Enhanced toughness of hydroxyapatite–poly(ethylene terephthalate) composites by immersion in water

Okuda, Kohei; Hirota, Ken; Mizutani, Tadashi; Numamoto, Yusuke

doi:10.1039/d1ma00512j

Cited by 6 publications

(6 citation statements)

References 67 publications

(101 reference statements)

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“…Coprecipitation can be accomplished in one pot and in a large scale. Both water-soluble polymers , and amphiphilic polymers can be used for hybridization with coprecipitation. For instance, collagen, , chitosan, − starch, , cellulose derivatives, , poly(vinyl alcohol), , and polyacrylic acid , have been employed to hybridize with HAP.…”

Section: Introductionmentioning

confidence: 99%

In Situ Crystallization of Hydroxyapatite on Carboxymethyl Cellulose as a Biomimetic Approach to Biomass-Derived Composite Materials

et al. 2022

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Nanohydroxyapatite (HAP) was crystallized in an aqueous solution of carboxymethyl cellulose (CMC) to prepare the composites of CMC and HAP with a stable interface between them with the aim of developing a sustainable tough biomass composite material inspired by bone. The temperature (room temperature to 90 °C) and the concentration of CMC (0.83–13.2 g/L) were optimized for the mechanical properties of the composites. The composite containing 67 wt % HAP prepared at 50 °C in the presence of 9.9 g/L CMC exhibited the largest flexural strength of 113 ± 2 MPa and the elastic modulus of 7.7 ± 0.3 GPa. X-ray diffraction showed that nanometer-sized HAP crystals were formed with a large aspect ratio, and energy-dispersive X-ray spectroscopy and infrared spectroscopy revealed that CMC was bound to the surface of HAP through an ionic interaction between Ca 2+ and COO – . Since the composite has a higher flexural strength than polyamide 6 (92 MPa) and a higher elastic modulus than polyamide 6 with 40 wt % glass fiber (5.5 GPa), it can be used as new tough biomass composite material to replace petroleum-derived engineering plastics.

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Section: Introductionmentioning

confidence: 99%

In Situ Crystallization of Hydroxyapatite on Carboxymethyl Cellulose as a Biomimetic Approach to Biomass-Derived Composite Materials

et al. 2022

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“…Bending vibrations for PO 4 −3 groups appeared near 560 cm −1 and 602 cm −1 and similar spectra were noticed for all the gamma-irradiated HAp samples. 31 For the normal mode of ν 1 and ν 3 vibrations of the phosphate group, the most intense peak was visualized at the fingerprint region which is at the 1026 cm −1 wavenumber along with two accompanying peaks at 962 and 1095 cm −1 . The triple degenerate of ν 3 asymmetric stretching due to the phosphate group was noticed at the wavenumbers of 1026 and 1085 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

Modification of the crystallographic parameters in a biomaterial employing a series of gamma radiation doses

Hossain

Shaikh

Rahaman

et al. 2022

Mol. Syst. Des. Eng.

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“…Larger water absorption of Composite 2 carboxylates than that of Composite 1 carboxylates can be attributed to a larger pore volume of the composites having a larger inorganic volume fraction. 26 On the other hand, Composite 2 laurates showed similar water absorption to that of Composite 1 laurates when acylation temperature was higher than 100 °C (Figure S3). Flexible alkyl chains of laurate can fill the pore in the composite to prevent water penetration.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The values of water absorption Δ w / w (%) of Composite 2 acetate and Composite 2 benzoate were larger than those of the corresponding Composite 1. Larger water absorption of Composite 2 carboxylates than that of Composite 1 carboxylates can be attributed to a larger pore volume of the composites having a larger inorganic volume fraction . On the other hand, Composite 2 laurates showed similar water absorption to that of Composite 1 laurates when acylation temperature was higher than 100 °C (Figure S3).…”

Section: Resultsmentioning

confidence: 99%

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Effects of Hydration on Mechanical Properties of Acylated Hydroxyapatite–Starch Composites

Okuda

Aoyama²,

Hirota

et al. 2022

ACS Appl. Polym. Mater.

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Transesterification of vinyl acetate, vinyl benzoate, and vinyl laurate with hydroxyapatite−starch composites was carried out in dimethyl sulfoxide at 25−120 °C for 8 h. The composites of acylated starch and hydroxyapatite were compressed by hot pressing at 60 °C or 120 °C at 120 MPa to obtain the compacts. The three-point bending test of the compressed compacts revealed that acetylation and benzoylation did not alter the mechanical properties of the composites much, while lauroylation softened the composites. Bending elastic moduli of the acetylated and benzoylated composites were 2−3 GPa, whereas those of the lauroylated composites were 0.1−0.3 GPa. Both hydroxyapatite−starch compacts and their acetylated ones readily collapsed in the bending test after immersion in water, while the benzoylated and lauroylated composite compacts were water-resistant. The bending strengths of the compacts of benzoylated and lauroylated composites after immersion in water were ca. 60−75% of those of the pristine compacts. The stain at break of the lauroylated composites after immersion in water was 1.1−1.75 times larger than that of the as-prepared onestrends similar to natural bone.

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Enhanced toughness of hydroxyapatite–poly(ethylene terephthalate) composites by immersion in water

Abstract: Water-soluble poly(ethylene terephthalate) bearing carboxylate groups on 14-22% of the phenylene moieties was coprecipitated with calcium ion and phosphate ion in water at room temperature, 70 oC, and 90 oC...

Cited by 6 publications

References 67 publications

In Situ Crystallization of Hydroxyapatite on Carboxymethyl Cellulose as a Biomimetic Approach to Biomass-Derived Composite Materials

In Situ Crystallization of Hydroxyapatite on Carboxymethyl Cellulose as a Biomimetic Approach to Biomass-Derived Composite Materials

Modification of the crystallographic parameters in a biomaterial employing a series of gamma radiation doses

Effects of Hydration on Mechanical Properties of Acylated Hydroxyapatite–Starch Composites

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