Synthesis and characterization of chitosan modified polyurethane bio-nanocomposites with biomedical potential

Javaid, Muhammad Asif; Khera, Rasheed Ahmad; Zia, Khalid Mahmood; Saito, Kei; Bhatti, Ijaz Ahmad; Asghar, M. I.

doi:10.1016/j.ijbiomac.2018.04.013

Cited by 70 publications

(33 citation statements)

References 42 publications

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“…[22]. In the FTIR spectrum of the PU samples, the absorption band at 2249 cm −1 , associated with the stretching vibration of the valence -NCO groups, is not observed, which confirms the complete polymerization of diisocyanates at the synthesis stage [23]. Absorption bands for CH 2 asymmetric and CH 2 symmetric stretching are visible at 2930 cm −1 and 2860 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 76%

Thermal properties of polyurethane-based composites modified with chitosan for biomedical applications

Szlachta

Ordon

Nowicka

et al. 2020

J Therm Anal Calorim

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The thermal properties of chitosan and hydroxyapatite (HAp)-crosslinked polyurethanes (PU) prepared in a two-step bulk polymerization were investigated. Synthesis of PU was carried out using 1,6-hexamethylene diisocyanate, poly(ethylene glycol) 2000 and dibutyltin dilaurate as a catalyst. Various molar ratios of chitosan and 1,4-butanediol were applied, and the effects of incorporating different HAp amounts and the chitosan-to-BDO ratio were studied. It was found that the thermal properties of PU materials depend on polysaccharides and bioceramics load, which was confirmed by differential scanning calorimetry and thermogravimetry. The glass transition temperature increases with increasing chitosan fraction. Similarly, the onset temperature of degradation increased with chitosan addition. On the other hand, the presence of ceramics did not show a significant impact on the thermal properties of PU composites. Successful polymerization and chain extension of the isocyanate groups with hydroxyl moieties from chitosan and HAp were confirmed by Fourier transform infrared spectroscopy, and the morphology was examined using scanning electron microscopy.

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Section: Resultsmentioning

confidence: 76%

Thermal properties of polyurethane-based composites modified with chitosan for biomedical applications

Szlachta

Ordon

Nowicka

et al. 2020

J Therm Anal Calorim

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“…The spectrum of fBNNSs is evidently different from that of BNNSs‐OH. It is found that the absorption peak of hydroxyl disappears completely, while new absorption peaks appear at 3338 (NH) and 1724 cm −1 (CO), indicating that hydroxyls were reacted with isocyanate groups thoroughly . Moreover, the conspicuous absorption peaks at 2919 and 2848 cm −1 (CH 2 ) can be assigned to CH 2 groups in octadecyl isocyanate.…”

Section: Resultsmentioning

confidence: 96%

Novel Poly(m‐phenyleneisophthalamide) Dielectric Composites with Enhanced Thermal Conductivity and Breakdown Strength Utilizing Functionalized Boron Nitride Nanosheets

Duan

Wang

et al. 2019

Macro Materials & Eng

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Dielectric polymer‐based composites with high breakdown strengths and thermal conductivities have attracted considerable attention when applied in electronic devices. In this study, a novel poly(m‐phenyleneisophthalamide) (PMIA) dielectric nanocomposite is successfully fabricated by introducing functionalized hexagonal boron nitride nanosheet (fBNNS) fillers. Due to effective functionalization of hexagonal boron nitride nanosheets (BNNSs), fBNNSs fillers are homogeneously dispersed in the PMIA matrix. The breakdown strength and thermal conductivity of PMIA/fBNNSs dielectric nanocomposite are investigated. Research results indicate that the breakdown strength of fBNNSs‐12 reaches 105.6 MV m−1, which is 1.34 times that of pure PMIA. Moreover, owing to high thermal conductivity of fBNNSs, the thermal conductivities of fBNNSs‐12 are observably increased to 8.06 W m−1 K of in‐plane direction and 0.84 W m−1 K of through‐plane direction, respectively. Considering these properties, the manufactured PMIA/fBNNSs dielectric nanocomposites show potential applications in field of electronics.

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“…e absorption bands at 1725 and 1630 cm −1 are due to the vibration of C=O (carbonyl) groups in urethane bonds (I amide absorption band). e band at around 1585 cm −1 corresponds with N-H stretching vibration [31,32]. e bands in the 1150-950 cm −1 range from the ether C-O-C groups from PEG [33] are covered with bands related to PO 3− 4 groups from HA [34], but the bands in this range are broader than for pristine HA.…”

Section: Ftir and Xrd Analysis Of Ha-g-pegmentioning

confidence: 96%

Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

Król-Morkisz

Karaś

Majka

et al. 2019

Advances in Polymer Technology

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Nanostructured hydroxyapatite (HA) functionalized with poly(ethylene glycol) (HA-g-PEG) of different molar mass was used as a thermal stabilizer to prepare polyoxymethylene (POM) composites by a melt processing method. The chemical and crystalline structure of (HA-g-PEG) and POM/HA-g-PEG composites was investigated by means of FTIR and XRD. The thermal properties, degree of crystallinity, and melting behaviour of POM-based composites were analysed with TG, DSC, and TOPEM DSC methods. The tensile strength, Young’s modulus, toughness, and wettability of POM were investigated as well. A preliminary assessment of bioactivity, in vitro chemical stability, and formaldehyde release from POM/HA-g-PEG composites by Schiff’s test was also performed. An SEM/EDX method was used to observe the morphology of POM/HA-g-PEG composites. The results indicate that the addition of 1% HA-g-PEG slightly increases the melting temperature and degree of crystallinity. In small amounts, HA-g-PEG particles probably act as nucleating agents for the POM crystallization process. Incorporation of 5% HA-g-PEG to POM caused a decrease in the crystallinity of the polymer matrix, as a result, some mechanical properties of POM/HA-g-PEG composites also decreased. The thermal stability of POM/HA-g-PEG composites improved significantly from 309°C for unmodified POM to 342°C for POM/10.0% HA-g-PEG 600. The most effective thermal stabilizer was synthesized with the lowest mass-average molar mass PEG. The in vitro bioactivity test confirmed that, as the average molar mass of PEG in HA-g-PEG hybrids increased, POM-based composites indicated higher bioactivity. The in vitro chemical stability analysis results showed that both the POM matrix and the HA-g-PEG additive remain stable during the whole incubation time. Importantly, after seven days of dynamic incubation, no formaldehyde was detected in all filtrates, which is crucial in biomedical applications, among others.

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Synthesis and characterization of chitosan modified polyurethane bio-nanocomposites with biomedical potential

Cited by 70 publications

References 42 publications

Thermal properties of polyurethane-based composites modified with chitosan for biomedical applications

Thermal properties of polyurethane-based composites modified with chitosan for biomedical applications

Novel Poly(m‐phenyleneisophthalamide) Dielectric Composites with Enhanced Thermal Conductivity and Breakdown Strength Utilizing Functionalized Boron Nitride Nanosheets

Thermal Stabilization of Polyoxymethylene by PEG-Functionalized Hydroxyapatite: Examining the Effects of Reduced Formaldehyde Release and Enhanced Bioactivity

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