Frustrated crystallisation and hierarchical self-assembly behaviour of comb-like polymers

Shi, Haifeng; Zhao, Ying; Dong, Xia; Zhou, Yong; Wang, Dujin

doi:10.1039/c2cs35350d

Cited by 123 publications

(112 citation statements)

References 221 publications

(296 reference statements)

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“…The phase change enthalpy of poly(mono ethylene glycol n-tetradecyl ether vinyl ethers) (89 J/g) was approximately equal to that of poly(hexadecyl acrylate) (86 J/g) [29]. In the DSC curves of PC14EnVEs (n = 1, 2), the single peak demonstrated that there was only one packing form for the side chains, which was the hexagonal structure [8,30,31]. In order to examine the reliability of phase change materials in the process of actual use, PC14E1VE (Mn = 2.3 × 10 −4 ) and PC14E2VE (Mn = 2.3 × 10 −4 ) were chose for a thermal cycling test.…”

Section: Thermal Behavior Of Poly(mono/diethylene Glycol N-tetradecylmentioning

confidence: 98%

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

2018

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At present, research on the relationship of comb-like polymer phase change material structures and their heat storage performance is scarce. Therefore, this relationship from both micro and macro perspectives will be studied in this paper. In order to achieve a high phase change enthalpy, ethylene glycol segments were introduced between the vinyl and the alkyl side chains. A series of poly(mono/diethylene glycol n-tetradecyl ether vinyl ethers) (PC 14 E n VEs) (n = 1, 2) with various molecular weights were polymerized by living cationic polymerization. The results of PC 14 E 1 VE and PC 14 E 2 VE showed that the minimum number of carbon atoms required for side-chain crystallization were 7.7 and 7.2, which were lower than that reported in the literature. The phase change enthalpy 89 J/g (for poly(mono ethylene glycol n-tetradecyl ether vinyl ethers)) and 86 J/g (for poly(hexadecyl acrylate)) were approximately equal. With the increase of molecular weight, the melting temperature, the melting enthalpy, and the initial thermal decomposition temperature of PC 14 E 1 VE changed from 27.0 to 28.0 • C, from 95 to 89 J/g, and from 264 to 287 • C, respectively. When the number average molar mass of PC 14 E n VEs exceeded 20,000, the enthalpy values remained basically unchanged. The introduction of the ethylene glycol chain was conducive to the crystallization of alkyl side chains.

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Section: Thermal Behavior Of Poly(mono/diethylene Glycol N-tetradecylmentioning

confidence: 98%

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

2018

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“…At present, the energy-saving units such as polyethylene glycol (PEG) [27,28,32], fatty acid [33][34][35][36][37][38][39][40] and the alkyl side groups, etc. have been used to prepare polymeric-based PCMs [41][42][43][44][45][46][47]. Zhang et al prepared a series of poly(vinyl alcohol)-g-PEG copolymers with different graft ratios [48].…”

Section: Introductionmentioning

confidence: 99%

Shape-stabilized phase change materials based on poly(ethylene-graft-maleic anhydride)-g-alkyl alcohol comb-like polymers

Liu

Wang

Qi³

et al. 2015

Solar Energy Materials and Solar Cells

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“…26 In addition, Dubin Paul L. et al have deeply discussed the critical conditions for complex formation of mixed micelles between polyelectrolyte and oppositely charged mixed micelles, 27,28 polycation/anionic-nonionic mixed micelle systems, 29 and anionic/nonionic-polycation mixed micelle systems. [28][29]32,33 Moreover, it is convenient to investigate the structure and interaction between PPEG and PQAs without interference from external forces. And through controlling the PH, temperature, distribution density, the length scale, and the grafting degree of alkyl side chains along polymeric main chains, these micro/nano-structural materials have different properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of interaction between a polycation and a nonionic polymer on their cross-assembly into mixed micelles

et al. 2015

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In this paper, to investigate the effects of interactions between poly(quaternary ammonium) salts (PQAs) and poly(ethylene glycol) on their mixed micellar surface structures and properties under spontaneous conditions, a series of PQAs were first designed and synthesized by atom transfer radical polymerization (ATRP) using 2-(dimethylamino) ethyl methacrylate (DMAEMA) quaternized by bromobutane, bromooctane, and bromododecane, respectively. Poly(poly(ethylene glycol) methyl ether methacrylate) (PPEG) with a similar degree of polymerization was also prepared using poly(ethylene glycol) methyl ether methacrylate by ATRP. Next, these PQAs were mixed with an equal weight of PPEG in water to cross-assemble into mixed micelles. The structures and features of these mixed micelles were characterized by fluorescence measurements, transmission electron microscopy (TEM), dynamic light scattering (DLS), phase analysis light scattering (PALS), proton nuclear magnetic resonance ((1)H NMR), and hydrogen-hydrogen correlation spectroscopy nuclear magnetic resonance (H-H COSY NMR). These results suggest that PQAs and PPEG mixtures can cross-assemble into mixed micelles with low CMC. The surface structures, particle sizes, size distributions, and zeta potentials of PQAs and PPEG mixtures can be tailored by varying the alkyl chain length in quaternary ammonium salts, and the alkyl chain length also influences the distribution and the alkyl chain orientation of quaternary ammonium salts on mixed micelle surfaces. In addition, cytotoxicity of these mixed micelles can be markedly reduced by PPEG compared with their corresponding PQAs, but their good antibacterial activities are still maintained to a certain degree, as evaluated by methyl tetrazolium assay (MTT) and minimum inhibitory concentration (MIC). Our present work provides a new avenue for the preparation of biocompatible and antibacterial materials for biomedical applications.

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Frustrated crystallisation and hierarchical self-assembly behaviour of comb-like polymers

Cited by 123 publications

References 221 publications

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

Shape-stabilized phase change materials based on poly(ethylene-graft-maleic anhydride)-g-alkyl alcohol comb-like polymers

Effects of interaction between a polycation and a nonionic polymer on their cross-assembly into mixed micelles

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