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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Combinación de polietileno y polipropileno: mejora del rendimiento con polímeros de varios bloques PE/PP

James M Eagan1, Jun Xu2, Rocco Di Girolamo1

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)
|February 25, 2017
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Los investigadores desarrollaron copolímeros de polietileno/polipropileno isotáctico para mezclar plásticos inmiscibles. Estos nuevos copolímeros permiten la soldadura de grados comunes de polietileno e isotáctico de polipropileno, mejorando la reciclabilidad y la resistencia del material.

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Área de la Ciencia:

  • Ciencia de los Polímeros
  • Ciencias de los materiales
  • Ingeniería Química

Sus antecedentes:

  • El polietileno (PE) y el polipropileno isotáctico (iPP) son plásticos ampliamente utilizados, pero son inmiscibles.
  • Esta inmiscibilidad plantea desafíos significativos para el reciclaje y la creación de materiales compuestos avanzados.
  • El desarrollo de estrategias efectivas de compatibilización es crucial para mejorar la utilidad de estos polímeros abundantes.

Objetivo del estudio:

  • Para sintetizar nuevos copolímeros PE/iPP de varios bloques.
  • Investigar la capacidad de estos copolímeros para compatibilizar y mezclar PE e iPP inmiscibles.
  • Explorar el potencial de mejora de las propiedades mecánicas de las mezclas PE/iPP.

Principales métodos:

  • Síntesis de copolímeros multibloque de PE/iPP mediante el uso de un iniciador de polimerización de alqueno isoselectivo.
  • Caracterización de la arquitectura del copolímero y los pesos moleculares.
  • Evaluación de las capacidades de soldadura y mezcla de los copolímeros con grados comerciales de PE e iPP.

Principales resultados:

  • Síntesis exitosa de copolímeros de varios bloques de PE y PPI.
  • Capacidad demostrada de los copolímeros para soldar grados comunes de PE e iPP.
  • Los copolímeros de tetrabloqueo lograron la compatibilización interfacial, lo que permitió el control morfológico.
  • Mezclas frágiles de PE y PPI transformadas en mezclas resistentes mecánicamente.

Conclusiones:

  • Los copolímeros multibloqueados PE/iPP son compatibilizadores eficaces para las poliolefinas inmiscibles.
  • Los pesos moleculares y la arquitectura de los copolímeros de bloque influyen en su rendimiento de soldadura.
  • Este enfoque ofrece una vía viable para crear materiales PE/iPP de alto rendimiento y reciclables.