A high-performance silicon-containing arylacetylene resin with conjugated naphthalene rings

2021 ◽  
pp. 095400832110359
Author(s):  
Manping Ma ◽  
Xiaotian Liu ◽  
Chuan Li ◽  
Qiaolong Yuan ◽  
Farong Huang
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Main Chain ◽  
Three Dimensional ◽  
Stacking Interactions ◽  
Thermal Stabilities ◽  
Processing Window ◽  
Good Solubility ◽  
Thermal Crosslinking ◽  
Crosslinking Reactions

2,7-Diphenyloxynaphthalene with large conjugated structure has been introduced into the main chain of silicon-containing arylacetylene resin and then poly(dimethylsilylene-ethynylenephenoxynaphthyloxyphenylene-ethynylene) ( m-PPNSA-MM) was synthesized. The m-PPNSA-MM resin shows good solubility and a wide processing window. A stable three-dimensional cross-linking network formed due to thermal crosslinking reactions of acetylene groups and intermolecular π–π stacking interactions after m-PPNSA-MM was cured through the process of 180°C/2 h + 220°C/2 h + 260°C/4 h. The flexural strength and modulus of the cured m-PPNSA-MM resin at room temperature are 49.2 MPa and 2.75 GPa, respectively. The cured m-PPNSA-MM resin show high thermal stabilities, the 5% temperature of weight loss ( Td5) reaches 560°C in nitrogen.

Synthesis and Characterization of Novel Fluorene-Based Poly(Imino Ketone)s

2011 ◽  
Vol 335-336 ◽  
pp. 1086-1089
Author(s):  
Lin Zhang ◽  
Guan Jun Chang ◽  
Lu Bin Miao ◽  
Run Xiong Lin
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Main Chain ◽  
High Glass Transition Temperature ◽  
Good Solubility ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ft Ir ◽  
Ether Ketone

Fluorene-based poly(imino ketone)s (PIKF) were designed and synthesized by reacting 1,4-Bis-(4-bromobenzoyl)-benzene and 9,9-bis(3-R-4-aminophenyl)fluorine (R: H, CH3 or F). The structures of the resulting polymers were characterized by FT-IR, 1H NMR spectroscopy and elemental analysis. The thermo and optical properties of PIKF were evaluated. Good solubility of PIKF in ordinary organic solvents such as THF and chloroform was confirmed. PIKF were amorphous at room temperature. No phase transition except for Tg was confirmed in the DSC analysis. PIKF displayed a high glass transition temperature (Tg > 215 °C) in comparison with commercially available poly(ether ether ketone) (PEEK Tg = 169 °C). The UV-vis absorption spectrum of polymers exhibited two absorption peaks around 271 nm and 369 nm; The fluorescence spectrum of the PIKF-1, 2 and PIKF-3 showed a maximum emission wavelength at 502 nm and 491 nm, respectively. These optical properties were probably related to the cardo structure of the fluorene moiety placed on the main chain.

scholarly journals A Hydrophobic Derivative of Ciprofloxacin as a New Photoinitiator of Two-Photon Polymerization: Synthesis and Usage for the Formation of Biocompatible Polylactide-Based 3D Scaffolds

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3385
Author(s):  
Kseniia N. Bardakova ◽  
Yaroslav V. Faletrov ◽  
Evgenii O. Epifanov ◽  
Nikita V. Minaev ◽  
Vladislav S. Kaplin ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bone Tissue Regeneration ◽  
Good Thermal Stability ◽  
Two Photon ◽  
Processing Window ◽  
Good Solubility ◽  
Low Cytotoxicity ◽  
First Time ◽  
High Absorption ◽  
Two Photon Polymerization

