The effect of mixed soft segment on the microstructure of thermoplastic polyurethane

2021 ◽  
pp. 51346
Author(s):  
Yongyin Cui ◽  
Hairui Wang ◽  
Hongwei Pan ◽  
Tongtong Yan ◽  
Chengzhong Zong
Keyword(s):  
Soft Segment ◽  
Thermoplastic Polyurethane

scholarly journals Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2467
Author(s):  
Tyser Allami ◽  
Ahmed Alamiery ◽  
Mohamed H. Nassir ◽  
Amir H. Kadhum
Keyword(s):  
Thermal Stability ◽  
Electrical Properties ◽  
Hard Segment ◽  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Tensile Modulus ◽  
Scanning Calorimetry ◽  
Strain Behavior ◽  
Phase Separation Kinetics ◽  
Thermal Stability Of

The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.

scholarly journals Control of Mechanical Properties of Thermoplastic Polyurethane Elastomers by Restriction of Crystallization of Soft Segment

Materials ◽  
2010 ◽  
Vol 3 (12) ◽  
pp. 5097-5110 ◽  
Author(s):  
Ken Kojio ◽  
Mutsuhisa Furukawa ◽  
Yoshiteru Nonaka ◽  
Sadaharu Nakamura
Keyword(s):  
Mechanical Properties ◽  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Polyurethane Elastomers ◽  
Thermoplastic Polyurethane Elastomers

Shape-Memory Bionanocomposites Based on Chitin Nanocrystals and Thermoplastic Polyurethane with a Highly Crystalline Soft Segment

2013 ◽  
Vol 14 (12) ◽  
pp. 4475-4482 ◽  
Author(s):  
Ainara Saralegi ◽  
Susana C. M. Fernandes ◽  
Ana Alonso-Varona ◽  
Teodoro Palomares ◽  
E. Johan Foster ◽  
...  
Keyword(s):  
Shape Memory ◽  
Soft Segment ◽  
Thermoplastic Polyurethane

scholarly journals Fabrication and Properties of a Bio-Based Biodegradable Thermoplastic Polyurethane Elastomer

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1121
Author(s):  
Zhaoshan Wang ◽  
Jieqiong Yan ◽  
Tongyao Wang ◽  
Yingying Zai ◽  
Liyan Qiu ◽  
...  
Keyword(s):  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Average Molecular Weight ◽  
Sebacic Acid ◽  
Polyurethane Elastomer ◽  
Two Phase ◽  
Elongation At Break ◽  
Atomic Force ◽  
Melt Polycondensation ◽  
Thermoplastic Polyurethane Elastomer

Using the melt polycondensation of five bio-based aliphatic monomers (succinic acid, sebacic acid, fumaric acid, 1,3-propanediol, and 1,4-butanediol), we first synthesized the more flexible and biodegradable polyester diols (BPD) with an average molecular weight of 3825. Then, the BPD was polymerized with excessive 4,4′-diphenylmethane diisocyanate (MDI). Finally, the molecular chain extender of 1,4-butanediol (BDO) was used to fabricate the biodegradable thermoplastic polyurethane elastomer (BTPU), comprising the soft segment of BPD and the hard segment polymerized by MDI and BDO. Atomic force microscope (AFM) images showed the two-phase structure of the BTPU. The tensile strength of the BTPU containing 60% BPD was about 30 MPa and elongation at break of the BTPU was over 800%. Notably, the BTPU had superior biodegradability in lipase solution and the biodegradation weight loss ratio of the BTPU containing 80% BPD reached 36.7% within 14 days in the lipase solution.

Effect of soft segment molecular weight and NCO:OH ratio on thermomechanical properties of lignin-based thermoplastic polyurethane adhesive

2020 ◽  
Vol 131 ◽  
pp. 109690 ◽  
Author(s):  
Julia Rocha Gouveia ◽  
Rogério Ramos de Sousa Júnior ◽  
Anderson Orzari Ribeiro ◽  
Sergio Adriano Saraiva ◽  
Demetrio Jackson dos Santos
Keyword(s):  
Molecular Weight ◽  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Thermomechanical Properties ◽  
Polyurethane Adhesive

scholarly journals Mechanoresponsive Elastomers Made with Excimer-Forming Telechelics

2020 ◽  
Vol 02 (04) ◽  
pp. 313-322
Author(s):  
Derek J. Kiebala ◽  
Zhiyuan Fan ◽  
Celine Calvino ◽  
Lauren Fehlmann ◽  
Stephen Schrettl ◽  
...  
Keyword(s):  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Weight Fraction ◽  
Relaxation Processes ◽  
High Concentration ◽  
Polyurethane Elastomers ◽  
Optical Signals ◽  
Emission Color ◽  
Fluorescence Color ◽  
Thermoplastic Polyurethane Elastomers

Mechanoresponsive luminescent (MRL) elastomers, which change their fluorescence color or intensity upon deformation, can facilitate simple strain detection through optical signals. Several polymers have been endowed with MRL properties by blending them with excimer-forming dyes, whose assembly and emission color are affected by deformation of the blended materials. However, access to elastic MRL polyurethanes based on this approach has proven difficult and usually requires the covalent incorporation of such dyes in high concentration. Here, we show that much simpler access to MRL elastomers is possible by blending thermoplastic polyurethane elastomers with a small weight fraction of a telechelic sensor macromolecule carrying two excimer-forming oligo(p-phenylene vinylene) dyes at the termini. While the mechanical properties of the two polyurethanes, which were selected because of their dissimilar mechanical behaviors, remain unchanged, the additive imparts these materials with MRL characteristics. Notably, the reliable and reversible detection of strains as low as 5% is possible. The highly sensitive mechanochromic response mirrors the deformation and relaxation processes occurring in these model polyurethanes and enabled a detailed analysis of the processes underlying the shape-memory properties in one of the polyurethanes, in which such behavior was imparted by a crystallizable soft segment.

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