Two series of novel cholesteryl-containing H-bonded liquid crystals were prepared through facile self-assembly between cholesteryl isonicotinate （proton acceptor） exhibiting a monotropic cholesteric phase, and the 4...Two series of novel cholesteryl-containing H-bonded liquid crystals were prepared through facile self-assembly between cholesteryl isonicotinate （proton acceptor） exhibiting a monotropic cholesteric phase, and the 4-alkoxy-benzoic acid or 4-alkoxy cinnamic acid （proton donor）. It was found that the increase of the conjugate length as well as the terminal length can contribute to enhance the interaction of molecules and thus significantly influenced the thermal behaviors of H-bonded LCs. The cholesteric reflection spectra of the induced mesogenic complexes were located in the visible region with the color tuneable thermo-sensitivity, which could be used for display application.展开更多
A stable Sc phase is formed through hydrogen bonding between side-chain aromatic acid groups of polysiloxane: Bending of polysiloxane with N-Acetyl Latimic acid (NAA) gives a chiral S c * phase; The influence of polym...A stable Sc phase is formed through hydrogen bonding between side-chain aromatic acid groups of polysiloxane: Bending of polysiloxane with N-Acetyl Latimic acid (NAA) gives a chiral S c * phase; The influence of polymerism and hydrogen bond induction effect over mesophase is discussed. The influence of NAA over mesophase is studied.展开更多
A new composite chiral liquid crystal containing L-amino acid derivatives was prepared and their liquid crystal properties were investigated. Results show that they could exhibit liquid crystal through hydrogen bonding.
Two series of novel tolane-type liquid crystals （LCs） comprising of hydrogen-bonded organic acids were synthesized. The formation of dimerized H-bond LCs was confirmed by IR spectroscopy, and mesomorphic properties ...Two series of novel tolane-type liquid crystals （LCs） comprising of hydrogen-bonded organic acids were synthesized. The formation of dimerized H-bond LCs was confirmed by IR spectroscopy, and mesomorphic properties of the LCs were investigated by differential scanning calorimetry （DSC） and polarizing optical microscopy （POM）. It was found that the end groups of the liquid crystals as well as the unsaturated rigid core had effect on the mesomorphic properties.展开更多
Polymer-dispersed liquid crystal(PDLC)films comprising polyvinyl alcohol(PVA)and liquid crystal monomer(LCM)were successfully obtained by the method of solution casting&thermal compressing.LCM was distributed orde...Polymer-dispersed liquid crystal(PDLC)films comprising polyvinyl alcohol(PVA)and liquid crystal monomer(LCM)were successfully obtained by the method of solution casting&thermal compressing.LCM was distributed orderly in PVA matrix by hydrogen bond interaction,to form PVA-LCM interpe net rating-layered networks.When the mass fraction of LCM was up to 35 wt%,the corresponding in-plane thermal conductivity coefficient(λ//)of PDLC film was significantly increased to 1.41 W m^(-1)K^(-1),about 10.8 times that of neat PVA(0.13 W m^(-1)K^(-1)).High intrinsicλ//values of PDLC films were mainly attributed to the formed microscopic-ordered structures from ordered stacking of LCM,ordered arrangement of PVA chains,and their hydrogen bond interaction.This work would offer a new way to design and prepare novel intrinsic high thermal conductive polymers.展开更多
The compound （H3IDC）（Prz）0.5（H2O） （H3IDC = imidazole-4,5-dicarboxylate, Prz = piperazine） has been prepared from a hydrothermal approach and was characterized by IR analysis and X-ray diffraction. Its crystal ...The compound （H3IDC）（Prz）0.5（H2O） （H3IDC = imidazole-4,5-dicarboxylate, Prz = piperazine） has been prepared from a hydrothermal approach and was characterized by IR analysis and X-ray diffraction. Its crystal structure consists of discrete 4,5-imidazole-dicarboxylate, H2O and piperazine molecules. The whole structural motif was assembled by three different non-covalent interactions of O-H…O, N-H…O and π-π stacking, which play an important role in packing the molecules. Interestingly, the connections between imidazole-4,5-dicarboxylate molecule and water molecule result in a helical polymeric chain. Crystal data for compound 1： monoclinic system, space group P21/c, a = 6.4600（13）, b = 19.910（4）, c = 6.9123（14） A^°, β = 94.26（3）°, V= 886.6（3） A^°^3, Z= 4, C7H10O5N3, Mr = 216.18.展开更多
Nano porous polymer film with a hexagonal colum nar(Coln)structure was fabricated by templated hydroge n-bonding discotic liquid crystals containing methacrylate functional group.The supramolecular hydrogen-bonded com...Nano porous polymer film with a hexagonal colum nar(Coln)structure was fabricated by templated hydroge n-bonding discotic liquid crystals containing methacrylate functional group.The supramolecular hydrogen-bonded complex T3Ph-L is composed of a 1,3/5-tris(1Hbenzo[d]imidazol-2-yl)benzene(T3Ph)core molecule as the hydrogen-bonding acceptor and 3,4,5-tris((11-(methacryloyloxy)undecyl)oxy)benzoic acid(L)peripheral molecules as donors.And the Colh structure is always retained after self-assembly,photo-crosslinking,and removal of the template T3Ph.The nanoporous polymer film can retain the Colh phase even under the dry condition,which indicates more possibilities for practical applicati ons.After chemical modificati on of the inner wall of the nano pores,the nan oporous polymer film with pores of about 1 nm selectively adsorbs ionic dyes,and the adsorption process is spontaneous and exothermic in nature.Homeotropic alignment can be obtained when the blend complex was sandwiched between two modified glasses after annealing by slow cooling,which shows that the nanoporous polymer film has potential in applications such as nanofiltration.展开更多
基金supported by National Natural Science foundation(No.20674005)Program of National High Technology 863 program of China(No.2006AA03Z108)Science and Technology Program of Beijing,China (No.Y0405004040121)
文摘Two series of novel cholesteryl-containing H-bonded liquid crystals were prepared through facile self-assembly between cholesteryl isonicotinate （proton acceptor） exhibiting a monotropic cholesteric phase, and the 4-alkoxy-benzoic acid or 4-alkoxy cinnamic acid （proton donor）. It was found that the increase of the conjugate length as well as the terminal length can contribute to enhance the interaction of molecules and thus significantly influenced the thermal behaviors of H-bonded LCs. The cholesteric reflection spectra of the induced mesogenic complexes were located in the visible region with the color tuneable thermo-sensitivity, which could be used for display application.
