Incorporation of polydimethylsiloxane into polyurethanes and characterization of copolymers

Joki-Korpela, Fatima; Pakkanen, Tuula T.

doi:10.1016/j.eurpolymj.2011.06.006

Cited by 44 publications

(18 citation statements)

References 49 publications

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“…Dispersion state of silica particles is closely related to their reinforcement. As reported, better dispersion of SiO 2 powders to silicone composites increased both modulus and elasticity . The mechanical properties of silicone composites with and without MQ resins are presented in Figure .…”

Section: Resultssupporting

confidence: 61%

Improved processibility of silicone composites by MQ silicone resins

Huihui

Zhang³

et al. 2018

J of Applied Polymer Sci

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Processibilities of silicone composites were always a problem for their high content of SiO2 powders. This article found that the substitution of silicone resins for linear polydimethylsiloxanes (PDMS) made processibilities easier. Three silicone resins (MQ1.0, MQ1.1, and MQ1.2) with clarified chemical structures (by FT IR, 29Si NMR, and GPC) were adopted. Their shearing viscosities [η(trueγ̇)] were greatly higher than PDMS with higher molecular weight, which could be assigned to stronger molecular interactions as surface tension and flowing activation energy ΔE indicated. On the contrary, η(trueγ̇) of MQ‐PDMS binary blends greatly decreased to that even lower than either components (about 85% utmost decrease comparing to PDMS), for the variation of molecular interaction rather than dilution effect. Furtherly, when PDMS were partly replaced with MQ resins, process time of PDMS–SiO2 silicone composites were greatly shortened (from >6 to 2 h), while with better SiO2 dispersion (Mooney viscosity greatly decreased from 30.0 to 5.0 MU). Better dispersion of SiO2 fillers in composites could be confirmed by SEM and mechanical properties. For the better dispersion, mechanical properties of composites were improved with higher elastic modulus, higher tensile strength, and higher hardness, especially with higher elongation at break (utmost increased from 190% to 277%). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46445.

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Section: Resultssupporting

confidence: 61%

Improved processibility of silicone composites by MQ silicone resins

Huihui

Zhang³

et al. 2018

J of Applied Polymer Sci

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“…For membrane uses, polysiloxanes have been one of the most attractive membrane materials due to their unique properties that arise mainly from the nature of the siloxane bond and high permeability to gases and organic vapors. PUs with siloxane based soft segments are considered as high performance materials with good oxidative and thermal stability, gas permeability and biocompatibility [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Gas Permeation Properties of Synthesized Polyurethane-Polydimethylsiloxane / Polyamide 12-b-Polytetramethylene Glycol Blend Membranes

Vakili

Semsarzadeh

Ghalei

et al. 2015

Silicon

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Blend membranes of synthesized polyurethane (PU) based on toluene diisocyanate (TDI), polydimethylsiloxane (PDMS) and polytetramethylene glycol (PTMG) with polyamide 12-b-polytetramethylene glycol (PA12-b-PTMG) were prepared by a solution casting technique. The heterogeneous microstructures of the blend membranes (PU /PA12-b-PTMG) were characterized by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Gas transport properties were determined for O 2 , N 2 , CH 4 , and CO 2 gases and the obtained permeabilities were correlated with polymer properties and morphology of the membranes. Comparison of the results with that of the pure PU membrane indicates that the blend membranes had higher permeability to CO 2 , but lower permeability to O 2 , N 2 and CH 4 gases, and, therefore, had higher values of CO 2 /N 2 and CO 2 /CH 4 ideal gas pair selectivities. The blend membrane with 20 % (wt) PA12-b-PTMG showed the highest CO 2 permeability (≈105 Barrer) compared to the PU and other blend membranes. In the blend membranes with 5-20 % (wt) PA12-b-PTMG contents an enhancement of CO 2 /CH 4 (≈ 10) and CO 2 /N 2 (≈ 52) selectivities was observed. The experimental permeabilities of the blend membranes were compared with the calculated permeabilities based on a modified additive logarithmic model.

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“…Study and characterization of PDMS's mechanical, chemical and optical properties are reported for specific cases in the literature; some fabrication methods are also mentioned to modify properties such as (a) curing and baking conditions, (b) different proportions of curing base agent, (c) different types of PDMS and other polymers, (d) inclusion of other molecules or particles and (e) elaboration of samples with different forms and sizes [13,[28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Polynomial fitting techniques applied to opto-mechanical properties of PDMS Sylgard 184 for given curing parameters

Santiago-Alvarado

Cruz-Félix

González-García

et al. 2020

Mater. Res. Express

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Mechanical and optical properties of Polydimethylsiloxane (PDMS) have been measured and reported for different applications, however, a full analysis and a compendium of its tension and compression moduli behaviour have not been carried out, nor of its refractive index, for several mixture ratios, temperature and curing time. In this work, samples of PDMS were manufactured and tested to know tension and compression moduli and refractive index as a function of fabrication parameters; Minitab ® , Matlab ® 's Least-squares fitting in Curve Fitting Toolbox™ and genetic algorithms were employed to yield functional dependencies to describe PDMS's behavior. The obtained fitting polynomials are shown to have large agreement with experimental data. Finally, a potential application in the design of a gradient index lens for use in artificial vision is presented.

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Incorporation of polydimethylsiloxane into polyurethanes and characterization of copolymers

Cited by 44 publications

References 49 publications

Improved processibility of silicone composites by MQ silicone resins

Improved processibility of silicone composites by MQ silicone resins

Characterization and Gas Permeation Properties of Synthesized Polyurethane-Polydimethylsiloxane / Polyamide 12-b-Polytetramethylene Glycol Blend Membranes

Polynomial fitting techniques applied to opto-mechanical properties of PDMS Sylgard 184 for given curing parameters

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