A hydrophobic derivative of ciprofloxacin, hexanoylated ciprofloxacin (CPF-hex), has been used as a photoinitiator (PI) for two-photon polymerization (2PP) for the first time. We present, here, the synthesis of CPF-hex and its application for 2PP of methacrylate-terminated star-shaped poly (D,L-lactide), as well a systematic study on the optical, physicochemical and mechanical properties of the photocurable resin and prepared three-dimensional scaffolds. CPF-hex exhibited good solubility in the photocurable resin, high absorption at the two-photon wavelength and a low fluorescence quantum yield = 0.079. Structuring tests showed a relatively broad processing window and revealed the efficiency of CPF-hex as a 2PP PI. The prepared three-dimensional scaffolds showed good thermal stability; thermal decomposition was observed only at 314 °C. In addition, they demonstrated an increase in Young’s modulus after the UV post-curing (from 336 ± 79 MPa to 564 ± 183 MPa, which is close to those of a cancellous (trabecular) bone). Moreover, using CPF-hex as a 2PP PI did not compromise the scaffolds’ low cytotoxicity, thus they are suitable for potential application in bone tissue regeneration.

scholarly journals A Highly Sensitive Electrochemical Glucose Sensor Based on Room Temperature Exfoliated Graphite-Derived Film Decorated with Dendritic Copper

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5067
Author(s):  
Jiaxin Tang ◽  
Luo Wei ◽  
Shuaijie He ◽  
Jihui Li ◽  
Ding Nan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
High Stability ◽  
Room Temperature ◽  
Glucose Sensor ◽  
Three Dimensional ◽  
Exfoliated Graphite ◽  
Highly Sensitive ◽  
Free Glucose ◽  
Good Catalytic Activity

An ultrasensitive enzyme-free glucose sensor was facilely prepared by electrodepositing three-dimensional dendritic Cu on a room temperature exfoliated graphite-derived film (RTEG-F). An excellent electrocatalytic performance was demonstrated for glucose by using Cu/RTEG-F as an electrode. In terms of the high conductivity of RTEG-F and the good catalytic activity of the dendritic Cu structures, the sensor demonstrates high sensitivities of 23.237 mA/mM/cm2, R2 = 0.990, and 10.098 mA/mM/cm2, R2 = 0.999, corresponding to the concentration of glucose ranging from 0.025 mM to 1.0 mM and 1.0 mM to 2.7 mM, respectively, and the detection limit is 0.68 μM. In addition, the Cu/RTEG-F electrode demonstrates excellent anti-interference to interfering species and a high stability. Our work provides a new idea for the preparation of high-performance electrochemical enzyme-free glucose sensor.

A one-dimensional zinc(II) coordination polymer with a three-dimensional supramolecular architecture incorporating 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole and adipate

2016 ◽  
Vol 72 (12) ◽  
pp. 1002-1006 ◽  
Author(s):  
Chun-Li Liu ◽  
Qiu-Ying Huang ◽  
Xiang-Ru Meng
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Main Chain ◽  
Three Dimensional ◽  
Coordination Geometry ◽  
Supramolecular Architecture ◽  
One Dimensional ◽  
Potential Applications ◽  
Metal Organic ◽  
The One

The synthesis of coordination polymers or metal–organic frameworks (MOFs) has attracted considerable interest owing to the interesting structures and potential applications of these compounds. It is still a challenge to predict the exact structures and compositions of the final products. A new one-dimensional coordination polymer,catena-poly[[[bis{1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole-κN3}zinc(II)]-μ-hexane-1,6-dicarboxylato-κ4O1,O1′:O6,O6′] monohydrate], {[Zn(C6H8O4)(C9H8N6)2]·H2O}n, has been synthesized by the reaction of Zn(Ac)2(Ac is acetate) with 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole (bimt) and adipic acid (H2adi) at room temperature. In the polymer, each ZnIIion exhibits an irregular octahedral ZnN2O4coordination geometry and is coordinated by two N atoms from two symmetry-related bimt ligands and four O atoms from two symmetry-related dianionic adipate ligands. ZnIIions are connected by adipate ligands into a one-dimensional chain which runs parallel to thecaxis. The bimt ligands coordinate to the ZnIIions in a monodentate mode on both sides of the main chain. In the crystal, the one-dimensional chains are further connected through N—H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the title polymer exhibits fluorescence, with emissions at 334 and 350 nm in the solid state at room temperature.

