Poly(ether amide) segmented block copolymers with adipic acid based tetraamide segments

Biemond, G.J.E.; Feijén, Jan; Gaymans, R.J.

doi:10.1002/app.26202

Cited by 50 publications

(184 citation statements)

References 27 publications

(62 reference statements)

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“…Results and discussion PTMO x -T6A6T copolymers are transparent TPE materials with a well-defined morphology [15]. The PTMO x length was varied from 650 to 2900 Da, and the mono-disperse bisester tetra-amide segment T6A6T readily crystallized into nano-ribbons with high aspect ratios [15].…”

Section: Tensile Testsmentioning

confidence: 99%

“…The hard segment (HS) crystallites have a nano-ribbonlike structure with a high aspect ratio [10][11][12][13][14], and these nano-ribbons reinforce the soft phase [3,4,15]. Upon stretching of such a copolymer, both the soft and the hard phases are deformed, and for a high enough strain, yielding of the hard phase occurs [13,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The mono-disperse segments crystallize fast and almost completely, and as a result, the soft phase contains very little dissolved HSs [3,4,14,15,17,18]. The mono-disperse HSs have crystallites with nano-ribbon-like structures with high aspect ratios (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…A PTMO x -T6A6T system ( Fig. 2), with an emphasis on PTMO 2000 -T6A6T [15], was chosen for this investigation. PTMO x -T6A6T segmented block copolymers have been defined as TPEs consisting of alternating soft (PTMO) and hard segments (T6A6T) [15].…”

Section: Introductionmentioning

confidence: 99%

“…2), with an emphasis on PTMO 2000 -T6A6T [15], was chosen for this investigation. PTMO x -T6A6T segmented block copolymers have been defined as TPEs consisting of alternating soft (PTMO) and hard segments (T6A6T) [15]. The T6A6T segments have a symmetric structure with tetra-amide groups that can H-bond with both neighboring T6A6T units.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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The tensile properties of segmented block copolymers with mono-disperse hard segments were studied with respect to the hard segment content (16-44 wt.%) and the temperature (20-110°C). The copolymers were comprised of poly(tetramethylene oxide) segments with the molecular weights of 650-2,900 Da and of mono-disperse bisester-tetra-amide segments (T6A6T) based on adipic acid (A), terephthalic acid (T) and hexamethylene diamine (6). An increasing content of T6A6T gave rise to an increased modulus, yield stress and fracture stress. The modulus could be modeled by a composite model. Moreover, a strain-softening was observed well below the yield stress, due to the shearing of the T6A6T crystallites. At strains [200%, a strain-hardening of the PTMO segments took place and this even for PTMO segments that were amorphous in the isotropic state. The strain hardening increased the tensile properties. An increase in temperature had little effect on the modulus of the copolymers, but was found to lower the yield and fracture stresses. At temperatures above the melting temperature of the oriented PTMO, no strain-hardening took place. The yield stress as a function of temperature could be described by the Eyring relationship, but a modulus-yield stress relationship could not be established.

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Section: Tensile Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tensile properties of segmented block copolymers with monodisperse hard segments

2008

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Triblock Copolymers Based on Monohydroxy Polystyrene with Crystallizable Amide Segments: Synthesis and Characterization

et al. 2015

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Four series of triblock copolymers are studied, which are synthesized by reacting monofunctionalized polystyrene with crystallizable amide segments such as diamide (T T and T6T) and tetraamide (T6T6T and T6A6T). The difunctional amide segment consists of two terephthalic groups at the outside (T). The length of the soft segment changed from 1000 to 8000 g/mol using difunctionalized polystyrene (PSt) and thereby the concentration of the hard segment is varied from 35 to 4 wt%. The molecular weight of the triblock copolymer is determined by the inherent viscosity measurement method. The FT-IR results reveal that the degree of crystallinity of the amide segments in the copolymer is high 79%. The differential scanning calorimetry shows the T g for amorphous polystyrene and T m for crystallizable hard segments. Depending on the amide concentration in the copolymer, the diamide and tetraamide melting temperature ranged between 125 to 280°C. All the thermogravimetric data reveal that the polymer shows single-stage decomposition temperature centered around 410°C. The solvent resistivity of these materials is very high even at a low concentration of (4%) amide content. All the copolymers show low water absorption. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2016, , 21541; View this article online at wileyonlinelibrary.com.

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Polyurethanes with monodisperse rigid segments based on a diamine–diamide chain extender

Biemond

Braspenning

Gaymans

2007

J of Applied Polymer Sci

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Polyether(bisurethane-bisurea-bisamide)s (PEUUA) based on poly(tetramethylene oxide) (PTMO) were synthesized by chain extension of PTMO endcapped with a diisocyanate (DI), and a diamine-diamide extender. The prepolymers were PTMOs with molecular weights between 1270 and 2200 g mol 21, either endcapped with 4,4 0 -diphenylmethane diisocyanate (MDI), 2,4-toluene diisocyanate (2,4-TDI), or 1,6-hexane diisocyante (HDI) and with a low content of free diisocyanate (<0.1 wt %). The diaminediamide (6A6) extender was based on hexamethylene diamine (6) and adipic acid (A). In this way, segmented polyurethanes with monodisperse rigid segments (DI-6A6-DI) were obtained. The PEUUAs were characterized by DSC as well as temperature-dependent FTIR and DMTA. The mechanical properties of the polymers were evaluated by compression set and tensile test measurements. The polyurethanes with monodisperse rigid segments displayed low glass transition temperatures, almost temperature-independent rubbery plateaus and sharp melting temperatures. The crystallinities of the hard segments were 70-80% upon heating and 40-60% upon cooling. The rate of crystallization was moderately fast as the supercooling (T m 2 T c ) was in the order 36-548C. The polyurethanes based on HDI had a much higher rubber modulus as compared to the MDI and 2,4-TDI-based polymers, because of a higher degree of crystallinity and/or a higher aspect ratio of the crystallites. The HDI residues are flexible and not sterically hindered and could therefore be more easily packed than MDI or 2,4-TDI residues. Polyurethanes with monodisperse DI-6A6-DI hard segments have interesting properties.

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Poly(ether amide) segmented block copolymers with adipic acid based tetraamide segments

Cited by 50 publications

References 27 publications

Tensile properties of segmented block copolymers with monodisperse hard segments

Tensile properties of segmented block copolymers with monodisperse hard segments

Triblock Copolymers Based on Monohydroxy Polystyrene with Crystallizable Amide Segments: Synthesis and Characterization

Polyurethanes with monodisperse rigid segments based on a diamine–diamide chain extender

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