Influence of Rigid Segment Type on Copoly(ether-ester) Properties

Walkowiak, Konrad; Irska, Izabela; Zubkiewicz, Agata; Rozwadowski, Zbigniew; Paszkiewicz, Sandra

doi:10.3390/ma14164614

Cited by 12 publications

(7 citation statements)

References 29 publications

(54 reference statements)

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“…It has been reported that the C–O bond is weaker than C–C bond, resulting in lower stress at break under deformation in PPDL . The polar nature of the functional groups, molar mass, and degrees of crystallinity can also affect the materials’ strength. − These multiple competing effects may have influenced the ultimate strength of the materials, and further investigations are necessary to comprehensively understand this behavior.…”

Section: Resultsmentioning

confidence: 99%

Chemically Recyclable Linear and Branched Polyethylenes Synthesized from Stoichiometrically Self-Balanced Telechelic Polyethylenes

Jang,

Nguyen,

Hillmyer

2024

J. Am. Chem. Soc.

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High-density polyethylene (HDPE) is a widely used commercial plastic due to its excellent mechanical properties, chemical resistance, and water vapor barrier properties. However, less than 10% of HDPE is mechanically recycled, and the chemical recycling of HDPE is challenging due to the inherent strength of the carbon−carbon backbone bonds. Here, we report chemically recyclable linear and branched HDPE with sparse backbone ester groups synthesized from the transesterification of telechelic polyethylene macromonomers. Stoichiometrically self-balanced telechelic polyethylenes underwent transesterification polymerization to produce the PE-ester samples with high number-average molar masses of up to 111 kg/mol. Moreover, the transesterification polymerization of the telechelic polyethylenes and the multifunctional diethyl 5-(hydroxymethyl)isophthalate generated branched PE-esters. Thermal and mechanical properties of the PE-esters were comparable to those of commercial HDPE and tunable through control of the ester content in the backbone. In addition, branched PE-esters showed higher levels of melt strain hardening compared with linear versions. The PE-ester was depolymerized into telechelic macromonomers through straightforward methanolysis, and the resulting macromonomers could be effectively repolymerized to generate a high molar mass recycled PE-ester sample. This is a new and promising method for synthesizing and recycling high-molar-mass linear and branched PE-esters, which are competitive with HDPE and have easily tailorable properties.

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Section: Resultsmentioning

confidence: 99%

Chemically Recyclable Linear and Branched Polyethylenes Synthesized from Stoichiometrically Self-Balanced Telechelic Polyethylenes

Jang,

Nguyen,

Hillmyer

2024

J. Am. Chem. Soc.

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“…The copolymers with higher flexible segment content do not display yield point, due to the initiation of highly elastic deformations at low deformation, which was also observed in the authors' previous works. 62 The Young's modulus decreases significantly, and PHF-b-F-pTHF2000 25/75 has around 46 times the lower value of the Young's modulus compared to PHF. Furthermore, the stress at the break value of PHF-b-F-pTHF2000 25/75 is about 14 MPa lower than the stress at the break value of PHF-b-F-pTHF2000 75/25.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

Influence of flexible segment length on the phase structure and properties of poly(hexamethylene 2,5‐furandicarboxylate)‐block‐biopolytetrahydrofuran copolymers