Three-dimensional flower-like Mg(OH)2@MoS2 nanocomposite: fabrication, characterization and high-performance sensing properties for NOx at room temperature

2017 ◽  
Vol 41 (20) ◽  
pp. 12071-12078 ◽  
Author(s):  
Jiameng Kang ◽  
Muhammad Ikram ◽  
Yiming Zhao ◽  
Jiawei Zhang ◽  
Afrasiab Ur Rehman ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Three Dimensional ◽  
Sensing Properties

A three-dimensional (3D) flower-like hierarchical Mg(OH)2@MoS2 nanocomposite was fabricated using ordinary hydrothermal technology.

A new two-dimensional cadmium coordination polymer with 1H-imidazole-4-carboxylate and oxalate

2012 ◽  
Vol 68 (7) ◽  
pp. m177-m180 ◽  
Author(s):  
Xia Yin ◽  
Song-Liang Cai ◽  
Sheng-Run Zheng ◽  
Jun Fan ◽  
Wei-Guang Zhang
Keyword(s):  
Title Compound ◽  
Room Temperature ◽  
Three Dimensional ◽  
Stacking Interactions ◽  
Two Dimensional ◽  
Supramolecular Framework ◽  
Oxalate Anion ◽  
Dimensional Network ◽  
Distorted Octahedral ◽  
Octahedral Configuration

The title compound, poly[aqua(μ2-1H-imidazole-4-carboxylato-κ3N3,O:O′)hemi(μ2-oxalato-κ4O1,O2:O1′,O2′)cadmium(II)], [Cd(C4H3N2O2)(C2O4)0.5(H2O)]n, exhibits a two-dimensional network. The CdIIcation is coordinated to one N atom and two carboxylate O atoms from two 1H-imidazole-4-carboxylate (Himc) ligands, two carboxylate O atoms from the bridging oxalate anion and one ligated water molecule; these six donor atoms form a distorted octahedral configuration. The oxalate anion lies on a centre of inversion. The Himc ligands connect the CdIIcations to form –Cd–Himc–Cd–Himc–Cd– zigzag chains, with a Cd...Cd separation of 5.8206 (6) Å along thebdirection, which are further linked by tetradentate oxalate anions to generate a two-dimensional herringbone architecture in theabplane. These layers are extended to form a three-dimensional supramolecular frameworkviaO—H...O and N—H...O hydrogen bonds and π–π stacking interactions. The solid-state photoluminscent behaviour of the title compound has been investigated at room temperature.

scholarly journals Room-temperature high-performance ammonia gas sensor based on hydroxyapatite film

2019 ◽  
Author(s):  
Mingxu Sun ◽  
Ziheng Li ◽  
Yuwei Gu ◽  
Shuang Wu ◽  
Xinchen Wang
Keyword(s):  
Gas Sensor ◽  
Indium Tin Oxide ◽  
High Performance ◽  
Room Temperature ◽  
Three Dimensional ◽  
Oxide Glass ◽  
Dimensional Network ◽  
Response And Recovery ◽  
Indium Tin Oxide Glass ◽  
Excellent Selectivity

A room-temperature high-performance ammonia (NH3) gas sensor based on hydroxyapatite (HAp) film with three-dimensional network structure was reported in this paper. The gas sensor was fabricated on the indium tin oxide glass (ITO) interdigital electrode via simple electrochemical deposition technique. The HAp film gas sensor shows good sensitivity, high reproducibility and excellent selectivity to NH3 gas under dry and relative humidity (RH) conditions at room temperature. The response and recovery time of the HAp film gas sensor to 1000 ppm NH3 gas are 23 s and 14 s under N2 (dry) condition, and are 4 s and 11 s under air (RH≈30) condition, respectively. The HAp film gas sensor has no considerable deviation in the 1000 ppm NH3 gas for 3 cycles under N2 (dry), and so is air (RH≈30) conditions. The HAp film gas sensor shows excellent selectivity to methanol, acetone and ethanol under N2 (dry) and air (RH≈30) conditions. Above all, two sensing mechanisms of the HAp film gas sensor to NH3 gas have been also researched in this work.

