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Influential Factors in the Synthesis of Polymethylhydrogenosiloxane Obtained via Cationic Ring-Opening Polymerization Using Synthetic Silica-Aluminates as Catalysts

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Abstract

In the ambit of the synthesis of silicon polymers and elastomers, there are a lot of variables that affect the final properties of the material, and consequently, their applications. In this work, we synthetized polymethylhydrogensiloxane using the ring opening polymerization (ROP) with 2,4,6,8-tetramethylcyclotetrasiloxane as monomer (D4H), a synthetic aluminosilicate like catalytic species and hexamethyldisiloxane as chain blocker. We made a set of experiments, in order to find the effect on the reaction yield, the absence of crosslinking, crosslinking degree and the mechanical properties of the final polymers. We found that the factor “chain blocker addition time” is significant for yield reaction and crosslinking degree of the elastomers, obtaining a greater crosslinking degree and reaction yield when is added at the beginning of the reaction. Also, using DSC measurements, we found an endothermal signal in 553 K corresponding to the elastomer’s chains rearrangement to dissipate the heat supplied. We obtained PMHS chains up to 24,270 g/mol indicating the ability of this kind of catalysts to achieve relatively high molecular weight chains.

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Acknowledgements

The authors want to thank Laboratorio Nacional de Caracterización de Propiedades Fiscoquímicas y Estructura Molecular UG-UAA-CONACyT and Dr. Murali Venkat Unnmatla for the facilities given in the NMR and SEM tests. Also, the authors want to thank Dr. José Elías Pérez López for the facilities provided in the rheological tests and the Centro de Investigación en Química Aplicada (CIQA) and M.S. Claudia Cecilia Rivera Vallejo for the SLS tests.

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Authors and Affiliations

  1. Catedra CONACYT-Instituto de Física, Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, 78000, San Luis Potosí, Mexico

    J. A. González Calderón

  2. División de Ciencias Naturales y Exactas, Campus Guanajuato Departamento de Química, Universidad de Guanajuato, 36050, Guanajuato, Mexico

    David Contreras López, Javier Alejandro Balcázar Pérez, Adrián Austria Gutiérrez, Ramón Zarraga & Javier Vallejo-Montesinos

  3. Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna 140, 25294, Saltillo, Mexico

    Ricardo Mendoza-Carrizales

Authors
  1. J. A. González Calderón
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  2. David Contreras López
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  3. Javier Alejandro Balcázar Pérez
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  4. Adrián Austria Gutiérrez
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  7. Javier Vallejo-Montesinos
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Correspondence to Javier Vallejo-Montesinos.

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Glossary

Brij35

Nonionic surfactant

D3

Hexamethylcyclotrisiloxane

D4

Octamethylcyclotetrasiloxane

D6

Dodecamethylcyclohexasiloxane

DBSA

Dodecylbenzenesulfonic acid

DDS

Dichlorodimethylsilane

GPC

Gel Permeation Chormatography

MM

Hexamethyldisiloxane

PDI

Polidispersity Index

PDMS

Polydimethylsiloxane

PMHS

Polymethylhydrogenosiloxane

ROP

Ring Opening Polymerization

SEC

Size Exclusion Chromatography

Tg

Glass transition temperature

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González Calderón, J.A., Contreras López, D., Balcázar Pérez, J.A. et al. Influential Factors in the Synthesis of Polymethylhydrogenosiloxane Obtained via Cationic Ring-Opening Polymerization Using Synthetic Silica-Aluminates as Catalysts. Silicon 12, 1059–1074 (2020). https://doi.org/10.1007/s12633-019-00208-3

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