Tri-block copolymers with mono-disperse crystallizable diamide segments: Synthesis, analysis and rheological properties

Arun, A.; Gaymans, R.J.

doi:10.1016/j.polymer.2008.03.049

Cited by 31 publications

(54 citation statements)

References 38 publications

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“…Deuterated trifluoroacetic acid (TFA-d), 1,1,1,3,3,3-hexafluoro isopropanol (HFIP), 1,1,2,2-tetrachloroethane and phenyl benzoate were purchased from Aldrich Chemicals. TFT-dimethyl [4] and TFBmonomethyl [9] were synthesized according to procedures presented elsewhere, and the triblock copolymers, (ABA), were prepared as described in a previous report. [9] General Procedure for the Synthesis of the Block Copolymers Block copolymers were synthesized using a solution/melt polymerization technique.…”

Section: Experimental Partmentioning

confidence: 99%

“…In a multiblock copolymer, the polymer chain passes the crystalline ribbons several times, and the crystallites are the network points for the continues amorphous phase. Triblock copolymers (ABA) with monodisperse amide [8,9] or urethane segments [10,11] at the end of the chain are new. These materials have a homogeneous melt, display very high crystallinities, and the end-HSs crystallize very fast upon cooling.…”

mentioning

confidence: 99%

“…Already at low molecular weights (>6 000 g mol À1 ), the triblock copolymers are fractured in a ductile manner. [9,11] However, a diblock AB or triblock BAB copolymer have only one HS per polymer chain. The A segments can crystallize, but the B segments are not expected to be part of a network.…”

mentioning

confidence: 99%

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Structure and Properties of Mono‐, Di‐, Tri‐ and Multiblock Segmented Copolymers with Diamide Hard Segments

Arun

Dullaert

Gaymans

2008

Macro Chemistry & Physics

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Well‐defined segmented block copolymers were studied as the number and position of hard segments in the chain was varied. The hard segments were diamides of uniform length (A), and the synthesized copolymers were mono‐, di‐, tri‐ or multiblock using the soft segment (B), poly(tetramethylene oxide), with a molecular weight of 2 900 g mol−1 and extended with terephthalate groups to reach a maximum of 20 000 g mol−1. The diamide segments in the chain displayed very high crystallinities and a ribbon‐like structure with high aspect ratio. The copolymer without hard segments was a semi‐solid. For the materials with one diamide unit in the chain, the modulus was high but the yield and fracture strengths low. When two or more diamide units were used, both the modulus and values for the yield and fracture strengths were high.magnified image

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Section: Experimental Partmentioning

confidence: 99%

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confidence: 99%

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Structure and Properties of Mono‐, Di‐, Tri‐ and Multiblock Segmented Copolymers with Diamide Hard Segments

Arun

Dullaert

Gaymans

2008

Macro Chemistry & Physics

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“…The investigation of rheological properties of polymeric materials under molten state is crucial to gain a fundamental understanding of the nature of the processability and the structure-property relationship of these materials. 5 The rheological properties of polymeric materials were found to have a close relationship with the structures of copolymers 31,32 and polymer blends. 33 For polymer composites, rheology has also proven to be exquisitely sensitive to particle loading shape, size and distribution for a wide range of filler types.…”

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confidence: 91%

Structure‐rheology responses of polylactide/calcium carbonate composites

Gu¹,

Cun-yang²,

Zhou³

et al. 2009

J of Applied Polymer Sci

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Polylactide (PLA) and calcium carbonate (CaCO 3 ) were melt blended using a twin-screw extruder. The morphology of PLA/CaCO 3 composites was observed by scanning electronic microscopy. The linear and nonlinear shear rheological behaviors of PLA/CaCO 3 melts were investigated by an advanced rheology expended system. The results show that the CaCO 3 particles are evenly dispersed in the PLA matrix. The incorporation of low CaCO 3 content (<20%) causes the reduction of the storage moduli, loss moduli, and dynamic viscosities whereas high CaCO 3 content (>30%) leads to the increase of the storage moduli, loss moduli, and dynamic viscosities. The composites with high CaCO 3 content show pseudo-solidlike behaviors at low frequency. High CaCO 3 content also results in a significant increase of flow activation energy and a dramatic decrease of flow index n, which is in consistent with the more serious shear-thinning tendency of high-filled PLA composites melts. The particular rheological responses might be attributed to the formation and destruction of the percolating network.

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“…Segmented poly(ether amide)s comprising uniform amide based hard segments have been extensively studied by Gaymans and coworkers 33,34,46,47,[51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] . Chemical structures of these segments, such as the di-aramid segment (TΦT) composed of dimethyl terephthalate (T) and 1,4-phenylenediamine (Φ) or the tetra-amide segment (T6T6T)…”

Section: Uniform Hard Segmentsmentioning

confidence: 99%

Oxalamides as a hydrogen bonding motif in thermoplastic elastomers

Sijbrandi¹

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Tri-block copolymers with mono-disperse crystallizable diamide segments: Synthesis, analysis and rheological properties

Cited by 31 publications

References 38 publications

Structure and Properties of Mono‐, Di‐, Tri‐ and Multiblock Segmented Copolymers with Diamide Hard Segments

Structure and Properties of Mono‐, Di‐, Tri‐ and Multiblock Segmented Copolymers with Diamide Hard Segments

Structure‐rheology responses of polylactide/calcium carbonate composites

Oxalamides as a hydrogen bonding motif in thermoplastic elastomers

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