An electron diffraction study of the wholly aromatic copolyester Xydar

1989 ◽  
Vol 47 ◽  
pp. 340-341
Author(s):  
L. S. Li ◽  
P. H. Geil
Keyword(s):  
High Temperature ◽  
Electron Diffraction ◽  
High Performance ◽  
Room Temperature ◽  
Diffuse Reflection ◽  
Three Dimensional ◽  
Electron Diffraction Study ◽  
Molar Ratio ◽  
Temperature Structure ◽  
High Performance Resin

It was shown by electron diffraction that p-hydroxybenzoate/m-hydroxybenzoate copolymer (95/5) possesses a three dimensional order with two orthorhombic crystalline modifications coexisting at room temperature. During heating the orthorhombic modifications I and II transform to hexagonal lateral packing of the chains at 290°C and 350°C respectively. The electron diffraction pattern obtained at 350°C can be indexed by a hexagonal unit cell with parameters a = b = 10.74Å, c = 12.34Å, γ = 120°. The observed d-spacings of the reflections and indices are listed in Table I. When the sample was heated to 430°C - 470°C only one broad and diffuse reflection was observed on the equator, while the meridional reflections are still sharp. In order to find out if the high temperature structure of the p- and m-hydroxybenzoate copolymer (95/5) is a general feature for other wholly aromatic copolyesters we have studied a high temperature and high performance resin Xydar SRT 300, which is made from a 1:2:1 molar ratio of following monomers: p, p'-biphenol, p-hydroxybenzoic acid and terephthalic acid.

Copolymerization Modification of PPTA with 2,5-Furandicarboxylic Acid: Towards High-Performance Material with Enhanced Solubility

2017 ◽  
Vol 898 ◽  
pp. 2174-2180 ◽  
Author(s):  
Kai Ju Luo ◽  
Yan Wang ◽  
Jun Rong Yu ◽  
Jing Zhu ◽  
Zu Ming Hu
Keyword(s):  
High Performance ◽  
Chemical Structure ◽  
Room Temperature ◽  
Furan Ring ◽  
Polymer Network ◽  
H Nmr ◽  
Good Solubility ◽  
Enhanced Solubility ◽  
Ft Ir ◽  
Furandicarboxylic Acid

The preparation and characterizations of soluble copolymers poly (p-phenylene terephthamide-co-furandicarboxylic p-Phenylenediamine)(PPTA-co-PPF) by direct polycondensation was described. The chemical structure of polyamides was investigated by 1H NMR and FT-IR. The good solubility of copolymers in organic solvents was certified at room temperature. Their thermal stability and mechanical properties were observed by TGA and tensile testing and then compared with that of traditional high performance aromatic polyamides (PPTA and PMIA, for example, with trademarks of Kevlar® and Nomex®). The furan ring incorporated polyamide was expected to form thermal reversible cross-linked polymer network through D-A reaction.

scholarly journals Synthesis and Characterization of New Organosoluble and Thermally Stable Poly(thioether-amide)s Bearing Pyridine Subunit in the Main Chain

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Esmael Rostami ◽  
Maryam Bagherzadeh ◽  
Tahereh Alinassab ◽  
Maryam Mohammadpour ◽  
Masume Zangooei ◽  
...  
Keyword(s):  
Weight Loss ◽  
Glass Transition ◽  
Main Chain ◽  
Transition Temperatures ◽  
Thermal Stabilities ◽  
Glass Transition Temperatures ◽  
H Nmr ◽  
Good Solubility ◽  
Amorphous Structures

We report the synthesis of new polyamides containing 2,6-bis(2-thio-2-(4-carboxyphenyl)-1-oxo)pyridine subunit, under microwave irradiation using Yamasaki phosphorylation method. The solubility, thermal behavior, and viscosity of polyamides were evaluated. The structures of polymers have been characterized using IR and 1H NMR spectroscopy. These polyamides showed good solubility, viscosity, high thermal stability, and glass transition temperatures. Their viscosities and glass transition temperatures are in the range of 0.63–0.88 and 223–295°C, respectively. Thermal stabilities for 10% weight loss (T10) are 137–173°C and for 50% weight loss (T50) are in the range of 483–523°C. The study of surface morphology showed particle and amorphous structures.

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