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Sensitivity analysis of single-phase isothermal free radical-induced grafting of polyethylene

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Abstract
Radical‐induced grafting of polyethylene involves many reactions such as initiator dissociation, hydrogen abstraction, graft chain initiation, graft (de)propagation, crosslinking, and homo(de)polymerization. To ensure a successful grafting, both the reaction rate and degree of grafting functionalization need to be sufficiently high, implying a design of the process conditions. In the present article, assuming isothermal conditions and a single‐phase reactive system, it is demonstrated that the grafting kinetics is influenced by the hydrogen abstraction rate coefficient, the depropagation equilibrium coefficient Keq , and the initial mass fractions of monomer, initiator, and polyolefin. It is shown that the reaction extent is a consequence of the interplay of the initial monomer mass fraction and Keq , and the average grafting length is determined by grafting “from” and “to,” with longer grafts being formed through grafting “to.” Close to equilibrium, the average graft length decreases and the crosslinking density increases provided that initiator is left. Moreover, the chain length distribution of the virgin polyolefin strongly influences the molecular arrangement of the grafting points along the polyolefin chains. This can be demonstrated from the hydrogen abstraction reaction event history of polyolefin chains.

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Chicago
Hernández Ortiz, Julio César, Paul Van Steenberge, Jan N. E. Duchateau, C. Toloza, F. Schreurs, Marie-Françoise Reyniers, Guy Marin, and Dagmar D’hooge. 2018. “Sensitivity Analysis of Single-phase Isothermal Free Radical-induced Grafting of Polyethylene.” Macromolecular Theory and Simulations 27 (6).
APA
Hernández Ortiz, J. C., Van Steenberge, P., Duchateau, J. N. E., Toloza, C., Schreurs, F., Reyniers, M.-F., Marin, G., et al. (2018). Sensitivity analysis of single-phase isothermal free radical-induced grafting of polyethylene. MACROMOLECULAR THEORY AND SIMULATIONS, 27(6).
Vancouver
1.
Hernández Ortiz JC, Van Steenberge P, Duchateau JNE, Toloza C, Schreurs F, Reyniers M-F, et al. Sensitivity analysis of single-phase isothermal free radical-induced grafting of polyethylene. MACROMOLECULAR THEORY AND SIMULATIONS. 2018;27(6).
MLA
Hernández Ortiz, Julio César et al. “Sensitivity Analysis of Single-phase Isothermal Free Radical-induced Grafting of Polyethylene.” MACROMOLECULAR THEORY AND SIMULATIONS 27.6 (2018): n. pag. Print.
@article{8573513,
  abstract     = {Radical\unmatched{2010}induced grafting of polyethylene involves many reactions such as initiator dissociation, hydrogen abstraction, graft chain initiation, graft (de)propagation, crosslinking, and homo(de)polymerization. To ensure a successful grafting, both the reaction rate and degree of grafting functionalization need to be sufficiently high, implying a design of the process conditions. In the present article, assuming isothermal conditions and a single\unmatched{2010}phase reactive system, it is demonstrated that the grafting kinetics is influenced by the hydrogen abstraction rate coefficient, the depropagation equilibrium coefficient Keq , and the initial mass fractions of monomer, initiator, and polyolefin. It is shown that the reaction extent is a consequence of the interplay of the initial monomer mass fraction and Keq , and the average grafting length is determined by grafting {\textquotedblleft}from{\textquotedblright} and {\textquotedblleft}to,{\textquotedblright} with longer grafts being formed through grafting {\textquotedblleft}to.{\textquotedblright} Close to equilibrium, the average graft length decreases and the crosslinking density increases provided that initiator is left. Moreover, the chain length distribution of the virgin polyolefin strongly influences the molecular arrangement of the grafting points along the polyolefin chains. This can be demonstrated from the hydrogen abstraction reaction event history of polyolefin chains.

},
  articleno    = {1800036},
  author       = {Hern{\'a}ndez Ortiz, Julio C{\'e}sar and Van Steenberge, Paul and Duchateau, Jan N. E. and Toloza, C. and Schreurs, F. and Reyniers, Marie-Fran\c{c}oise and Marin, Guy and D'hooge, Dagmar},
  issn         = {1022-1344 },
  journal      = {MACROMOLECULAR THEORY AND SIMULATIONS},
  language     = {eng},
  number       = {6},
  title        = {Sensitivity analysis of single-phase isothermal free radical-induced grafting of polyethylene},
  url          = {http://dx.doi.org/10.1002/mats.201800036},
  volume       = {27},
  year         = {2018},
}

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