Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

Ansari, Manauwar Ali; Somdee, Patcharapon; Marossy, Kálmán

doi:10.1007/s10965-021-02538-6

Cited by 10 publications

(9 citation statements)

References 54 publications

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“…Both observed effects due to the addition of acid and COOH-functionalized MWCNTs could be attributed to the elimination of the foaming phenomenon in the BPC. Data obtained here are in agreement with the findings of other researchers [2,55] that reported how the introduction of a small dosage of a strong acid, such as HCL, prohibited the formation of PU; while the implementation of a weaker acid, such as acetic acid and benzoic acid, has a less pronounced inhibiting effect. Notwithstanding, the addition of COOH-functionalized MWCNTs not only promoted the crosslinking density of the PU specimen containing acid but also led to more crystallinity in the sample.…”

Section: Microstructural Chemical and Carbon Footprint Analysissupporting

confidence: 92%

“…The isocyanate used was solvent-free, medium-viscosity polymethylene polyphenyl polyisocyanate, Lupranate M70L (BASF, Wyandotte, MI, USA) with NCO content of 31.0 wt.%. Several trial mixes were designed and tested to identify, examine and overcome the challenges of producing BPC, including excessive foaming, fast setting, and zero flowability, as depicted in Figure 1a-c It was suggested that when the mix acidity is increased, foam formation can be stopped due to the blockage of the active -NCO sites of polyisocyanate [2]. It was also shown that acids with the 𝑝𝐾 𝑎 in the range of 2.8-4.5 will retard rather than prohibiting the polymerization of PU [34].…”

Section: Materials and MIX Designmentioning

confidence: 99%

“…Table 1 presents the main characteristics of MWCNTs in this research. It was suggested that when the mix acidity is increased, foam formation can be stopped due to the blockage of the active -NCO sites of polyisocyanate [2]. It was also shown that acids with the pK a in the range of 2.8-4.5 will retard rather than prohibiting the polymerization of PU [34].…”

Section: Materials and MIX Designmentioning

confidence: 99%

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Development and Characterization of a Sustainable Bio-Polymer Concrete with a Low Carbon Footprint

et al. 2023

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Polymer concrete (PC) has been used to replace cement concrete when harsh service conditions exist. Polymers have a high carbon footprint when considering their life cycle analysis, and with increased climate change concerns and the need to reduce greenhouse gas emission, bio-based polymers could be used as a sustainable alternative binder to produce PC. This paper examines the development and characterization of a novel bio-polymer concrete (BPC) using bio-based polyurethane used as the binder in lieu of cement, modified with benzoic acid and carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs). The mechanical performance, durability, microstructure, and chemical properties of BPC are investigated. Moreover, the effect of the addition of benzoic acid and MWCNTs on the properties of BPC is studied. The new BPC shows relatively low density, appreciable compressive strength between 20–30 MPa, good tensile strength of 4 MPa, and excellent durability resistance against aggressive environments. The new BPC has a low carbon footprint, 50% lower than ordinary Portland cement concrete, and can provide a sustainable concrete alternative in infrastructural applications.

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Section: Microstructural Chemical and Carbon Footprint Analysissupporting

confidence: 92%

Section: Materials and MIX Designmentioning

confidence: 99%

Section: Materials and MIX Designmentioning

confidence: 99%

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Development and Characterization of a Sustainable Bio-Polymer Concrete with a Low Carbon Footprint

et al. 2023

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“…Figure shows a schematic of the materials system and the generation of polarization and piezoelectricity. [ 109 ] When a compressive force is applied to these foams, the dipole moment density increases due to fixed guest dipoles, inducing a surface charge and hence current flow. The fabrication approach could be used for other materials having greatly low bulk moduli for example brush polymers.…”

Section: Types Of Polymeric Piezoelectric Foamsmentioning

confidence: 99%

Piezoelectric Polymeric Foams as Flexible Energy Harvesters: A Review

Ansari

Somdee

2022

Adv Energy and Sustain Res

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Piezoelectric energy harvesters (PEHs) have the potential to power low‐power electronic devices and can advance, self‐powered, autonomous electronics to the next level. Conventional ceramic‐based piezoelectrics have various properties such as fragility, rigidity, toxicity, high density, and lack of design flexibility which limit their use in more flexible environments. A ton of research has been carried out and published on novel piezomaterials, their transduction mechanisms, analytical models, and electrical circuits to improve various aspects of PEHs. Among these materials, studies on polymeric cellular (or foamed) ferroelectrets or piezoelectrets as PEHs have grown significantly since their discovery. Also, very limited or short reviews are available covering only few aspects. There is a necessity of recognizing their past and present advances in their various generation technology and polymer systems. Herein, a broader review of almost all conventional and recent polymeric foam‐based piezoelectrics for PEH applications is summarized. These cellular polymer piezoelectric systems either in bulk, composite, layered, or film form can be fabricated, and depending on the application and conditions, different polymers groups, mainly, polyolefins, polyester, fluoropolymer, and others, are considered. Their applications and future perspectives are also presented and discussed.

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“…Polyurethane is a type of polymer that could be manufactured and used in a wide range of applications, including elastomer, thermosetting glue, rigid polyurethane, foam, etc. [ 34 ] The formation of hard segments (HS) and soft segments (SS) in polyurethane's structure is its special aspect. Short diols and isocyanates from the hard segments, while long polyols create the soft segments.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐mechanical properties of flexible and rigid polyurethane (PU)/Cu composites

2022

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In this article, flexible and rigid polyurethane (PU)/copper (Cu) composites are prepared via a simple and cost-effective solution casting process. The filler dispersion and chemical bonding of composites are investigated by SEM and FTIR techniques. The results showed the homogeneous dispersion of Cu microparticles. Furthermore, thermal properties are investigated using DMA, DSC, and thermal conductivity measurements. The maximum improvement in thermal conductivity for flexible and rigid PU composites is 24%, and 48%, respectively, as compared to their pure counterparts. The obtained thermal conductivity values are also compared and analyzed with the mechanical property model (Corans and Patel model) and found in good agreement with the output of the model. DMA results showed enhancement in the storage modulus with filler loading while the DSC results revealed the endothermic temperature did not significantly change with adding Cu filler in both flexible and rigid PU matrices. The mechanical properties of composites were studied using tensile and hardness (Shore A and Shore D) test. For flexible PU composites an improvement in tensile strength (43%), Young's modulus (111%), Shore A hardness (6%), Shore D hardness (27%) as compared to pure flexible PU. For rigid PU composites a reduction in tensile strength (23%), Young's modulus (32%), and an increase in Shore A hardness (3%), Shore D hardness (5%) as compared to pure rigid PU. As a result of the current study, TC of rigid PU is found doubly enhanced compared to flexible PU at the same filler concentration. Copper microparticles can act as active filler in both flexible and rigid PU matrices.

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Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

Cited by 10 publications

References 54 publications

Development and Characterization of a Sustainable Bio-Polymer Concrete with a Low Carbon Footprint

Development and Characterization of a Sustainable Bio-Polymer Concrete with a Low Carbon Footprint

Piezoelectric Polymeric Foams as Flexible Energy Harvesters: A Review

Thermo‐mechanical properties of flexible and rigid polyurethane (PU)/Cu composites

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