Gas permeability analysis of photo‐cured cyclohexyl‐substituted polysiloxane films

Dworak, David P.; Lin, Haiqing; Freeman, Benny D.; Soucek, Mark D.

doi:10.1002/app.24480

Cited by 7 publications

(9 citation statements)

References 20 publications

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“…Polysiloxanes have been widely applied in textile, leather, construction, coating, cosmetic, and medicine industries because of their unique properties, 1−4 such as excellent air permeability 5 and hydrophobicity. 6 They are produced mainly by two routes: 7,8 hydrolytic polycondensation of dichloro-substituted silanes and ringopening polymerization (ROP) of cyclic monomers.…”

Section: Introductionmentioning

confidence: 99%

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Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Zhang

et al. 2017

Ind. Eng. Chem. Res.

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Restricted by their molecular structure defects, poly(methylphenylsiloxanes) usually exhibit a relatively low thermal stability, thus limiting their application in high-temperature areas. In this paper, we introduce a cost-effective synthesis method to prepare poly(methylphenylsiloxanes) (PPMS-M) with methyl–phenyl mixed cyclic monomers as raw materials. The molecular structure characterization shows that PPMS-M contain abundant phenyl groups, and the phenylsiloxane units are evenly distributed among methylsiloxane segments. The thermal degradation kinetics are systematically studied with the Flynn–Wall–Ozawa method. It shows that PPMS-M exhibits much higher degradation activation energy than ordinary poly(methylphenylsiloxanes) (PPMS-PD) does, which is prepared by 2,4,6-trimethyl-2,4,6-triphenylcyclotrisiloxane (P3) and octamethylcyclotetrasiloxane (D4). The thermogravimetry–Fourier transform infrared characterization shows that the degradation process of the phenyl group in PPMS-M occurs at temperatures of 100–200 °C higher than those for PPMS-PD. PPMS-M exhibits good thermal stability and a low glass transition temperature. Our method would be applied to cost-effective synthesis of other high-performance functional polysiloxanes.

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Section: Introductionmentioning

confidence: 99%

“…The polysiloxanes have the potential to exert good thermal stability because of the higher energy of the Si−O bond (460. 5 (304.0 kJ/mol) bonds. 14 There have been many studies on the thermal decomposition behavior of poly(dimethylsiloxane) (PDMS).…”

Section: Introductionmentioning

confidence: 99%

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Zhang

et al. 2017

Ind. Eng. Chem. Res.

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“…The methacrylic moiety brings crosslinking ability and the siloxane backbone gives flexibility. The crosslink density of cationic photocured polydimethylsiloxane (PDMS) and polydicyclohexylsiloxane(PDHS) cured by cationic UV-curing [47] were found to be higher than the crosslink density of the corresponding free radically photo-cured methacrylated PDMS and PDHS. This may be due to the rate of chain transfer of the initiated radical, thereby reducing the initiator efficiency.…”

Section: Resultsmentioning

confidence: 96%

Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

Chakraborty

Soucek

2010

Silicon

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Siloxanes with either methyl, cyclopentyl, or cyclohexyl groups were functionalized with methacrylate groups, then UV-cured using a free radical photo-initiator and a reactive diluent. Hexanediol dimethacrylate (0.1 wt%) was used as the reactive diluent. After curing, the mechanical, the viscoelastic, the coating, and the release properties of the cured films were studied. In addition, the oxygen permeability and the X-ray diffraction scans were evaluated. The crosslink density reduced with increase in siloxane substituent size. The oxygen permeability was dependent on crosslink density, and increased with increasing substituent size. The increase in permeability, and thus free volume, was supported by X-ray studies which showed an increase in d-spacing with increasing alkyl size. The hardness, adhesion, and solvent resistance increased as the size of the substituent increased (methyl to cyclopentyl to cyclohexyl) in the siloxane backbone. The adhesion and re-adhesion forces increased with an increase in size of the backbone substituents. There was also an increase in the advancing and the receding contact angles with the increase in substituent size.

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“…The cycloaliphatics bring the unique feature of a higher usage temperature ( T g ), and greater free volume. This will be useful for a number of applications, i.e., membranes,47, 48 and coating applications 49, 50…”

Section: Resultsmentioning

confidence: 99%

Mechanical and film properties of thermally curable polysiloxane

Chakraborty

Soucek

2009

J of Applied Polymer Sci

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Telechelic glycidyl epoxide siloxanes substituted with either methyl, cyclopentyl, or cyclohexyl groups were cured thermally with corresponding telechelic aliphatic amine. Also, the three glycidyl epoxide functionalized siloxanes were homopolymerized via a photoinitiated cationic mechanism. Both the UV and thermal curing were performed by formulating with reactive diluents. The mechanical properties, viscoelastic behavior, and coatings properties of the thermally cured siloxanes were studied. In addition, the X-ray measurements were performed. The rate of polymerization increased with the increasing size of substituent on the siloxane backbone. The hardness, adhesion, and solvent resistance increased as the bulk of the substituent increased in the siloxane backbone. The release properties for adhesion and readhesion increased with increase in steric bulk of the backbone substituents. Crosslink density reduced and oxygen permeability increased with increase in siloxane substituent size. There was also an increase in the advancing and the receding contact angles with the increase in substituent size. The inverse dependency of substituent size and free volume was observed in the d-spacing of the X-ray data.

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Gas permeability analysis of photo‐cured cyclohexyl‐substituted polysiloxane films

Cited by 7 publications

References 20 publications

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Ring-Opening Copolymerization of Mixed Cyclic Monomers: A Facile, Versatile and Structure-Controllable Approach to Preparing Poly(methylphenylsiloxane) with Enhanced Thermal Stability

Mechanical and Film Properties of Telechelic Methacrylic Polysiloxanes with Cycloaliphatic Substituents Groups for UV-Curable Applications

Mechanical and film properties of thermally curable polysiloxane

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