A novel and simple procedure to synthesize chitosan-graft-polycaprolactone in an ionic liquid

Wang, Zhaodong; Zheng, Liuchun; Li, Chuncheng; Zhang, Dong; Xiao, Yaonan; Guan, Guoqing; Zhu, Wenxiang

doi:10.1016/j.carbpol.2013.01.090

Cited by 65 publications

(43 citation statements)

References 34 publications

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“…HTCC has two distinct weight loss stages, which started at about 50 and 240 °C. The first weight loss for HTCC is ascribed to the vaporization of bound water and residual organic solvent during the preparation of HTCC [33,34]; the second one is due to the thermal decomposition of HTCC. The two-stage weight loss in pyraclostrobin loaded HTCC-capped MSNs is noteworthy.…”

Section: Resultsmentioning

confidence: 99%

Quaternized Chitosan-Capped Mesoporous Silica Nanoparticles as Nanocarriers for Controlled Pesticide Release

et al. 2016

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Nanotechnology-based pesticide formulations would ensure effective utilization of agricultural inputs. In the present work, mesoporous silica nanoparticles (MSNs) with particle diameters of ~110 nm and pore sizes of ~3.7 nm were synthesized via a liquid crystal templating mechanism. A water-soluble chitosan (CS) derivative (N-(2-hydroxyl)propyl-3-trimethyl ammonium CS chloride, HTCC) was successfully capped on the surface of pyraclostrobin-loaded MSNs. The physicochemical and structural analyses showed that the electrostatic interactions and hydrogen bonding were the major forces responsible for the formation of HTCC-capped MSNs. HTCC coating greatly improved the loading efficiency (LC) (to 40.3%) compared to using bare MSNs as a single encapsulant (26.7%). The microstructure of the nanoparticles was revealed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The pyraclostrobin-loaded nanoparticles showed an initial burst and subsequent sustained release behavior. HTCC-capped MSNs released faster than bare MSNs in the initial stage. Pyraclostrobin-loaded HTCC-capped MSNs with half doses of pyraclostrobin technical demonstrated almost the same fungicidal activity against Phomopsis asparagi (Sacc.), which obviously reduced the applied pesticide and enhanced the utilization efficiency. Therefore, HTCC-decorated MSNs demonstrated great potential as nanocarriers in agrochemical applications.

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Section: Resultsmentioning

confidence: 99%

Quaternized Chitosan-Capped Mesoporous Silica Nanoparticles as Nanocarriers for Controlled Pesticide Release

et al. 2016

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“…Herein, there is only one weight loss in the TG curve of CS after full pretreatment. The first weight loss for HTCC is ascribed to the residual anhydrous ethanol and acetone during the regeneration of HTCC (Wang et al, 2013). The decomposition temperature of HTCC is lower than that of CS, and it decreases with an increase of DS (Table 1).…”

Section: Thermal Analysismentioning

confidence: 94%

“…The adsorption peak at 1595 cm −1 corresponds to the N H deformation vibration of amino groups (Lim & Hudson, 2004), absent in the HTCC spectra, indicating that the primary amide has been changed to a secondary amine by the nucleophilic substitution of NH 2 and epoxy groups. The peak at 1660 cm −1 reflects bending vibration of N H bond, manifesting the presence of secondary amines (Gorshkova et al, 2011;Wang et al, 2013). The peak at 1475 cm −1 for HTCC spectra can be assigned to the C H bending of −N(CH 3 ) + 3 , suggesting the introduction of −N(CH 3 ) + 3 in the CS backbone (Lim & Hudson, 2004).…”

Section: Synthesis and Ftir Analysis Of Htccmentioning

confidence: 97%

“…The result is consistent with those obtained in previous works. It is believed that the introduced groups destroy the hydrogen bonds and endow the biopolymer chains more flexible under the thermal effect (Cao, Li, & Zhang, 2011;Prabhakar, Bajpai, Bajpai, & Tiwari, 2014;Wang et al, 2013).…”

Section: Thermal Analysismentioning

confidence: 99%

“…Recently, ILs were considered as a kind of good solvent and homogeneous reaction media for CS (Umar, Abu Naim, & Sanagi, 2014;Wang et al, 2013Xie, Zhang, & Li, 2006), cellulose (Sun, Tian, Xue, Zhang, & Mu, 2014;Wang, Zhu, Wang, Huang, & Wang, 2010;Zhang, Ping, Zhang, & Shen, 2003), starch (Wilpiszewska & Spychaj, 2011), cyclo-dextrine (Zakrzewska, Bogel-Łukasik, & Bogel-Łukasik, 2010), and other biopolymers. Among the homogeneous modifications of CS, chitosan-graftpolycaprolactone (CS-g-PCL) (Wang et al, 2013) was synthesized in 1-ethyl-3-methylimidazolium acetate, in which both OH and NH 2 participated in the reaction. The CS-g-PCL exhibited the advantageous properties of both CS and PCL, and its glass transition temperature decreased with the increase of PCL grafting content.…”

Section: Introductionmentioning

confidence: 99%

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A simple and convenient method to synthesize N-[(2-hydroxyl)-propyl-3-trimethylammonium] chitosan chloride in an ionic liquid

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Room temperature ionic liquids (RTILs) have proved over recent years to be useful and unique reaction media for a variety of chemical reactions. Faster reaction rates and better selectivities are often observed in RTILs as compared to those in common organic solvents. In addition to these advantages, the low volatility, nonflammability, and recycling potential also help RTILs become a preferred alternative reaction medium to meet environmental and other requirements. This is evidenced by the ever increasing number of papers published in this area every year and interesting and important discoveries. When conventional free radical polymerizations are carried out in RTILs, there is an increase in the propagation rate due to the high polarity of the RTIL and a decrease in the termination rate because of the high viscosity of the RTILs, and thus the overall reaction rate is greatly increased along with an increase in molecular weight. For living/controlled polymerization such as atom transfer radical polymerization and radical addition‐fragmentation and transfer, the reactions in RTILs are still controllable with faster reaction rates and easy separation of catalysts and/or ligands from the resulting polymers. Nearly all types of polymerization processes have now been successfully conducted in RTILs, often with advantageous effects.

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A novel and simple procedure to synthesize chitosan-graft-polycaprolactone in an ionic liquid

Cited by 65 publications

References 34 publications

Quaternized Chitosan-Capped Mesoporous Silica Nanoparticles as Nanocarriers for Controlled Pesticide Release

Quaternized Chitosan-Capped Mesoporous Silica Nanoparticles as Nanocarriers for Controlled Pesticide Release

A simple and convenient method to synthesize N-[(2-hydroxyl)-propyl-3-trimethylammonium] chitosan chloride in an ionic liquid

Polymerization in Ionic Liquids

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