Paszkiewicz,

Walkowiak,

Irska

et al. 2024

J of Applied Polymer Sci

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Two series of biobased poly(ether‐ester)s comprised of poly(hexamethylene 2,5‐furandicarboxylate) (PHF) as the rigid segments and biopolytetrahydrofuran (pTHF) with different molecular masses (1000 and 2000 g/mol) as the flexible segments were synthesized employing polycondensation in the molten state. The study mainly focuses on comparing these two series in terms of the length of the flexible segment. The content of pTHF segments in the copolymer chains varied from 25 to 75 wt.%. The molecular structure and composition, phase structure, and thermal and mechanical properties were characterized by nuclear magnetic resonance (1H NMR) and Fourier‐transformed infrared (FTIR) spectroscopies, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and positron annihilation lifetime spectroscopy (PALS). In addition, mechanical performance and thermo‐oxidative and thermal stability have been investigated. Moreover, cyclic tensile properties were studied to evaluate the elastic properties. 1H NMR and FTIR spectroscopies demonstrate that the syntheses were correctly carried out, which made it possible to obtain the desired compositions of the block copolymers with high molecular masses. The decrease in Tm1, Tc1, and XcPHF values was visible, along with the increase in the flexible segment content. Moreover, the characteristic properties measured by PALS and the values of temperatures designated from TGA (inert and oxidizing atmosphere) did not vary between copolymer series PHF‐b‐F‐pTHF1000 and PHF‐b‐F‐pTHF2000. In turn, along with an increase in flexible segment content and the length of the pTHF, the values of tensile modulus, stress at break, and hardness decrease, while the value of elongation at break increases.

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“…Thermoplastic elastomers (TPEs) are a class of materials that combine the mechanical properties of elastomers and the processing properties of thermoplastics. [ 11 ] This is because of their morphology, which can be divided into rigid and flexible segments. Compared to traditional elastomers, the rigid TPE segment forms physical crosslinking instead of chemical crosslinking.…”

Section: Introductionmentioning

confidence: 99%

Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

et al. 2023

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For several decades, polymer nanocomposites (PNCs) have received the interest of the scientific community and industry. [1,2] PNCs can be described as a system consisting of two or more phases, with one or more dispersed phases in the nanoscale within the polymer matrix phase. [3,4] It is possible to improve the thermal, mechanical, barrier, electrical, and biological properties of a polymer matrix with a small addition of a nanofiller. Several factors affect the improvement in properties: the particle size, the degree of surface development, and the distribution of nanoparticles in the polymer matrix. [5] Carbon-based Nanomaterials can be classified according to the number of dimensions they display on the nanoscale: 1D fibers such as carbon nanofibers (CNFs); 2D platelets, for example, graphene and layered silicate; and 3D particles like spherical silica, semiconductor nanoclusters, and quantum dots. [6][7][8] CNFs have excellent mechanical, thermal, and electrical properties. The tensile strength and Young's modulus of CNF are in the range of 1.5-7 and 228-724 GPa, respectively. [9] The range of these values varies depending on processing methods and fiber diameter. The graphene nanoplatelets (GNPs) are 2D carbon-based nanoparticles with a plate-like shape. Adding GNPs to a polymer matrix generally increases the value of barrier properties, thermal conductivity, and mechanical properties. The value of Young's modulus was reported to be 1.1 TPa, and the tensile strength was 125 GPa for GNPs. [10] Moreover, hybrid polymer composites are growing in popularity in the scientific community. These composites are obtained by adding at least two nanofillers to the polymeric matrix, which can achieve a synergistic effect that improves thermal, mechanical, barrier, and electrical properties.However, it is not only the type of nanoparticles that determines the properties of PNCs, but also the polymer matrix. Thermoplastic elastomers (TPEs) are a class of materials that combine the mechanical properties of elastomers and the processing properties of thermoplastics. [11] This is because of their morphology, which can be divided into rigid and flexible segments. Compared to traditional elastomers, the rigid TPE segment forms physical crosslinking instead of chemical

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Influence of Rigid Segment Type on Copoly(ether-ester) Properties

Cited by 12 publications

References 29 publications

Chemically Recyclable Linear and Branched Polyethylenes Synthesized from Stoichiometrically Self-Balanced Telechelic Polyethylenes

Chemically Recyclable Linear and Branched Polyethylenes Synthesized from Stoichiometrically Self-Balanced Telechelic Polyethylenes

Influence of flexible segment length on the phase structure and properties of poly(hexamethylene 2,5‐furandicarboxylate)‐block‐biopolytetrahydrofuran copolymers

Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

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