High-performance liquid-crystalline polymer films for monolithic “composites”

Schaller, Raphael; Peijs, Ton; Tervoort, Theo A.

doi:10.1016/j.compositesa.2015.11.024

Cited by 14 publications

(10 citation statements)

References 34 publications

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“…In recent years, a new class of “all‐polymer” or “self‐reinforced polymer” composites, which are based on similar or identical materials for both matrix and reinforcement have drawn a lot of interest in both academia and industry due to their advantages in terms of processing, interfacial properties and recyclability. Studies have been carried out on the preparation and characterization of these composites based on a variety of polymers including: polyethylene (PE) , polypropylene (PP) , poly(ethylene terephthalate) (PET) , cellulose , and liquid‐crystalline copolyesters .…”

Section: Introductionmentioning

confidence: 99%

All‐aramid composites by partial fiber dissolution in mixed solvents

Zhang¹,

Cortes-Ballesteros

Peijs

2017

Polymer Composites

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A new self-reinforced polymer composite based on highperformance aramid fibers was successfully prepared by applying an elaborately designed surface-dissolution method to fuse poly(p-phenylene terephthalamide) (PPTA) fibers and consolidate them into "all-aramid" composites. A mixture of phosphoric acid (H 3 PO 4 ) and sulfuric acid (H 2 SO 4 ) was selected as a milder alternative to highly concentrated sulfuric acid which was used in our previous study. This milder solvent requires longer immersion times to partially dissolve PPTA fiber surfaces, therefore a more controllable consolidation process to create allaramid composites. After selection of the optimal H 3 PO 4 / H 2 SO 4 concentration, PPTA fibers were immersed in the mixed solvent for selected periods of time to partially dissolve PPTA fiber surfaces and convert them into the matrix phase which is needed to fuse the remaining PPTA fiber cores together. Following extraction of the mixed solvent and drying, a consolidated all-aramid composite was formed. The structure, mechanical-, and thermal properties of these all-aramid composites were investigated and reported. Based on high temperature performance of aramid fiber, these all-aramid composites are promising candidates for high temperature applications. POLYM. COMPOS., 00:000-000, 2017.

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Section: Introductionmentioning

confidence: 99%

All‐aramid composites by partial fiber dissolution in mixed solvents

Zhang¹,

Cortes-Ballesteros

Peijs

2017

Polymer Composites

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“…Besides competitive mechanical properties, notably toughness and impact strength, these materials have added end-of-life benefits since, upon recycling and remelting, a polymer blend is obtained which can be reused to make again SRPs, or alternatively, be used for other polymer applications. SRP concepts have been proposed for a wide range of polymer systems including polypropylene (PP) [6][7][8], poly(ethylene terephthalate) (PET) [9][10][11], polyethylene (PE) [12,13], polylactic acid (PLA) [14,15], liquid crystal polymer (LCP) [16], aramid [17] and cellulose [18,19].…”

Section: Introductionmentioning

confidence: 99%

Self-Reinforced Polypropylene Composites based on Discontinuous Tapes - An Experimental and Numerical Study of the Influence of Tape Length

et al. 2020

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The creation of highly oriented, coextruded polypropylene (PP) tapes allows the production of recyclable self-reinforced polypropylene (SRPP) or all-PP composites, with a large temperature processing window and high volume reinforcement content ($$\sim$$ ∼ 90%). The objective of this research is to assess the performance potential of SRPP composites based on discontinuous or short tapes. For this, the critical tape length for effective mechanical reinforcement of aligned discontinuous PP tapes was determined, while the stress transfer from PP matrix to PP tape was investigated in single tape model composites in combination with an optical strain mapping technique. Mechanical behaviour of both single tape as well as aligned tape model composites was evaluated using finite element analysis (FEA) and used to predict the properties of randomly oriented short tape composites. These discontinuous tape SRPP composites may be of interest from a manufacturing as well as recycling point of view. In terms of manufacturing, such systems are of interest as they may show improved formability during stamping or compression moulding operations while from a recycling point of view it would allow the re-use of production waste like cuttings of fabrics or tapes.

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“…Thermotropic liquid crystal polymers (TLCPs), which contain a special monomer chemical structure, are already widely used as high-performance commercial engineering polymers owing to their good thermal properties, high strength, high modulus, low viscosity, and other excellent mechanical properties [1,2]. Many studies have correlated the structures of TLCPs with their characteristics [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Physical Properties and Molecular Dynamics of Thermotropic Liquid Crystalline Copolyesters on p-Hydroxybenzoic Acid Content

et al. 2020

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Two series of thermotropic liquid crystal copolymers (TLCPs) with different monomer structures and compositions were synthesized. The copolymers in the first series consisted of 2,5-diethoxyterephthalic acid (ETA), hydroquinone (HQ), and p-hydroxybenzoic acid (HBA), whereas those in the second series contained ETA, 2,7-dihydroxynaphthalene (DHN), and HBA. In both series, the molar ratio of HBA to the other monomers varied from 0 to 5. The thermal properties, degree of crystallinity, and stability of the liquid crystalline mesophase of the copolymers obtained at each HBA ratio were evaluated and compared. Overall, at each HBA content, the DHN-containing copolymer had better thermal properties, but the HQ-containing copolymer exhibited a higher degree of crystallinity and a more stable liquid crystalline mesophase. Furthermore, similar thermal stabilities were observed in both series. The dependence of the molecular dynamics of the TLCPs on the monomer structure was explained using 13C magic-angle spinning/cross-polarization nuclear magnetic resonance spectroscopy. An in-depth investigation of the relaxation time of each carbon revealed that the molecular motions of the TLCPs were greatly influenced by the structures of the monomers present in the main chain. The molecular dynamics of the HQ and DHN monomers in the two series were evaluated and compared.

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High-performance liquid-crystalline polymer films for monolithic “composites”

Cited by 14 publications

References 34 publications

All‐aramid composites by partial fiber dissolution in mixed solvents

All‐aramid composites by partial fiber dissolution in mixed solvents

Self-Reinforced Polypropylene Composites based on Discontinuous Tapes - An Experimental and Numerical Study of the Influence of Tape Length

Dependence of the Physical Properties and Molecular Dynamics of Thermotropic Liquid Crystalline Copolyesters on p-Hydroxybenzoic Acid Content

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