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Efficient hydrosilylation reaction in polymer blending: An original approach to structure PA12/PDMS blends at multiscales.

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Title: Efficient hydrosilylation reaction in polymer blending: An original approach to structure PA12/PDMS blends at multiscales.
Authors: Li, J.P.1, Cassagnau, P.1, Da Cruz-Boisson, F.2, Mélis, F.1, Alcouffe, P.1, Bounor-Legaré, V.1 bounor@univ-lyon1.fr
Source: Polymer. Mar2017, Vol. 112, p10-25. 16p.
Subjects: Hydrosilylation, Chemical reactions, Siloxanes, Carbonyl group, Functional groups
Abstract: An in situ amide hydrosilylation reaction was developed to prepare polyamide 12 (PA12)/polysiloxane copolymers by reactive blending. This reaction is focused on the addition of hydrogenosilane groups (SiH) from polysiloxane to the carbonyl group from the PA12 amide function. To evidence this carbonyl hydrosilylation onto an amide based polymer, an approach on model compounds (use of N -methylpropionamide) was carried out. The mechanism and kinetics were investigated with multinuclear NMR ( 1 H, 13 C and 29 Si). During kinetics studies, the concentration of N -silylated copolymers can reach 70 mol% after 2 h reaction at 100 °C. Amide hydrosilylation reaction was extended to the reactive blending of polyamide 12 with PDMS-SiH under molten processing conditions. Formation of a structured blend was investigated by rheology and electronic microscopy at different scales. The impact of both shearing and reaction on the final morphology was deeply studied and the interfacial enhancement by compatibilization was confirmed. As a result, the dispersion of PDMS domains decreased from 3 to 4 μm to around 0.8 μm in diameter forming submicronic morphology. Furthermore, it was possible to control the dispersion of PDMS at different scales by modifying the physico-chemical parameters (molar mass and functionality) of both components. [ABSTRACT FROM AUTHOR]
Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 121493764
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  Data: Efficient hydrosilylation reaction in polymer blending: An original approach to structure PA12/PDMS blends at multiscales.
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  Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. Mar2017, Vol. 112, p10-25. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Hydrosilylation%22">Hydrosilylation</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Siloxanes%22">Siloxanes</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonyl+group%22">Carbonyl group</searchLink><br /><searchLink fieldCode="DE" term="%22Functional+groups%22">Functional groups</searchLink>
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  Data: An in situ amide hydrosilylation reaction was developed to prepare polyamide 12 (PA12)/polysiloxane copolymers by reactive blending. This reaction is focused on the addition of hydrogenosilane groups (SiH) from polysiloxane to the carbonyl group from the PA12 amide function. To evidence this carbonyl hydrosilylation onto an amide based polymer, an approach on model compounds (use of N -methylpropionamide) was carried out. The mechanism and kinetics were investigated with multinuclear NMR ( 1 H, 13 C and 29 Si). During kinetics studies, the concentration of N -silylated copolymers can reach 70 mol% after 2 h reaction at 100 °C. Amide hydrosilylation reaction was extended to the reactive blending of polyamide 12 with PDMS-SiH under molten processing conditions. Formation of a structured blend was investigated by rheology and electronic microscopy at different scales. The impact of both shearing and reaction on the final morphology was deeply studied and the interfacial enhancement by compatibilization was confirmed. As a result, the dispersion of PDMS domains decreased from 3 to 4 μm to around 0.8 μm in diameter forming submicronic morphology. Furthermore, it was possible to control the dispersion of PDMS at different scales by modifying the physico-chemical parameters (molar mass and functionality) of both components. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Siloxanes
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