文摘A stable Sc phase is formed through hydrogen bonding between side-chain aromatic acid groups of polysiloxane: Bending of polysiloxane with N-Acetyl Latimic acid (NAA) gives a chiral S c * phase; The influence of polymerism and hydrogen bond induction effect over mesophase is discussed. The influence of NAA over mesophase is studied.
文摘A new composite chiral liquid crystal containing L-amino acid derivatives was prepared and their liquid crystal properties were investigated. Results show that they could exhibit liquid crystal through hydrogen bonding.
基金supported by National Natural Science foundation(No.20674005)Program of National High Technology 863 program of China(No.2006AA03Z108)+1 种基金National Key Technology Program(No.2007BAE31B00)Key Program for Panel Display of 863 program of China(No.2008AA03A318)
文摘Two series of novel tolane-type liquid crystals （LCs） comprising of hydrogen-bonded organic acids were synthesized. The formation of dimerized H-bond LCs was confirmed by IR spectroscopy, and mesomorphic properties of the LCs were investigated by differential scanning calorimetry （DSC） and polarizing optical microscopy （POM）. It was found that the end groups of the liquid crystals as well as the unsaturated rigid core had effect on the mesomorphic properties.
基金support from the National Natural Science Foundation of China(51903207 and 51773169)Guangdong Basic and Applied Basic Research Foundation(2019B1515120093)+3 种基金Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province(2019JC-11)Priority Research and Development Foundations of Shaanxi Provincial Government(2018GY-174)Fundamental Research Funds for the Central Universities(No.310201911py010)Open Fund from Henan University of Science and Technology(2020-RSC02)。
文摘Polymer-dispersed liquid crystal(PDLC)films comprising polyvinyl alcohol(PVA)and liquid crystal monomer(LCM)were successfully obtained by the method of solution casting&thermal compressing.LCM was distributed orderly in PVA matrix by hydrogen bond interaction,to form PVA-LCM interpe net rating-layered networks.When the mass fraction of LCM was up to 35 wt%,the corresponding in-plane thermal conductivity coefficient(λ//)of PDLC film was significantly increased to 1.41 W m^(-1)K^(-1),about 10.8 times that of neat PVA(0.13 W m^(-1)K^(-1)).High intrinsicλ//values of PDLC films were mainly attributed to the formed microscopic-ordered structures from ordered stacking of LCM,ordered arrangement of PVA chains,and their hydrogen bond interaction.This work would offer a new way to design and prepare novel intrinsic high thermal conductive polymers.
基金Financially supported by NNSFC (No. 20701014)NSFFPC (No. 2003 F006)the SRP Program of SCUT
文摘The compound （H3IDC）（Prz）0.5（H2O） （H3IDC = imidazole-4,5-dicarboxylate, Prz = piperazine） has been prepared from a hydrothermal approach and was characterized by IR analysis and X-ray diffraction. Its crystal structure consists of discrete 4,5-imidazole-dicarboxylate, H2O and piperazine molecules. The whole structural motif was assembled by three different non-covalent interactions of O-H…O, N-H…O and π-π stacking, which play an important role in packing the molecules. Interestingly, the connections between imidazole-4,5-dicarboxylate molecule and water molecule result in a helical polymeric chain. Crystal data for compound 1： monoclinic system, space group P21/c, a = 6.4600（13）, b = 19.910（4）, c = 6.9123（14） A^°, β = 94.26（3）°, V= 886.6（3） A^°^3, Z= 4, C7H10O5N3, Mr = 216.18.
基金the National Key R&D Program of China(No.2018YFB0703702)the National Natural Science Foundation of China(No.51725301).
文摘Nano porous polymer film with a hexagonal colum nar(Coln)structure was fabricated by templated hydroge n-bonding discotic liquid crystals containing methacrylate functional group.The supramolecular hydrogen-bonded complex T3Ph-L is composed of a 1,3/5-tris(1Hbenzo[d]imidazol-2-yl)benzene(T3Ph)core molecule as the hydrogen-bonding acceptor and 3,4,5-tris((11-(methacryloyloxy)undecyl)oxy)benzoic acid(L)peripheral molecules as donors.And the Colh structure is always retained after self-assembly,photo-crosslinking,and removal of the template T3Ph.The nanoporous polymer film can retain the Colh phase even under the dry condition,which indicates more possibilities for practical applicati ons.After chemical modificati on of the inner wall of the nano pores,the nan oporous polymer film with pores of about 1 nm selectively adsorbs ionic dyes,and the adsorption process is spontaneous and exothermic in nature.Homeotropic alignment can be obtained when the blend complex was sandwiched between two modified glasses after annealing by slow cooling,which shows that the nanoporous polymer film has potential in applications such as nanofiltration.
