使用市售的炔丙酸前体通过DCC偶联成功制备了炔基官能化的多面体低聚倍半硅氧烷,并通过点击化学将其进一步用于修饰PEG- b - PCL ,从而成功合成了POSS接枝的PEG- b- PCL嵌段共聚物。通过FTIR,1 H NMR,GPC和电喷雾电离质谱(ESI-MS)全面确认了样品的结构。聚合物的热性质通过DSC研究。与纯PEG- b相比,具有接枝POSS的共聚物表现出出色的热性能,熔融温度提高了约100°C-PCL。此外,具有高结晶诱导能力的侧基POSS充当物理交联点和热增强剂并有效地诱导有序相分离,从而产生具有高平行度和光滑界面的纳米结构。
Azide pendent groups of aliphatic polyesters have been derivatized into tertiary amines, ammonium salts and poly(ethylene oxide) grafts. The experimental conditions have been optimized (organic solvent, 35 degrees C), such that the aliphatic polyesters are not degraded, including even poly(lactide) which is very sensitive to attack by weak nucleophiles.
A highly versatile strategy was implemented in order to attach a range of polymer grafts and functional groups along the backbone of poly(ε-caprolactone). α-Chloro-ε-caprolactone (αClεCL) was first prepared by the Baeyer−Villigeroxidation of α-chlorocyclohexanone. This monomer (αClεCL) was then copolymerized with ε-caprolactone in the presence of 2,2-dibutyl-2-stanna-1,3-dioxepane. Finally, the pendant
Synthetic applications of the [2+2] cycloaddition products of ketene alkylsilylacetals with acrylonitrile
作者:Gérard Rousseau、Alain Quendo
DOI:10.1016/s0040-4020(01)88226-0
日期:1992.1
2-Cyanocyclobutane alkylsilylacetals, obtained by a [2+2] cycloaddition reaction of ketene alkylsilylacetals and acrylonitrile, have allowed the synthesis of 2-cyanoclobutanones, 4-chloro-4-cyanobutanoates and 4-cyanobutanoates by respectively acidic catalysis, FeCl3 cleavage and nBu4NF treatment. The cycloadducts obtained from chloroketene alkylsilylacetals give 2-cyanocyclopropanecarboxylates by
Modification of PEG-b-PCL block copolymer with high melting temperature by the enhancement of POSS crystal and ordered phase structure
作者:Guangzhong Yin、Guangxin Chen、Zheng Zhou、Qifang Li
DOI:10.1039/c5ra01971k
日期:——
successful synthesis of POSS grafted PEG-b-PCL block copolymer. The structures of the samples were comprehensively confirmed by FTIR, 1H NMR, GPC and electrospray ionization mass spectrometry (ESI-MS). The thermal properties of the polymers were investigated via DSC. The copolymers with grafted POSS showed excellent thermal properties with an increase of approximately 100 °C in melting temperature compared
使用市售的炔丙酸前体通过DCC偶联成功制备了炔基官能化的多面体低聚倍半硅氧烷,并通过点击化学将其进一步用于修饰PEG- b - PCL ,从而成功合成了POSS接枝的PEG- b- PCL嵌段共聚物。通过FTIR,1 H NMR,GPC和电喷雾电离质谱(ESI-MS)全面确认了样品的结构。聚合物的热性质通过DSC研究。与纯PEG- b相比,具有接枝POSS的共聚物表现出出色的热性能,熔融温度提高了约100°C-PCL。此外,具有高结晶诱导能力的侧基POSS充当物理交联点和热增强剂并有效地诱导有序相分离,从而产生具有高平行度和光滑界面的纳米结构。
Synthesis and Characterization of Polyurethane-Grafted Single-Walled Carbon Nanotubes via Click Chemistry
作者:Sravendra Rana、Jae Whan Cho、Indresh Kumar
DOI:10.1166/jnn.2010.2434
日期:2010.9.1
Polyurethane (PU)-grafted carbon nanotubes were synthesized by the coupling of alkyne moiety decorated single walled carbon nanotube (SWCNT) with azide moiety containing PU using Cu(I) catalyzed Huisgen [3 + 2] cycloaddition click chemistry. The azide moiety containing poly(ε-caprolactone)diol was synthesized by ring-opening polymerization and further used for PU synthesis. Alkyne-functionalizion of SWCNT was completed by the reaction of p-aminophenyl propargyl ether with SWCNT using a solvent free diazotization procedure. Nuclear magnetic resonance, Fourier transform infrared, and Raman spectroscopic measurements confirmed the functionalization of SWCNT. Scanning electron microscopy and transmission electron microscopy images showed an excellent dispersion of SWCNTs, and specially debundling of SWCNTs could be observed due to polymer assisted dispersion. A quantitative grafting was successfully achieved even at high content of functional groups.