Morphology and physical properties of polyether‐ester thermoplastic elastomers

Buck, Warren H.; Cella, Richard J.; Gladding, E. K.; Wolfe, James R.

doi:10.1002/polc.5070480107

Cited by 38 publications

(22 citation statements)

References 10 publications

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“…The relative composition of this phase is found to be a critical factor in determining the glass transition temperature 27 The arrangement of the chains in the crystalline domains resembles that of the a-modification of the parent homopolymer PBT [7]. 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].…”

Section: IImentioning

confidence: 97%

“…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. The main feature of this model is the existence of short tie molecules connecting neighbouring domains, which act as load beares at the initial stages of tensile deformations, in a way similarly to the models used for hard elastic fibers [16].…”

Section: IImentioning

confidence: 99%

“…In view of the fact that the material exhibits only one glass transition, as indicated by differential scanning calorimetric and dynamical mechanical data, the amorphous phase has been treated as a single phase, even though it is a mixture of hard and soft segments [6][7][8][9][10][11][12][13][14]. The relative composition of this phase is found to be a critical factor in determining the glass transition temperature 27 The arrangement of the chains in the crystalline domains resembles that of the a-modification of the parent homopolymer PBT [7]. 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].…”

Section: IImentioning

confidence: 99%

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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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Section: IImentioning

confidence: 97%

Section: IImentioning

confidence: 99%

Section: IImentioning

confidence: 99%

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

Bandara

Dröscher

1983

Colloid & Polymer Sci

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“…According to (4) and (5), the macromolecular chain of PEEA may be regarded as formed by sequences of R-6NT-R' units (the distinction between R and R' is merely formal), conventionally referred to as 6NT6,6 separated by the PTMO unit specified in (5 The new description allows the separation of the true "soft" polytetramethylene oxide (PTMO) segment from the true "hard" polyesteramide 6NT6 segments. Formula (6) represents the new structural notation.…”

Section: R'mentioning

confidence: 99%

Structural investigations of segmented block copolymers. I. The morphology of poly(ether estermide)s based on poly(tetramethylene oxide) “soft” segments

Perego

Cesari

Fortuna

1984

J. Appl. Polym. Sci.

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SynopsisThe morphology of poly(ether esteramide)s (PEEA) of the general formula [(6NT6)k -PTMO]= has been investigated by wide and small angle X-ray scattering and electron microscopy techniques. The copolymers are based on poly(esteramide) "hard" segments (containing an average number k of 6NT6 consecutive units) alternating poly(tetramethy1ene oxide) (PTMO) "soft" segments of constant length (MW -900). The fraction of crystallized 6NT6 increases by increasing the PTMO content (i.e., by lowering k ) , approaching unity fork -1. The morphology is of lamellar type, with both thickness and width of the crystalline domains (6NT6) decreasing with the increase of PTMO content; in the interlamellar amorphous regions both "soft" and "hard" segments tend to segregate in separate domains. For k = 1, crystalline domains, formed essentially by isolated 6NT6 mits, alternate with amorphous PTMO interlayers. The mechanism of evolution of the morphological structure as a function of the copolymer composition is discussed.

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“…Polyester-b-polyether [7][8][9][10][11][12] is one of those in which the polyester rigidity is decreased by flexible polyether sequences. At service temperatures, these block copolymers behave like chemically crosslinked elastomers, but at elevated temperatures they soften and flow like conventional thermoplastics.…”

Section: Introductionmentioning

confidence: 99%