Chitin-natural clay nanotubes hybrid hydrogel

Zhang, Yun; Li, Jingjing; Zhou, Changren

doi:10.1016/j.ijbiomac.2013.03.042

Cited by 65 publications

(23 citation statements)

References 28 publications

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“…Here, the original -OH stretching peaks of cellulose and chitin at 3408 and 3445 cm −1 shifted towards one another in the composite hydrogels. Furthermore, the FTIR spectra of each hydrogel film when after the three US cycles showed a slight shift in the peak wavenumber towards the lower region in the -OH stretching peak and the vibration mode of Amide I at around 1650–1655 cm −1 in the chitin component [ 22 , 27 ]. This suggested that after the cycles, the wavenumber of the hydrogen bonds of the acetylamine group changed in the chitin-containing hydrogels.…”

Section: Resultsmentioning

confidence: 99%

“…Compared to cellulose hydrogels alone, these two polysaccharides have the possibility of forming extended, strong inter- intra- molecular hydrogen bonds in a composite cellulose–chitin polymer framework [ 18 , 19 , 20 , 21 ]. Even though materials developed from cellulose and chitin are composed on many inorganic and natural materials [ 22 , 23 , 24 , 25 ], materials from cellulose and chitin composite have a limited research history. Thus, in the present work, cellulose-chitin composite hydrogels (CCCHs) were fabricated and the US effect on their viscoelastic properties was described, based on an in situ analysis using a sono-deviced rheometer.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Viscoelasticity Behavior of Cellulose–Chitin Composite Hydrogels during Ultrasound Irradiation

Iresha

Kobayashi

2021

Gels

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Composite hydrogels with different cellulose and chitin loading were prepared, and their in-situ viscoelastic properties were estimated under cyclic exposure of 43 kHz and 30 W ultrasound (US) using a sono-deviced rheometer. US transmitted into the hydrogel caused it to soften within about 10 sec, thus causing a decline in the storage modulus (G′) and loss modulus (G″). However, when the US was stopped, the G′ and G″ returned to their initial values. Here, G′ dropped gradually in response to the US irradiation, especially in the first cycle. After the second and third cycles, the decline was much quicker, within a few seconds. When the chitin component in the hydrogel was increased, the drop was significant. FTIR analysis of the hydrogels suggested that the peaks of -OH stretching and amide I vibration near 1655 cm−1 shifted towards lower wave numbers after the third cycle, meaning that the US influenced the hydrogen bonding interaction of the chitin amide group. This repetitive effect contributed to the breakage of hydrogen bonds and increased the interactions of the acetylamine group in chitin and in the -OH groups. Eventually, the matrix turned into a more stabilized hydrogel.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Viscoelasticity Behavior of Cellulose–Chitin Composite Hydrogels during Ultrasound Irradiation

Iresha

Kobayashi

2021

Gels

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“…In contrast to S03, the S q of S05 slightly increases to 10.5 nm. This is due to the presence of the crosslinker MA in the composite [55]. From S q of 24.6 nm (S02), the S q of S04 decreases to 4.2 nm, while, with the addition of crosslinker MA (S06), it increases to 25 nm.…”

Section: Resultsmentioning

confidence: 99%

Unique Halloysite Nanotubes–Polyvinyl Alcohol–Polyvinylpyrrolidone Composite Complemented with Physico–Chemical Characterization

et al. 2017

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Abstract:A halloysite nanotubes-polyvinyl alcohol-polyvinylpyrrolidone (HNTs-PVA-PVP) composite has been investigated for a quite long time aiming at improving the physico-chemical characterization of HNTs. In this work, HNTs-PVA-PVP composite were prepared based on a unique procedure characterized by crosslinking two polymers with HNTs. The composite of two polymers were modified by treating HNTs with phosphoric acid (H 3 PO 4 ) and by using malonic acid (MA) as a crosslinker. The composite was also treated by adding the dispersion agent sodium dodecyl sulfate (SDS). The HNTs-PVA-PVP composite shows better characteristics regarding agglomeration when HNTs is treated in advance by H 3 PO 4 . Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), brunauer-emmett-teller (BET), size distribution, and atomic force microscopy (AFM) are used to characterize the physio-chemical properties of the composite. FTIR shows additional peaks at 2924.29, 1455.7, and 682.4 cm −1 compared to the neat HNTs due to adding MA. Despite that, the XRD spectra do not show a significant difference, the decrease in peak intensity could be attributed to the addition of semi-crystalline PVA and the amorphous PVP. The images taken by TEM and FESEM show the possible effects of MA on the morphology and internal feature of HNTs-PVA-PVP composite treated by MA by showing the deformation of the matrix. The BET surface area increased to 121.1 m 2 /g compared to the neat HNTs at 59.1 m 2 /g. This result, the second highest recorded result, is considered a breakthrough in enhancing the properties of HNTs-PVA-PVP composite, and treatment by MA crosslinking may attribute to the size and the number of the pores. The results from these techniques clearly showed that a significant change has occurred for treated HNTs-PVA-PVP composite where MA was added. The characterization of HNTs-PVA-PVP composite with and without treating HNTs and using crosslinker may lead to a better understanding of this new composites as a precursor to possible applications in the dentistry field.

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“…The outstanding mechanical properties of composites are a result of the load transfer from polymer matrix to filler materials that are of higher stiffness and failure strength. Conventional tubular like particles have high tensile modulus, enabling them to be widely investigated as a filler material in nanocomposites with ideal mechanical strength . In this work, CNT‐reinforced shape memory composites of TPI and low‐density PE (LDPE) were prepared by a mechanical blending method.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional tubular like particles have high tensile modulus, enabling them to be widely investigated as a filler material in nanocomposites with ideal mechanical strength. [38][39][40][41] In this work, CNT-reinforced shape memory composites of TPI and low-density PE (LDPE) were prepared by a mechanical blending method. The mechanical, thermal, and shape memory properties of the TPI/LDPE composites were studied in detail, and a schematic diagram was proposed to illustrate the shape memory behavior of the TPI/LDPE composites.…”

mentioning

confidence: 99%

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Xia

Gui-xue

2019

Polymers for Advanced Techs

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Shape memory composites of trans‐1,4‐polyisoprene (TPI) and low‐density polyethylene (LDPE) with easily achievable transition temperatures were prepared by a simple physical blending method. Carbon nanotubes (CNTs) were introduced to improve the mechanical properties of the TPI/LDPE composites. The mechanical, cure, thermal, and shape memory properties of the TPI/LDPE/CNTs composites were investigated in this study. In these composites, the cross‐linked network generated in both the TPI and LDPE portions acted as a fixed domain, while the crystalline regions of the TPI and LDPE portions acted as a domain of reversible shape memory behavior. We found that CNTs acted as not only reinforced fillers but also nucleation agents, which improved the crystalline degree of the TPI and LDPE portions of the composites. Compared with the properties at the other CNT doses, the mechanical properties of the TPI/LDPE composites when the CNT dose was 1 phr were improved significantly, showing excellent shape memory properties (Rf = 97.85%, Rr = 95.70%).

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Chitin-natural clay nanotubes hybrid hydrogel

Cited by 65 publications

References 28 publications

In Situ Viscoelasticity Behavior of Cellulose–Chitin Composite Hydrogels during Ultrasound Irradiation

In Situ Viscoelasticity Behavior of Cellulose–Chitin Composite Hydrogels during Ultrasound Irradiation

Unique Halloysite Nanotubes–Polyvinyl Alcohol–Polyvinylpyrrolidone Composite Complemented with Physico–Chemical Characterization

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

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