Structure–property behavior of poly(dimethylsiloxane) based segmented polyurea copolymers modified with poly(propylene oxide)

Sheth, Jignesh P.; Yılgör, Emel; Erenturk, Burcin; Ozhalici, Hayriye; Jonáš, Alexandr; Wilkes, Garth L.

doi:10.1016/j.polymer.2005.06.050

Cited by 75 publications

(40 citation statements)

References 22 publications

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“…However, in PUUS copolymers, the presence of the second soft segment, which has the ability to form hydrogen bonds with the hard segments, can lead to extensive phase mixing of the hard and soft segments and to a deterioration in mechanical properties due to the decrease of phase separation in the copolymers [88,89]. The second approach to the synthesis of PUS and PUUS copolymers is based on using end-functionalized PDMS as a single soft segment, whereby the terminal units attached to the ends of the siloxane oligomers act as a 'compatibilizer' between the highly polar urethane/urea hard segments and the non-polar siloxane soft segments [85].…”

Section: Poly(dimethylsiloxane)-based Biopusmentioning

confidence: 99%

Synthesis and structure-property relationships of biodegradable polyurethanes

Pergal¹,

Blaban²

2017

Biodegradable Polymers: Recent Developments and New Perspectives

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Section: Poly(dimethylsiloxane)-based Biopusmentioning

confidence: 99%

Synthesis and structure-property relationships of biodegradable polyurethanes

Pergal¹,

Blaban²

2017

Biodegradable Polymers: Recent Developments and New Perspectives

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“…The reaction was kept for 3 to 4 h until no methanol was produced. 40 To synthesize SN 2 -prePU, prePU was first synthesized with a fixed amount of PPG and TDI [The middle equation in Scheme 1]. The theoretical NCO amount was set at 5% and the final actual value of NCO amount was measured by titration to ensure that the reaction finished.…”

Section: Preparation Of Sio 2 Nanoparticlesmentioning

confidence: 99%

Transparent and durable SiO₂‐containing superhydrophobic coatings on glass

Zheng

2014

J of Applied Polymer Sci

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We fabricated novel superhydrophobic coatings based on SiO 2 nanoparticles combined with NH 2 -terminated silicone (SN 2 ) or SN 2 -modified polyurethane (SN 2 -prePU) by alternately spin-coating them onto glass slides. The final fabricated surface contained SN 2 /SiO 2 or SN 2 -prePU/SiO 2 bilayers. The conditions of spin-coating method were also explored. SN 2 -prePU with different SN 2 /prePU molar ratios were synthesized to study the influence of SN 2 ratio on the water contact angles of ultimate spin-coated surfaces. The surface was found to be tunable from hydrophobic to superhydrophobic by choosing SN 2 -prePU with different SN 2 / prePU molar ratios or SN 2 content. Water droplets easily rolled off on these superhydrophobic surfaces. Surfaces coated with SN 2 / SiO 2 bilayers showed better transparency, whereas surfaces coated with SN 2 -prePU(2 : 1)/SiO 2 bilayers exhibited better durability. Droplets of varied pH were prepared to test the anti-wettability of the coatings. Results showed that the as-coated surfaces had stable superhydrophobicity to droplets with pH values ranging from 1 to 14.

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“…This structure was most likely due to the high PDI 29 of the macroinitiator (M n , 3700 g mol À1 , PDI,B2.1), which caused the sluggish diffusion of polymer chains and formed a sharp interface between soft and hard segment segregates. 30 In these copolymers, chains were stacked in a metastable transient state that formed disordered spheres. As the pHEMA content increased to over 90 wt%, such as in H97S3, H92S8 and H96S4, the ordered structure was disrupted due to the asymmetry between the pHEMA and PDMS blocks.…”

Section: Dls Studymentioning

confidence: 99%

“…In tan d, two discrete transitions were observed at B À55 1C and B50 1C, which correspond to the melting temperature of PDMS 30 and the glass transition temperature (T g ) of pHEMA, respectively. The T g of the pHEMA homopolymer is 70 1C.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Synthesis, characterization and properties of amphiphilic block copolymers of 2-hydroxyethyl methacrylate and polydimethylsiloxane prepared by atom transfer radical polymerization

Bas

Soucek

2012

Polym J

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A series of amphiphilic poly(2-hydroxyethyl methacrylate)-b-polydimethylsiloxane-b-poly(2-hydroxyethyl methacrylate) (pHEMAb-PDMS-b-pHEMA) (A-B-A) triblock copolymers were synthesized with varying block molecular weights. Control over the polymerization, micellar size and size distribution, dynamic mechanical properties, and film morphology of nine triblock copolymers was investigated as a function of block length. The polymerization resulted in copolymers with polydispersity index below 1.5. The self-assembly behavior of the triblock copolymers was studied in selective solvents for A and B blocks. The micellar diameter was determined by dynamic light scattering and transmission electron microscopy. The film morphologies were investigated by small angle X-ray scattering. Phase separation was observed when the blocks had similar molecular weights (symmetry). However, the ordering of the morphology was disrupted when the blocks lengths were asymmetric. Phase separation was observed by atomic force microscopy when the block molecular weights were symmetric. The viscoelastic properties were examined using dynamic mechanical analysis. The modulus and crosslink density increased with increasing pHEMA content.

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Structure–property behavior of poly(dimethylsiloxane) based segmented polyurea copolymers modified with poly(propylene oxide)

Cited by 75 publications

References 22 publications

Synthesis and structure-property relationships of biodegradable polyurethanes

Synthesis and structure-property relationships of biodegradable polyurethanes

Transparent and durable SiO₂‐containing superhydrophobic coatings on glass

Synthesis, characterization and properties of amphiphilic block copolymers of 2-hydroxyethyl methacrylate and polydimethylsiloxane prepared by atom transfer radical polymerization

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Structure–property behavior of poly(dimethylsiloxane) based segmented polyurea copolymers modified with poly(propylene oxide)

Cited by 75 publications

References 22 publications

Synthesis and structure-property relationships of biodegradable polyurethanes

Synthesis and structure-property relationships of biodegradable polyurethanes

Transparent and durable SiO2‐containing superhydrophobic coatings on glass

Synthesis, characterization and properties of amphiphilic block copolymers of 2-hydroxyethyl methacrylate and polydimethylsiloxane prepared by atom transfer radical polymerization

Contact Info

Product

Resources

About

Transparent and durable SiO₂‐containing superhydrophobic coatings on glass