Polydimethylsiloxane-modified chitosan I. Synthesis and structural characterisation of graft and crosslinked copolymers

Enescu, Daniela; Hamciuc, Viorica; Pricop, Lucia; Hamaide, Thierry; Harabagiu, Valeria; Simionescu, Bogdan C.

doi:10.1007/s10965-008-9204-4

Cited by 23 publications

(15 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been reported that the reaction of chitosan with terminal epoxide groups of poly(dimethylsiloxane) (PDMS) takes place to a very small extent, resulting in mild crosslinking, despite performing the reaction at 70°C for 24 h. In fact, at the end of this reaction, 58 % of the unreacted PDMS was isolated. This has been attributed to the difference in solubility between chitosan and PDMS [31]. In the same way, soluble polymers had been obtained by Mas Haris and Raju [22] by the reaction of chitosan with ENR-50.…”

Section: Resultsmentioning

confidence: 67%

A new route to polymeric materials derived from chitosan and natural rubber

Venkatanarasimhan

Dhamodharan

2015

Polym. Bull.

View full text Add to dashboard Cite

In this work, the synthesis and characterization of a new polymer, natural rubber-g-chitosan, from biopolymers available in nature is reported. In this process, soft and amorphous natural rubber (NR) is converted into a relatively more dimensionally stable new polymer (glass transition temperature changes from -68 to ?94.5°C), with versatile solubility in a variety of common organic solvents. For this purpose, mild epoxidation of NR is carried out to provide a reactive handle for the grafting of chitosan. Thus, chitosan-grafted natural rubber with different chitosan loading have been synthesized and characterized. The characterization of the new polymers revealed that the grafting process resulted in enhanced glass transition temperature in comparison to NR, remarkable improvement in thermal stability in comparison to NR and chitosan and the much needed solubility for the chitosan component, which is otherwise insoluble in common organic solvents. The NR-gchitosan is fully amorphous in the solid state, similar to NR. These value-added characteristics promise the utility and processability of the newly synthesized materials in adhesives, packaging industries and in many other areas where natural rubber and chitosan are vitally employed.

show abstract

Section: Resultsmentioning

confidence: 67%

A new route to polymeric materials derived from chitosan and natural rubber

Venkatanarasimhan

Dhamodharan

2015

Polym. Bull.

View full text Add to dashboard Cite

show abstract

“…In the FTIR spectrum of the CS-TS-PDMS membrane, the covalent linking through the reaction of amino groups of CS and epoxy units attached to the siloxane chains, as well as the increasing of membrane hydrophobic character induced by siloxane component determines a notable diminishing of the absorbance bands between 3500-3100 cm −1 . Moreover, strong bands characteristic to siloxane moiety (1261 and 800 cm −1 Si-CH 3 ; 1094-1026 cm −1 , Si-O-Si) [17], partially covering the bands of CS are also visible in the spectrum.…”

Section: Ftir Characterizationmentioning

confidence: 95%

“…The resulted composite membranes, with average thicknesses of about 70 µm (from SEM images of the cross-sections), were labeled as CS-TS-HS and CS-TS-TPP, respectively. The PDMS cross-linked composite membrane (CS-TS-PDMS) was obtained adapting a procedure previously described for the preparation of PDMS modified chitosan [17]. Shortly, PDMS (NH 2 /epoxy = 1/1 molar ratio) was added in situ to the CS/TS dispersion prepared as described in the previous paragraph and the mixture was stirred at 40 • C until complete homogenization.…”

