Effect of synthetic pathways on the phase transition and side-chain crystallization behavior of alkyl-substituted cellulose ethers

Chen, Xi; Zheng, Nan; Qiao, Wei; Liu, Lingzhi; Men, Yongfeng

doi:10.1039/c4py00394b

Cited by 22 publications

(12 citation statements)

References 51 publications

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“…When long alkyl chains were grafted onto them, the resulted derivatives exhibited special aggregation structure . In our previous work, the side chain crystallization behavior of alkyl‐substituted cellulose ethers, alkyl‐substituted cellulose esters, and hydroxypropyl cellulose esters are investigated systematically . Cellulose ethers synthesized by homogeneous reactions exhibited poor crystallization ability, the side chains packed into hexagonal crystals.…”

Section: Introductionmentioning

confidence: 99%

Side chain packing states of chitosan‐based supramolecular derivatives containing long alkyl side chains

Liu

Lyu

Xiang

et al. 2020

Polymer Crystallization

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A series of chitosan-based supramolecular comb-like polymers containing long alkyl side chain were prepared. They aggregated into layered structure. When the alkyl side chain was longer than 16 carbons, the long alkyl side chains exhibited crystallization behavior. During heating process, the packing structure of comb-like polymers with side chain length from 10 to 20 showed a peculiar behavior of volume shrinkage, but that of samples with much longer side chain (>22) expanded. Such results could be attributed to the different packing structure of side chains when they possess different length. Both the steric hindrance and the tendency of side chain aggregation affect the packing state of alkyl side chains together.

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Section: Introductionmentioning

confidence: 99%

Side chain packing states of chitosan‐based supramolecular derivatives containing long alkyl side chains

Liu

Lyu

Xiang

et al. 2020

Polymer Crystallization

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“…However, it should be noted that the phase change enthalpy is much lower than that of linear n ‐alkanes, n ‐fatty alcohols and main‐chain crystallization polymers due to the low crystallinity of the end‐restricted side chains. This further shows that the varied lamella thickness and side‐chain crystal size of comb‐like polymers affect the crystallization habits, especially on the nanometric scale 28,29 …”

Section: Introductionmentioning

confidence: 86%

Side‐chain crystallization and phase transition of poly[styrene‐co‐(maleic anhydride)]‐g‐alkylamine comb‐like polymers

Mao

Wang

et al. 2021

Polymer International

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Taking NHCO as the chemical spacer, poly[styrene‐co‐(maleic anhydride)]‐g‐alkylamine (SMACnN) comb‐like polymers are prepared through grafting reaction between poly[styrene‐co‐(maleic anhydride)] and n‐alkylamine with n changing from 12 to 18. SMACnN comb‐like polymers present an obvious crystallization behavior owing to the introduced alkyl side chains, and the melting temperature and enthalpy of the side‐chain crystallites increase from 9.2 to 41.6 °C and from 6.0 to 17.6 kJ mol−1, respectively, showing a variation with the side‐chain length. At least 12 side‐chain carbon atoms are required to pack into a hexagonal crystal structure for SMACnN comb‐like polymers. Fourier transform infrared and X‐ray analysis results demonstrate the phase transition from hexagonal to an amorphous state, and the conformationally disordered alkyl chains affect the packing manner of side‐chain crystallites. Including the side‐chain length and polymer backbone, the chemical spacer between the side chain and the main chain influences the formation of side‐chain crystallites and the phase transition process. So, the study of SMACnN further strengthens the understanding of the phase transition behavior and side‐chain crystallization of comb‐like polymers triggered by the side‐chain length and the microstructure differences. © 2021 Society of Industrial Chemistry.

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“…Previous studies on functional materials of cellulose-based SSPCMs were mainly aliphatic chain, poly(ethylene glycol) (PEG) or MPEG (Li et al 2009;Cheng et al 2008;Chen et al 2014;Lucie et al 2011). Inspired by our previous fundamental research into comb-like polymeric phase change materials (Meng et al 2013a, b), a novel cellulosebased SSPCM was proposed in this study.…”

Section: Introductionmentioning

confidence: 98%

“…Cheng et al (2008) prepared cellulose diacetate-isophorone diisocyanate-poly(-ethylene glycol) monomethyl ether (CDA-IPDI-MPEG) SSPCMs through a two-step reaction and determined its melting enthalpy (DH m ) and crystallization enthalpy (DH c ) to be 25.45 and 24.86 J/g and its melting temperature (T m ) and crystallization temperature (T c ) to be 52.9 and 28.6°C, respectively. Chen et al (2014) systematically investigated the effect of different synthetic pathways on the phase transition behavior of cellulose ethers. The results show that when the carbon atom number of the side chain exceeds 14, the cellulose ethers synthesized by homogeneous reactions are crystallizable.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of cellulose-g-polyoxyethylene (2) hexadecyl ether solid–solid phase change materials

Han

Zhang

et al. 2016

Cellulose

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A series of novel solid-solid phase change materials, namely, cellulose-g-polyoxyethylene (2) hexadecyl ether (Cellulose-g-E 2 C 16 ) copolymers, were synthesized using toluene 2,4-diisocyanate (TDI) as a coupling reagent in the ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). The optimum prepolymerization conditions were determined to be 25°C and 75 min without catalyst, and the optimum reaction conditions of the grafting step were 90°C, 6 h and 0.1 wt% dibutyltin dilaurate (DBTDL, weight percent of TDI). The successful grafting was confirmed by FTIR and 1 H-NMR. The properties of the Cellulose-g-E 2 C 16 copolymers were investigated by DSC, TG and XRD. It is shown that the heat storage ability and phase change temperature of Cellulose-g-E 2 C 16 copolymers depended on the degree of substitution. The crystalline type of the grafted E 2 C 16 was not affected by the cellulosic backbone. Compared with E 2 C 16 , Cellulose-g-E 2 C 16 copolymers showed better thermal stability. They are expected to be widely applied in the area of thermal energy storage.

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Effect of synthetic pathways on the phase transition and side-chain crystallization behavior of alkyl-substituted cellulose ethers

Cited by 22 publications

References 51 publications

Side chain packing states of chitosan‐based supramolecular derivatives containing long alkyl side chains

Side chain packing states of chitosan‐based supramolecular derivatives containing long alkyl side chains

Side‐chain crystallization and phase transition of poly[styrene‐co‐(maleic anhydride)]‐g‐alkylamine comb‐like polymers

Synthesis and characterization of cellulose-g-polyoxyethylene (2) hexadecyl ether solid–solid phase change materials

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