Liquid-crystalline main-chain polymers with a poly(p-phenylene terephthalate) backbone: 5. Dynamic mechanical behaviour of the polyester with dodecyloxy side chains

Damman, S.B.; Buijs, J.A.H.M.

doi:10.1016/0032-3861(94)90773-0

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…The apparatus has been described in detail in a publication of Damman and Buijs. 8 Measure-4,4-dihydroxybiphenyl, and 4 mL of DMAc was added. The reaction flask was blanketed with N 2 ments were taken at temperature intervals of 4ЊC, and at frequencies of 1 and 10 Hz.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, thermal, and mechanical characterization of liquid-crystalline polyhydroxyethers

Bruggeman

Damman²,

Tinnemans³

1997

J. Appl. Polym. Sci.

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High molecular weight liquid-crystalline polyhydroxyethers, containing functional hydroxy groups, were synthesized from an aromatic diol and the diglycidylether of an aromatic diol. The polymers showed a liquid-crystalline melt when about 70% or more of the aromatic units in the chain were biphenyl units. Tensile modulus values varied from 3 GPa for as-cast films to 6 GPa for drawn films. These polymers are potentially suitable candidates to reinforce common thermoplastics by reactive blending. For this purpose polyhydroxyethers have been prepared, having a liquidcrystalline melt in the processing range of PET, viz. 260-290ЊC.

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Section: Methodsmentioning

confidence: 99%

Synthesis, thermal, and mechanical characterization of liquid-crystalline polyhydroxyethers

Bruggeman

Damman²,

Tinnemans³

1997

J. Appl. Polym. Sci.

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“…The reported tensile strength is an average of at least six measurements. The dynamic tensile modulus was determined on an apparatus designed at TNO 22. Measurements were taken at 10 Hz and 25°C.…”

Section: Methodsmentioning

confidence: 99%

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Bruggeman

Tinnemans

1999

J. Appl. Polym. Sci.

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Poly(ethylene terephthalate) modified with a dianhydride (PET-anhydride) was melt-blended with a liquid crystalline copolyester (Vectra A) in the presence of a small amount of a liquid crystalline polyhydroxyether. The mechanical properties of a blend consisting of PET-anhydride/Vectra A/polyhydroxyether were drastically improved compared to blends without polyhydroxyether or without anhydride. Meltspun fibers of PET-anhydride/Vectra A/polyhydroxyether in a 80/20/0.75 weight ratio displayed a much higher tensile modulus (17 GPa) and tensile strength (214 MPa) than did a 80/20 PET-anhydride/Vectra A blend (4 GPa and 60 MPa, respectively). A similar increase in modulus and strength was found for a 90/10/0.75 relative to a 90/10 blend. The tensile moduli of the blends can well be described by the Tsai-Halpin equation. A better fibril formation was observed, which was attributed to an improved viscosity ratio. Reactions between the various functional groups during melt processing were indicated by viscosity measurements. The polyhydroxyether may act as a reactive compatibilizer which improves the interfacial adhesion, chemically and/or physically. WAXD recordings of both blends showed a crystalline and highly oriented Vectra phase. The PET phase was unoriented and amorphous in a PET/Vectra blend and semicrystalline and weakly oriented in a PET/Vectra/polyhydroxyether blend. Postdrawing of the various blend fibers to ϭ 4 increased the modulus by about 40% and the tensile strength by more than 100%, mainly through orientation of the PET phase.

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“…The polymers have been clarified to form various kinds of characteristic phase structures depending on the conformational and dynamic behaviors of the n-alkyl side-chains in a wide range of temperatures by using X-ray diffraction [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

A study of diffusional behavior of polymer having semiflexible main-chain with long n-alkyl side-chains as associated with structural behavior of the side-chains

Inoue

Matsui

Kuroki

et al. 2010

Journal of Molecular Structure

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Liquid-crystalline main-chain polymers with a poly(p-phenylene terephthalate) backbone: 5. Dynamic mechanical behaviour of the polyester with dodecyloxy side chains

Cited by 10 publications

References 9 publications

Synthesis, thermal, and mechanical characterization of liquid-crystalline polyhydroxyethers

Synthesis, thermal, and mechanical characterization of liquid-crystalline polyhydroxyethers

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

A study of diffusional behavior of polymer having semiflexible main-chain with long n-alkyl side-chains as associated with structural behavior of the side-chains

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