Section: Membrane Cross-linking By Sulfuric Acid (Hs) and By Pentasodmentioning

confidence: 99%

“…Apart from the absorption band at 1633 cm −1 (deformation vibration, adsorbed water) and of a broad band in the range of 879-409 cm −1 (Ti-O), in the spectrum of TS, the presence of four other absorption bands between 1243 and 967 cm −1 (1243 and 1141 cm −1 , asymmetric and symmetric stretching vibrations of S=O groups; 1055 cm −1 and 967 bands, asymmetric and symmetric stretching vibrations of S-O units) confirms the sulfating process and indicates a bidentate coordination of Three different agents, such as sulfuric acid (HS), pentasodium tripolyphosphate (TPP), and bis(glycidoxypropyl)-terminated polydimethylsiloxane (PDMS) were further used for cross-linking and to study their influence on the structure and the properties of the composite membranes. The first two cross-linkers provide a well-known electrostatic interactions between protonated amino groups of CS and cross-linker anions [15], while PDMS undergoes covalent cross-linking through the well-known reaction between CS amino groups and epoxy units attached to the siloxane chains [17] (Scheme 1). Based on its intrinsic properties (high hydrophobicity, very low T g , thermal stability up to 300 • C, relatively low variation of its properties with temperature [20], PDMS cross-linker is expected to provide to the membrane a higher flexibility and lower shrinkage during drying, as well as a controllable hydrophilic-hydrophobic balance.…”

Section: Ftir Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature

Humelnicu¹,

Samoilă²,

Asăndulesa³

et al. 2020

Polymers

Self Cite

View full text Add to dashboard Cite

Chitosan-sulfated titania composite membranes were prepared, characterized, and evaluated for potential application as polymer electrolyte membranes. To improve the chemical stability, the membranes were cross-linked using sulfuric acid, pentasodium triphosphate, and epoxy-terminated polydimethylsiloxane. Differences in membranes’ structure, thickness, morphology, mechanical, and thermal properties prior and after cross-linking reactions were evaluated. Membranes’ water uptake capacities and their chemical stability in Fenton reagent were also studied. As proved by dielectric spectroscopy, the conductivity strongly depends on cross-linker nature and on hydration state of membranes. The most encouraging results were obtained for the chitosan-sulfated titania membrane cross-linked with sulfuric acid. This hydrated membrane attained values of proton conductivity of 1.1 × 10−3 S/cm and 6.2 × 10−3 S/cm, as determined at 60 °C by dielectric spectroscopy and the four-probes method, respectively.

show abstract

“…Polydimethylsiloxane-modified chitosan has been synthesised by reaction between amine groups of chitosan and epoxy group of polydimethylsiloxane (PDMS) [124]. By using a difunctional glycidoxypropyl terminated PDMS, a crosslinked polymer was prepared.…”

Section: Hydroxyalkyl Chitosanmentioning

confidence: 99%

Chitosan Amphiphilic Derivatives. Chemistry and Applications

Aranaz¹,

Harris²,

Heras³

2010

COC

263

144

View full text Add to dashboard Cite

Chitosan is a natural polymer composed of randomly distributed-(1-4)-linked D-glucosamine (deacetylated unit) and Nacetyl-D-glucosamine (acetylated unit). It has been described as a non-toxic, biodegradable and biocompatible polymer with very interesting biological properties, such as permeation-enhancing and mucoadhesive properties, anticoagulant and antimicrobial activity and so on. Chitosan has been used in several areas such as biomedical, pharmaceutical and biotechnological fields as well as in the food industry. Recently, there has been a growing interest in the modification of chitosan to improve its solubility in physiological conditions, to introduce new applications or to improve chitosan biological properties. Research and development on a variety of amphiphilic copolymers containing hydrophobic and hydrophilic segments, have been very active due to their spontaneous self-assembly behaviour in aqueous media These smart transitions often lead to diverse functional compartment structures like micelles, vesicles and gels, which represent promising applications in the field of biotechnology and pharmaceutics. The aim of the present paper is to review the latest advances in the synthesis of chitosan amphiphilic derivatives with a special emphasis in their applications.

show abstract

Polydimethylsiloxane-modified chitosan I. Synthesis and structural characterisation of graft and crosslinked copolymers

Cited by 23 publications

References 26 publications

A new route to polymeric materials derived from chitosan and natural rubber

A new route to polymeric materials derived from chitosan and natural rubber

Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature

Chitosan Amphiphilic Derivatives. Chemistry and Applications

Contact Info

Product

Resources

About