Mechanical reinforcement and memory effect of strain-induced soft segment crystals in thermoplastic polyurethane-urea elastomers

Candau, Nicolas; Stoclet, Grégory; Tahon, Jean-François; Demongeot, Adrien; Yılgör, Emel; Jonáš, Alexandr; Menceloǵlu, Yusuf́ Z.; Oğuz, Oğuzhan

doi:10.1016/j.polymer.2021.123708

Cited by 29 publications

(33 citation statements)

References 83 publications

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“…A-blocks most often refer to apolar "soft" segments (SSs) made of a low-T g polymer such as polybutadiene (PB), [2][3][4] polyisoprene (PI), [5][6][7][8][9] polyethylene oxide (PEO), 10,11 polyethylene (PE), 12,13 polypropylene (PP), 14 polydimethylsiloxane (PDMS), 15,16 poly-1-octene, 17 or the popular polytetrahydrofuran (PTHF), [18][19][20][21][22][23][24][25][26][27][28] providing the material with its flexibility. While some of the aforementioned SS have the possibility to crystallize (e.g., above 2 kg mol À1 for PTHF), they are mostly amorphous at service temperature and at rest.…”

Section: Introductionmentioning

confidence: 99%

Recent advances on the structure–properties relationship of multiblock copolymers

Baeza

2021

Journal of Polymer Science

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Multiblock copolymers represent a fascinating class of materials that sits at the very heart of industrial applications and fundamental polymer science. They are most often made of a linear succession of incompatible “soft” and “hard” segments that microphase separate at room temperature while they can be easily re‐homogenized upon heating. This thermoreversible character provides them with decisive advantages with respect to other rubber‐based materials such as vulcanized elastomers, making them indispensable for the development of a more sustainable polymer industry. Beyond practical opportunities, tailoring the multiblock copolymers morphology has a pivotal role to play in the fundamental understanding of the structure–properties relationship of polymer‐based systems. It notably serves to comprehend complex materials such as semicrystalline homopolymers and nanocomposites. Aside from the thorough work developed on well‐defined diblock copolymers for half a century, this article review aims to guide the reader into the more intricate world of multiblock copolymers by providing him/her quantitative tools to connect chemical nature, microstructure and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Recent advances on the structure–properties relationship of multiblock copolymers

Baeza

2021

Journal of Polymer Science

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“…Bisurea segmented copolymers are also known for excellent bonding between single layers, meaning that physical crosslinks re-assemble after breaking. [17,41] At the MEW processing temperature, the bisurea segments disaggregate and reform during fiber formation upon cooling, acting as physical crosslinks throughout the polymer network. It is therefore expected that layers will strongly bond together at intersection points.…”

Section: Inter-layer Bonding Testmentioning

confidence: 99%

“…It is well-known that the chemical structure, average molecular weight, polarity, and volume fraction of the different segments strongly influence the morphology of a copolymer. [40,41] Therefore, atomic force microscopy (AFM) was used to investigate surface properties for the four different copolymers. AFM analysis suggests that the ratio between the different copolymer components influences the topography of the fiber surface (Figure 5).…”

Section: Topographical Analysis Of Fiber Surfacesmentioning

confidence: 99%

Melt Electrowriting of Amphiphilic Physically Crosslinked Segmented Copolymers

Bakırcı

Frank

Gumbel

et al. 2021

Macro Chemistry & Physics

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Various (AB)n and (ABAC)n segmented copolymers with hydrophilic and hydrophobic segments are processed via melt electrowriting (MEW). Two different (AB)n segmented copolymers composed of bisurea segments and hydrophobic poly(dimethyl siloxane) (PDMS) or hydrophilic poly(propylene oxide)‐poly(ethylene oxide)‐poly(propylene oxide) (PPO‐PEG‐PPO) segments, while the amphiphilic (ABAC)n segmented copolymers consist of bisurea segments in the combination of hydrophobic PDMS segments and hydrophilic PPO‐PEG‐PPO segments with different ratios, are explored. All copolymer compositions are processed using the same conditions, including nozzle temperature, applied voltage, and collector distance, while changes in applied pressure and collector speed altered the fiber diameter in the range of 7 and 60 µm. All copolymers showed excellent processability with MEW, well‐controlled fiber stacking, and inter‐layer bonding. Notably, the surfaces of all four copolymer fibers are very smooth when visualized using scanning electron microscopy. However, the fibers show different roughness demonstrated with atomic force microscopy. The non‐cytotoxic copolymers increased L929 fibroblast attachment with increasing PDMS content while the different copolymer compositions result in a spectrum of physical properties.

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“…Thermoplastic polyurethane (TPU) is a linear polymer with excellent mechanical properties, good solvent resistance, higher durability and excellent fatigue resistance 1–5 . However, TPU also has certain shortcomings, which are poor high‐ and low‐temperature performance, poor heat resistance, low‐flame retardant grade and intense dripping 6–9 .…”

Section: Introductionmentioning

confidence: 99%

A method to essentially increase the compatibility of thermoplastic polyurethane/methyl vinyl silicone rubber based thermoplastic vulcanizate

Cui

Pan

Shi

et al. 2022

J of Applied Polymer Sci

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To simplify the production process of thermoplastic polyurethane (TPU)/methyl vinyl silicone rubber (VMQ)-based thermoplastic vulcanizate (TPV), a series of block TPUs with different hydroxybutanyl terminated polydimethylsiloxane (PDMS) content were used as the matrix to increase the essential compatibility. The impact of microstructure and macroscopic properties was explored. PMDS promoted the microphase separation of TPU, which increased the essential compatibility in TPVs. The essential compatibilization effect of PDMS made the tensile strength retention proportion of TPV relative to the raw material TPU at 40%, but the elongation at break could reach 192%, which had an excellent toughening effect. Moreover, PDMS made the limiting oxygen index of TPV-323 reach 27%.The analysis of the carbon layer proved that the Si element formed a silicon oxycarbon layer with excellent flame retardancy on the surface.

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Mechanical reinforcement and memory effect of strain-induced soft segment crystals in thermoplastic polyurethane-urea elastomers

Cited by 29 publications

References 83 publications

Recent advances on the structure–properties relationship of multiblock copolymers

Recent advances on the structure–properties relationship of multiblock copolymers

Melt Electrowriting of Amphiphilic Physically Crosslinked Segmented Copolymers

A method to essentially increase the compatibility of thermoplastic polyurethane/methyl vinyl silicone rubber based thermoplastic vulcanizate

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