Some block copolymers illustrating the effects of siloxane and silane units on the properties of terephthalate–glycol thermoplastics

Pu, Zhengcai; Mark, J. E.; Li, Z.; Zhu, Jin

doi:10.1016/s0032-3861(99)00082-8

Cited by 21 publications

(19 citation statements)

References 3 publications

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“…Other compounds utilised include perfluoropolyether, [39][40][41] polyolefins, [42,43] or poly-(dimethyl siloxane). [44][45][46] A method of polycondensation reaction leading to interesting polycondensates has been performed by Deleens using the polyesterification of polycaprolactame and polyethers. [47] However, this kind of reaction had not been developed with PET oligomers until recent work, where copolyesterification products of PET and poly(e-caprolactone) oligomers were obtained.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(ethylene terephthalate)‐block‐Poly(tetramethylene oxide) Copolymer by Direct Polyesterification of Reactive Oligomers

Saint‐Loup

Robin

Boutevin

2003

Macro Chemistry & Physics

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The object of this study was the synthesis of thermoplastic elastomer compounds by direct copolyesterification of reactive oligomers of poly(ethylene terephthalate) (PET) and of poly(tetramethylene oxide) (PTMO). PET was glycolysed to synthesise hydroxytelechelic oligomers of PET. Commercially available hydroxytelechelic PTMO was modified to synthesise carboxytelechelic oligomers. The chemical structures of these oligomers were investigated by 1H NMR and size exclusion chromatography. Multiblock poly(ester‐ether) was then obtained by polyesterification of the hydroxytelechelic and carboxytelechelic oligomers, using different catalysts and different reaction conditions. The best stoichiometric ratio was determined to lead to the highest Mn. The chemical structure of the synthesised poly(ester‐ether) was investigated by size exclusion chromatography and 1H NMR. The thermal and thermomechanical behaviour of the synthesised poly(ester‐ether) was investigated by differential scanning calorimetry and by dynamic mechanical analysis, and showed a thermoplastic elastomer behaviour. This product could also be an interesting way of chemically recycling PET waste.Polyesterification of hydroxytelechelic PET with carboxytelechelic PTMO.magnified imagePolyesterification of hydroxytelechelic PET with carboxytelechelic PTMO.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(ethylene terephthalate)‐block‐Poly(tetramethylene oxide) Copolymer by Direct Polyesterification of Reactive Oligomers

Saint‐Loup

Robin

Boutevin

2003

Macro Chemistry & Physics

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“…There are in principle three main possibilities: RTV, HTV, and addition cure. [1] The resulting siloxane resins or elastomers have outstanding mechanical properties, but cannot easily be recycled, adding to the higher costs of these materials. Thermoplastic elastomers (TPE) offer an excellent alternative to the permanently crosslinked elastomers described above.…”

Section: Introductionmentioning

confidence: 99%

“…These are readily reversible making the TPE easier to process without curing steps and much more recyclable, thereby allowing for the recirculation of the valuable components into the silicon-cycle. TPEs that incorporate poly(siloxane)s are known from literature [1][2][3][4][5][6] and industry. [7] We have researched different possibilities for the synthesis of novel poly(siloxane) block copolymers considering both new (polar) hard blocks and formerly unused reactions to connect the siloxane and the organic building block.…”

Section: Introductionmentioning

confidence: 99%

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Direct Synthesis of Poly(dimethylsiloxane) Copolymers with TPE‐Properties via CuAAC (Click Chemistry)

Schmidt

Zehetmaier

Rieger

2010

Macromol. Rapid Commun.

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Poly(dimethylsiloxane) copolymers were synthesized directly from AA/BB monomers employing a CuAAC reaction (click chemistry) in a polyaddition approach. Using organic dialkynes and oligo(siloxane)s end-functionalized with azide moieties it was possible to obtain siloxane-based copolymers with TPE properties by click chemistry for the first time. As seen from DSC experiments, properties were strongly dependent on the incorporated organic comonomer.

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“…To improve the mechanical properties without sacrificing the desired properties of siloxane polymers, many investigations have been reported on the synthesis and characterization of block, segmented, and side-chain siloxane polymers. [3][4][5] On the other hand, aromatic polyimides are promising membrane materials because of their high-gas selectivity, low-thermal expansion, excellent mechanical properties, chemical and radiation resistance, and the possibility of accessing a rich variety of chemical structures via facile modifications of the precursor monomers. 6,7 Polysiloxanes and polyimides form the best combination to utilize their properties which compensates each other's drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Soluble rigid poly(imide‐siloxane)s: Synthesis, characterization, and structure‐property relations

Srividhya

Reddy

2008

J of Applied Polymer Sci

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Three different poly(imide-siloxane)s (PIS) containing rigid imide groups were synthesized by the reaction of amine end-capped imides to the siloxane backbone. These highly soluble amine terminated imides were synthesized by reacting fluorinated anhydride and three different amines (DDBP, DDM, DBP). The imides were grafted to the siloxane backbone by the epoxy group cleavage. All the polymers were obtained in quantitative yields with the inherent viscosities ranging from 0.32 to 0.45 dL/g. The polymers were characterized by FTIR, 1 H and 13 C NMR, and their thermal properties were studied. The DSC results showed two distinct glass transition temperatures demonstrating the existence of phase separation between the hard imide and soft siloxane groups. Polymeric membranes were prepared employing the coupling reaction between PIS and the polydimethylsiloxane matrix by varying the amount of incorporation of PIS. The membranes showed a high tensile strength of 82 MPa. The contribution of polar and dispersion component towards the total surface energy was studied by the contact angle measurements, and a reduction in surface tension of 15 mN/m was achieved with the fluorine containing PIS membrane. The study of the surface morphology was studied which confirmed the existence of phase separation in these systems.

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Some block copolymers illustrating the effects of siloxane and silane units on the properties of terephthalate–glycol thermoplastics

Cited by 21 publications

References 3 publications

Synthesis of Poly(ethylene terephthalate)‐block‐Poly(tetramethylene oxide) Copolymer by Direct Polyesterification of Reactive Oligomers

Synthesis of Poly(ethylene terephthalate)‐block‐Poly(tetramethylene oxide) Copolymer by Direct Polyesterification of Reactive Oligomers

Direct Synthesis of Poly(dimethylsiloxane) Copolymers with TPE‐Properties via CuAAC (Click Chemistry)

Soluble rigid poly(imide‐siloxane)s: Synthesis, characterization, and structure‐property relations

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