Multimodal polymer networks: design and characterisation of nanoheterogeneous PU elastomers

Goering, H.; Krüger, Hartmut; Bauer, Monika

doi:10.1002/(sici)1439-2054(20000501)278:1<23::aid-mame23>3.0.co;2-p

Cited by 17 publications

(9 citation statements)

References 14 publications

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“…Segmented polyurethane elastomers are composed of soft segments and more rigid, polar hard segments. The soft segments are formed generally from polyethers or polyesters and the hard segments based on diisocyanate and a low‐molecular‐weight chain extender 1–23…”

Section: Introductionmentioning

confidence: 99%

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Supramolecular structure of crosslinked polyurethane elastomers based on well‐defined prepolymers

Pilch‐Pitera

Król

Pikus

2008

J of Applied Polymer Sci

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This article provides both quantitative and qualitative evaluations of supermolecular structures present in segmented polyurethane elastomers. This work presents our recent results from investigation of the microdomain morphology of poly-(ether-urethanes) based on polyethylene glycol and poly-(ester-urethanes) based on poly-e-caprolactone diol with different molecular weight as soft segments and hard segments based on the combination of TDI and triethanolamine or 4,4 0 ,4 00 -triphenylmethane triisocyanate (Desmodur RE). Those PU elastomers were obtained not only in a typical one-step method but also in the prepolymer method with the use of urethane oligomers with controlled molecular weight distribution (MWD). Prepolymers with well-defined chain structures and narrow distributions of their molecular weights (MWD) M w =M n ¼ 1.1-1.6 were produced in a multistage method, i.e., in step-by-step polyaddition of 2,4-and 2,6-TDI with polyoxyethylenediols or polycaprolactonediols of different molecular weights. Isocyanate oligomers obtained at individual stages were then crosslinked with triethanolamine, whereas hydroxyl-terminated oligomers were crosslinked with Desmodur RE. Microdomain morphology of the soft and hard-segments structure was characterized by means of wide-angle Xray scattering and scanning electron microscope. The phase morphology and microdomain crystallinity were investigated.

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Section: Introductionmentioning

confidence: 99%

“…Many characterization techniques have been used to understand the relationship between the chemical architecture, morphology, and chemical properties 1–23. It is believed that the size, shape, and structure of the hard‐segment and soft‐segment domains play a decisive role in determination of mechanical properties 6, 8, 19…”

Section: Introductionmentioning

confidence: 99%

Supramolecular structure of crosslinked polyurethane elastomers based on well‐defined prepolymers

Pilch‐Pitera

Król

Pikus

2008

J of Applied Polymer Sci

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“…The urethane groups, which link the hard segments and the flexible segments together by means of both covalent bonds and hydrogen bonds, are usually arranged at the border line between domains. However, the microphase separation is not complete and hence some hard segments can be found dispersed within the domains of soft segments to form the intermediate phase 3…”

Section: Introductionmentioning

confidence: 99%

Phase structure and thermal stability of crosslinked polyurethane elastomers based on well‐defined prepolymers

Król

Pilch‐Pitera

2007

J of Applied Polymer Sci

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Taking advantage of the DSC method, general procedures were presented for qualitative and quantitative evaluation of the phase separation degree and the crystalline phase content in polyurethane elastomers with well-defined structures. Those elastomers were obtained not only in a typical one-step method but also in the prepolymer method with the use of urethane oligomers with controlled molecular weight distribution (MWD). Prepolymers with well defined chain structures and narrow distributions of their molecular weights (MWD) M w /M n ¼ 1.1-1.3 were produced in a multistage method, i.e., in step-by-step polyaddition of 2,4-and 2,6-TDI with polyoxyethylenediols or with polycaprolactonediols of varied molecular weights. Isocyanate oligomers obtained at individual stages were then crosslinked with triethanolamine, whereas hydroxyl-terminated oligomers were crosslinked with 4,4 0 ,4 00 -triphenylmethane triisocyanate (Desmodur RE). The obtained polyurethane elastomers were found to be characterized by the presence of five phases: soft phase consisted of flexible polyol-type segments, crystalline phase made of soft segments, crystalline and amorphous hard phase made of hard segments, and intermediate phase, which was a composition of the soft and hard segments. The polyurethanes obtained out of prepolymers with defined MWD were characterized by better phase separation of the soft segments and increased structural order inside the hard phase as well as by better thermal stability than polyurethanes obtained from the typical one-step method. The structural effects were also discussed on the thermal properties of the synthesized elastomers as analyzed by the TG and DTA methods.

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“…Further purpose is to match some very important properties of two polymers along with diminishing their individual disadvantages. Also, the main goals of blending are the modification of the mechanical properties and improvement of the impact strength at low temperatures and particularly the abrasion resistance, as well as the improvement of process ability .…”

Section: Introductionmentioning

confidence: 99%

Mechanical and interfacial properties of compatibilized polyurethane blends

Mihaljević

Bajsić

2017

Polymer Engineering & Sci

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The effects of two different styrene‐ethylene/butylene‐styrene (SEBS; SEBS‐g‐MA) block copolymers as potential compatibilizers for thermoplastic polyurethane/isotactic polypropylene blends (TPU/iPP), at different composition were investigated. The compatibilizers involved are unfunctionalized SEBS and functionalized grades containing maleic anhydride grafted to the midblock (SEBS‐g‐MA). Compatibility of each TPU/iPP/SEBS and TPU/iPP/SEBS‐g‐MA polymer blend was compared investigating mechanical, morphological, thermal and interfacial properties. From the results of the interfacial surface free energy, SEBS‐g‐MA is optimal compatibilizer which located at the interface of TPU and iPP phase exhibited much better synergy and improved the compatibility between the TPU and iPP phase. Accordingly, TPU/iPP/SEBS‐g‐MA showed better mechanical properties (higher tensile strength, elongation at break, and E modulus) and finer and more stable morphologies that were clearly observed by scanning electron microscopy. The thermogravimetric analysis confirmed these results showing pronounced thermal stability by addition of functionalized compatibilizer. POLYM. ENG. SCI., 58:1911–1922, 2018. © 2017 Society of Plastics Engineers

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Multimodal polymer networks: design and characterisation of nanoheterogeneous PU elastomers

Cited by 17 publications

References 14 publications

Supramolecular structure of crosslinked polyurethane elastomers based on well‐defined prepolymers

Supramolecular structure of crosslinked polyurethane elastomers based on well‐defined prepolymers

Phase structure and thermal stability of crosslinked polyurethane elastomers based on well‐defined prepolymers

Mechanical and interfacial properties of compatibilized polyurethane blends

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