Properties of Poly(tetramethylene Oxide)-Poly(tetramethylene Terephthalate) block polymers

Lilaonitkul, Amnuey; West, James C.; Cooper, Stuart L.

doi:10.1080/00222347608208662

Cited by 107 publications

(67 citation statements)

References 33 publications

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“…1 Segmented copolymers are characterized for their random structure in which soft and hard segments are intercalated in the chain backbone. [2][3][4][5] Soft segments are flexible and they possess a relatively low glass transition temperature (so, it is assumed that it induces a reversible elastic behavior), whereas the hard segments can be glassy amorphous or semicrystalline and acts as "physical crosslinks" (improving mechanical properties).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a poly(ether–ester) copolymer from poly(2,6 dimethyl‐1,4‐phenylene oxide) and poly(ethylene terephthalate)

García-Gaitán

Pérez-González

Zárate-Acevedo

et al. 2005

J of Applied Polymer Sci

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A series of poly(ether-ester) copolymers were synthesized from poly(2,6 dimethyl-1,4-phenylene oxide) (PPO) and poly(ethylene terephthalate) (PET). The synthesis was carried out by two-step solution polymerization process. PET oligomers were synthesized via glycolysis and subsequently used in the copolymerization reaction. FTIR spectroscopy analysis shows the coexistence of spectral contributions of PPO and PET on the spectra of their ether-ester copolymers. The composition of the poly(ether-ester)s was calculated via 1 H NMR spectroscopy. A single glass transition temperature was detected for all synthesized poly-(ether-ester)s. T g behavior as a function of poly(ether-ester) composition is well represented by the Gordon-Taylor equation. The molar masses of the copolymers synthesized were calculated by viscosimetry.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a poly(ether–ester) copolymer from poly(2,6 dimethyl‐1,4‐phenylene oxide) and poly(ethylene terephthalate)

García-Gaitán

Pérez-González

Zárate-Acevedo

et al. 2005

J of Applied Polymer Sci

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“…In the previous paper7) we treated the phase transition of PBT sample thermodynamically and indicated a suitableness of applying the ClausiusClapeyron equation for the one-dimensional tensile stress; (1) …”

Section: Methodsmentioning

confidence: 99%

Stress-induced crystalline phase transition in block copolymers of poly(tetramethylene terephthalate) and poly(tetramethylene oxide). I Dependence of transitional behavior on hard/soft segmental ratio.

et al. 1986

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Stress-induced solid-state transition has been found to occur in the multi block copolymers of poly(tetramethylene terephthalate)[PTMT] and poly(tetramethylene oxide) [PTMO]. In the crystalline regions of PTMT hard segments, the reversible structural change has been observed when the uniaxially-oriented sample is stretched along the draw direction. This is essentially the same phenomenon as that observed in PTMT homopolymer, although the transition in the block-copolymer requires appreciably larger tensile strain than the homopolymer case because of the coexistence of the PTMO soft segments with very low Young's modulus. In the PTMO soft segments, which are in the amorphous state at room temperature under free tension, there has been found to occur the stress-induced crystallization into the fully extended trans-zigzag conformation. At lower temperature below the glass transition point, these transitions in the hard and soft segments can be observed more clearly and sharply. The transitional behaviors have been compared among a series of samples with different molar fractions of PTMT hard segments and interpreted semiquantitatively based on a simple mechanical series model coupled with the crystalline phase transition in the PTMT hard segment. By measuring the temperature dependence of the critical stress at which the phase transition occurs abruptly, the transitional enthalpy and entropy have been evaluated.

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“…These crystalline domains are believed to exist in the form of lamellae where the short dimension coincides with the chain direction [6,7,10,14]. Nevertheless, controversial opinions are found in the literature with regard to how the lamellae aggregate themselves to form superstructures [6,[10][11][12][13]. Cella [6] and Buck et al [7] explained the observed mechanical properties by a model of interpenetrating and continuous crystalline and amorphous domains.…”

Section: IImentioning

confidence: 92%

The two-phase structure of segmented block copoly(ether ester)

Bandara

Dröscher

1983

Colloid & Polymer Sci

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Abstract:The annealing induced morphological changes in isotropic block copoly(ether ester)s are investigated by small angle X-ray scattering methods. The observed results are consistent with a lamellar model which is comprised of a crystalline core of thickness 35 to 45 ~-, a diffuse boundary zone of width 9 ]l, and an amorphous layer which is varying strongly in thickness. The enhanced crystallinity of the samples annealed at higher temperatures is mainly due the lateral growth of the lamellae ; the long period increases by not more than 20%. The scattering power of the samples is explained by means of an equivalent two-phase model in which the crystalline phase has the same structure as the ceform of poly(butylene terephthalate), whereas the amorphous phase is a mixture of the uncrystallized ester segments and the ether segments. The crystallinity determined from the scattering power is very much higher than that determined from thermoanalytical investigations.

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Properties of Poly(tetramethylene Oxide)-Poly(tetramethylene Terephthalate) block polymers

Cited by 107 publications

References 33 publications

Synthesis and characterization of a poly(ether–ester) copolymer from poly(2,6 dimethyl‐1,4‐phenylene oxide) and poly(ethylene terephthalate)

Synthesis and characterization of a poly(ether–ester) copolymer from poly(2,6 dimethyl‐1,4‐phenylene oxide) and poly(ethylene terephthalate)

Stress-induced crystalline phase transition in block copolymers of poly(tetramethylene terephthalate) and poly(tetramethylene oxide). I Dependence of transitional behavior on hard/soft segmental ratio.

The two-phase structure of segmented block copoly(ether ester)

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