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Synthesis and Properties in Solution of Gaussian Homo Asymmetric Polysiloxanes with a Bulky Side Group

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Abstract

Ring opening polymerization (ROP) of 1,3,5-tri-n-hexyl,1,3,5-trimethylcyclotrisiloxane (D Hexa3 ) and 1,3,5-tri-n-heptyl,1,3,5-trimethylcyclotrisiloxane (D Hepta3 ) was promoted by acid-treated synthetic silica–alumina to obtain Gaussian homo asymmetric polysiloxanes. Mw was above 70 kg/mol, meaning that homo asymmetric bulky side-group polysiloxane chains with high molecular weight were obtained. The material was treated in an acidic medium to improve the contents of acid sites and successfully tested as an inorganic acidic catalyst for ROP of D Hexa3 and D Hepta3 cyclosiloxanes. The samples of poly(methylhexylsiloxane) (PMHS) and poly(methylheptylsiloxane) (PMHepS) obtained were structurally characterized mainly by 29Si NMR. All the experimental values including the refractive index increment (dn/dc), the second virial coefficient (A2), the square root of the mean square radius of gyration (\( \langle {{\text{RMS}}_{\text{radius}}}^{ 2} \rangle^{ 1/ 2} \)), the average molecular weight (Mw), the average molecular numeral (Mn), and the weight polydispersity (Mw/Mn) were obtained using a gel permeation chromatography/light scattering (GPC/LS) coupled system. The A2 experimental value for the two polymers (between 4 and 6.5 × 10−4 mol/mL g2) indicated that toluene was a good solvent. In addition, PMHS and PMHepS \( \langle {{\text{RMS}}_{\text{radius}}}^{ 2} \rangle^{ 1/ 2} \) were greater than 30 nm, indicating that larger chains of high molecular weight were obtained.

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Acknowledgments

Javier Vallejo wishes to thank Consejo Nacional de Ciencia y Tecnología (CONACYT-Mexico) and The University of Guanajuato, Guanajuato, Mexico for financial support and to Dr. Ramón Zárraga and Dr. José Alfredo Gutierrez of the Chemistry Department (University of Guanajuato) for their comments and suggestions.

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Authors and Affiliations

  1. División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Campus Guanajuato, Col. Noria Alta s/n, 36050, Guanajuato, GTO, Mexico

    Javier Vallejo-Montesinos, Antonio Villegas, Araceli Jacobo-Azuara, J. Merced Martínez, Eulalia Ramírez & Jorge Cervantes

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  1. Javier Vallejo-Montesinos
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  2. Antonio Villegas
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  3. Araceli Jacobo-Azuara
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  4. J. Merced Martínez
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  5. Eulalia Ramírez
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  6. Jorge Cervantes
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Correspondence to Antonio Villegas.

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Vallejo-Montesinos, J., Villegas, A., Jacobo-Azuara, A. et al. Synthesis and Properties in Solution of Gaussian Homo Asymmetric Polysiloxanes with a Bulky Side Group. J Inorg Organomet Polym 22, 1332–1340 (2012). https://doi.org/10.1007/s10904-012-9770-0

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  • DOI: https://doi.org/10.1007/s10904-012-9770-0

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