Tuning chain extender structure to prepare high-performance thermoplastic polyurethane elastomers

Xu, Wei; Wang, Jianjun; Zhang, Shi Yu; Sun, Jun; Qin, Chuan; Dai, Li

doi:10.1039/c8ra02784f

Cited by 19 publications

(16 citation statements)

References 55 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 10 ] It is also important to note that macromolecules containing ferrocene groups are a class of metallopolymers with emerging applications given their electrochemical, electronic, optoelectronic, biological and catalytic properties. [ 11–13 ] On the other hand, depending on the application, an aliphatic or aromatic isocyanate must be selected to complement the HTPB and/or Butacene in the formation of a PU network to provide the desired suite of properties. Particularly, aliphatic diisocyanates are preferred for some coating applications given the resistance to abrasion and degradation by ultraviolet light; furthermore, 1,6‐hexamethylene diisocyanate (HMDI) is claimed to be a nontoxic amine producer during degradation of the corresponding PUs.…”

Section: Introductionmentioning

confidence: 99%

Chemorheology and Kinetics of High‐Performance Polyurethane Binders Based on HMDI

Lucio

Fuente

2021

Macro Materials & Eng

View full text Add to dashboard Cite

Aliphatic diisocyanates, such as 1,6‐hexamethylene diisocyanate (HMDI), are preferred curing agents for the formation of polyurethanes (PUs) in applications where resistance to abrasion or degradation by ultraviolet light takes precedence. Aside from the final properties, the curing agent plays a key role in the bulk manufacturing of such materials, and it mainly affects the polymerization kinetics and their rheology. The copolymerization of HMDI and a metallo‐prepolymer derivative from hydroxyl‐terminated polybutadiene (HTPB) is studied under isothermal conditions (50–80 °C). This study is carried out by means of an indirect method, using both rotational viscometry and dynamic rheometry. At the beginning of the process, the viscosity growth fit well to a first‐order kinetic model. Afterward, the reactive system passes through gelation, from which only rheology is allowed for the investigation of the entire polymerization process. This transition is analyzed in depth together with predictions from percolation theory. The conversion degree is determined from rheological measurements, and then an autocatalytic kinetic model is applied to describe the overall process. Finally, an isoconversional method allows the evolution of activation energy to be studied. This analysis merits attention for the development of high‐performance binders that are of great interest in aerospace propulsion technology.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemorheology and Kinetics of High‐Performance Polyurethane Binders Based on HMDI

Lucio

Fuente

2021

Macro Materials & Eng

View full text Add to dashboard Cite

show abstract

“…The hard segments (HS) of TPU are typically derived from diisocyanates and small molecule chain extenders (such as diamines or diols), which endow them with good mechanical strength [4,5], whereas the soft segments (SS) are formed by oligomeric diols and provide them flexibility and elastic behavior [6][7][8]. Therefore, the material properties can be customized by controlling the ratio of soft and hard segments and structural morphologies [9][10][11], which enable their unique performance, such as excellent wear resistance, high tensile strength, good chemical resistance, and machinability [12,13]. In recent years, TPU play an increasingly important role in many industrial fields, especially in the extensive applications of replacing traditional thermoset elastomers.…”

Section: Introductionmentioning

confidence: 99%

Research of TPU Materials for 3D Printing Aiming at Non-Pneumatic Tires by FDM Method

et al. 2020

View full text Add to dashboard Cite

3D printing technology has been widely used in various fields, such as biomedicine, clothing design, and aerospace, due to its personalized customization, rapid prototyping of complex structures, and low cost. However, the application of 3D printing technology in the field of non-pneumatic tires has not been systematically studied. In this study, we evaluated the application of potential thermoplastic polyurethanes (TPU) materials based on FDM technology in the field of non-pneumatic tires. First, the printing process of TPU material based on fused deposition modeling (FDM) technology was studied through tensile testing and SEM observation. The results show that the optimal 3D printing temperature of the selected TPU material is 210 °C. FDM technology was successfully applied to 3D printed non-pneumatic tires based on TPU material. The study showed that the three-dimensional stiffness of 3D printed non-pneumatic tires is basically 50% of that obtained by simulation. To guarantee the prediction of the performance of 3D printed non-pneumatic tires, we suggest that the performance of these materials should be moderately reduced during the structural design for performance simulation.

show abstract

“…The significant finding of this current work was depicting the role diisocyanate symmetry played in the stage of development of microphase separated morphology and the resultant new mechanical properties of the PU [5]. The method deemed to be best to improve the PUs' mechanical properties is the chemical linking of the PU chain with functionalized dendritic polymers through crosslinking [72]. Energy recovery and mechanical, chemical, and thermochemical recycling were some of the ways identified for recycling PU [73].…”

Section: Mechanical Properties Of Nanofiller-tpu Nanocompositesmentioning

confidence: 94%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Tuning chain extender structure to prepare high-performance thermoplastic polyurethane elastomers

Cited by 19 publications

References 55 publications

Chemorheology and Kinetics of High‐Performance Polyurethane Binders Based on HMDI

Chemorheology and Kinetics of High‐Performance Polyurethane Binders Based on HMDI

Research of TPU Materials for 3D Printing Aiming at Non-Pneumatic Tires by FDM Method

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

Contact Info

Product

Resources

About