscopic Simulation of Dispersed Copolymers: Effects of Chain Length, Chemical Composition, and Block Length Distributions on Self‐Assembly
4. Copolymerization of Ethylene with 1,9-Decadiene: Part II-Prediction of Molecular Weight Distributions
5. Copolymerization of Ethylene with 1,9‐Decadiene: Part I – Prediction of Average Molecular Weights and Long‐Chain Branching Frequencies
6. Molecular Dynamic Simulation of Oxaliplatin Diffusion in Poly(lactic acid-co -glycolic acid). Part A: Parameterization and Validation of the Force-Field CVFF
7. Mathematical Modeling of Molecular Weight Distributions in Vinyl Chloride Suspension Polymerizations Performed with a Bifunctional Initiator through Probability Generating Functions
8. Mathematical Modeling of MWD and CBD in Polymerizations with Macromonomer Reincorporation and Chain Running
9. Matrix Representation of Polymer Chain Size Distributions, 3 – Case Studies for Linear Polymerization Mechanisms at Transient Conditions
10. Matrix Representation of Polymer Chain Size Distributions, 2
11. Deconvolution of Molecular Weight Distributions Using Dynamic Flory-Schulz Distributions
12. Analysis of Kinetic Models Proposed for the Controlled Degradation of Poly(propylene)– Presentation of a General and Analytical Solution
13. Evolution of Molecular Weight and Long Chain Branch Distributions in Olefin–Diene Copolymerization
14. Molecular-Weight Multimodality of Multiple Flory Distributions
15. Modeling Particle Size Distribution (PSD) in Emulsion Copolymerization Reactions in a Continuous Loop Reactor
16. A Matrix Representation of Polymer Chain Size Distributions, 1. Linear Polymerization Mechanisms at Steady-State Conditions
17. Computation of molecular weight distributions by polynomial approximation with complete adaptation procedures
18. Analysis of Kinetic Models Proposed for the Controlled Degradation of Poly(propylene) Presentation of a General and Analytical Solution
- Abstract
The objective of this work is to analyze kinetic models reported in the literature and used to describe the evolution of the molecular weight distribution during the controlled degradation of poly(propylene) in reactive extrusion processes. Although reported mathematical models are based on different kinetic mechanisms, a single set of differential equations can be written for all models if the degree of degradation is the independent variable, meaning that it is impossible to discriminate the proposed kinetic mechanisms based solely on molecular weight data. An original analytical solution is then developed for this set of equations, resulting in a simple recursive equation that depends only on one parameter the final degree of degradation. Simulations using this solution are carried out and comparisons are performed with an approximate solution proposed previously by Saito.
14 Simulation results for distinct degrees of degradation.
19. Evolution of Molecular Weight and Long Chain Branch Distributions in OlefinDiene Copolymerization
- Abstract
A model for olefindiene copolymerization and long chain branch formation was developed. The model shows that the number-average molecular weight and branching density increases linearly with time in a semi-batch polymerization, while the polydispersity depends on the diene content in the polymer and on the polymerization time. For low diene fractions or low polymerization times, the polydispersity increases linearly with time. For higher diene contents, the polydispersity increases exponentially with polymerization time after a critical polymer concentration is reached. The calculated distributions of branched species indicate that diene content influences the amount of highly branched chains produced in the polymerization, markedly broadening the distribution of molecular weight and leading to gel formation.
Weight distribution of branched species after 30 min of polymerization.
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