Synthesis and characterization of poly(3-hexylthiophene)/poly(3-(trimethoxysilyl)propyl methacrylate) rod-coil block copolymers by using atom transfer radical polymerization

In this study, polythiophene based rod-coil block copolymers (P3HT)47-b-(PMSMA)34 are synthesized by atom transfer radical polymerization (ATRP). The effects of altering the mix of solvent and processing temperature on the morphologies and photophysical properties of the block copolymers in both solution and solid state are investigated. The chemical structure of the prepared block copolymers is confirmed by NMR and FTIR analysis. TEM results show that different morphologies of aggregates can be obtained by varying the toluene/methanol ratios. Such aggregation leads to a significant red shift on the optical absorption and photoluminescence spectra of the P3HT-b-PMSMA in mixed solvents. The results of AFM, UV-Vis, and PL show that the morphologies and photophysical properties of P3HT-b-PMSMA films are also significantly affected by the curing temperature. Blue shifts on the optical absorption and photoluminescence spectra are observed upon increasing the curing temperature.     

新型含杂萘联苯聚醚砜类嵌段共聚物的合成与性能研究

采用连续缩聚法合成氯端基聚醚砜齐聚物,然后与杂萘联苯构成的类双酚合成的羟端基齐聚物进行缩聚反应,合成了新型PPES-PES嵌段共聚物.用IR、DSC、TGA、X-WAXD等方法对聚合物进行了表征,并研究了聚合物的溶解性能.结果表明该嵌段共聚物具有较高的玻璃化转变温度,较好的热稳定性和良好的溶解性能,为非结晶型聚合物,并可浇铸得到透明、韧性高的薄膜.实验还发现聚醚砜组分含量变化对共聚物的热性能影响很大,对杂萘联苯聚醚砜改性效果明显.     

合成方法对聚(3-己基噻吩)立构规整度的影响

采用化学氧化法、格式反应法、GRIM (Grignard Metathesis Method)法和超声辅助GRIM法、合成了不同立构规整度的聚3-己基噻吩(P3HT).用GPC、紫外-可见光谱、红外光谱(FT-IR)和核磁共振谱(1 H-NMR)对P3HT的分子结构和立构规整度进行了表征.结果表明,GRIM法合成的P3...     

Synthesis and properties novel polyurethane-hexafluorobutyl methacrylate copolymers

Novel physically crosslinked polyurethane-hexafluorobutyl methacrylate (PU-M) copolymers were prepared by the macroiniferter-controlled radical polymerization method. The chemical structures of the PU-M copolymers were characterized by FT-IR, (1)H-NMR, GPC, DSC, and XPS. The self-assembly and surface properties of the PU-M copolymers have been investigated. The results revealed that PU-M copolymers have good hydrophobility, so the hydrophobility of polyurethane could be easily adjusted by controlling the content of the hydrophobic vinyl monomers. The mechanical evaluation shows that PU-M copolymers exhibit good mechanical properties. The effects of the fluorine content on the surface properties and self-assembly of the PU-M copolymers were investigated. The morphology of the PU-M copolymers' self-assembly was observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), and the mechanism of self-assembly was investigated. Antimicrobial property of the chlorinated PU-M copolymers against both Escherichia coli and Bacillus subtilis bacteria was examined and showed increase compared to that of pure polyurethane.     

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Abstract

Poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) were prepared by a reprecipitation method. Hydrothermal processing applied external pressure to the pristine P3HT NPs at temperatures ranging from 60 to 150 °C. Optical absorption and photoluminescence (PL) spectra for the hydrothermally treated P3HT NPs varied markedly with the processing temperature. With increasing treatment temperature, the absorption peak broadened and the peak position shifted from 510 to 623 nm; moreover, the intensity ratio of the 0–1 to 0–0 emission varied. These changes were caused by interactions between the P3HT main chains and alkyl side groups and conformational modifications induced by the high pressure during the hydrothermal process. The evolution of the optical absorption spectra of the P3HT NPs during the hydrothermal processing was strongly correlated with the variation of PL excitation spectra and with the PL emission spectra of a single NP.     

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) were prepared by a reprecipitation method. Hydrothermal processing applied external pressure to the pristine P3HT NPs at temperatures ranging from 60 to 150 °C. Optical absorption and photoluminescence (PL) spectra for the hydrothermally treated P3HT NPs varied markedly with the processing temperature. With increasing treatment temperature, the absorption peak broadened and the peak position shifted from 510 to 623 nm; moreover, the intensity ratio of the 0–1 to 0–0 emission varied. These changes were caused by interactions between the P3HT main chains and alkyl side groups and conformational modifications induced by the high pressure during the hydrothermal process. The evolution of the optical absorption spectra of the P3HT NPs during the hydrothermal processing was strongly correlated with the variation of PL excitation spectra and with the PL emission spectra of a single NP.     

聚3-己基噻吩的光电性能研究

利用光电化学方法研究了聚3-己基噻吩的光电化学性质,其禁带宽度为1.89eV,同时确定了它的价带位置(-3.6eV)、导带位置(-5.4eV).研究发现聚3-己基噻吩属于直接跃迁型半导体,在本文条件下得到的最高IPCE值达5.2%     

Electrochemical surface plasmon excitation and emission light properties in poly(3-hexylthiophene) thin films

The attenuated total reflection (ATR) and emission light properties utilizing surface plasmon (SP) excitations were measured for the electrochemical change of poly(3-hexylthiophene-2,5diyl) (P3HT) thin films in-situ. The SP emission light could detect the SP excited by molecular luminescence of P3HT. The ATR and SP emission light properties were observed for the doped–dedoped states of P3HT thin film. The ATR and SP emission light properties were remarkably changed with the electrochemical doping and dedoping. The SP emission light also decreased by decrease of the molecular luminescence of P3HT by doping. For the dedoped-state P3HT thin film, SP emission light also increased by increase of the molecular luminescence. The SP emission light excited by molecular luminescence can be controlled by the control of doping–dedoping state.     

Hole transport in organic field-effect transistors with active poly(3-hexylthiophene) layer containing CdSe quantum dots

Hybrid field-effect transistors (FETs) based on poly(3-hexylthiophene) (P3HT) containing CdSe quantum dots (QDs) were fabricated. The effect of the concentration of QDs on charge transport in the hybrid material was studied. The influence of the QDs capping ligand on charge transport parameters was investigated by replacing the conventional trioctylphosphine oxide (TOPO) surfactant with pyridine to provide closer contact between the organic and inorganic components. Electrical parameters of FETs with an active layer made of P3HT:CdSe QDs blend were determined, showing field-effect hole mobilities up to 1.1×10^?4 cm²/Vs. Incorporation of TOPO covered CdSe QDs decreased the charge carrier mobility while the pyridine covered CdSe QDs did not alter this transport parameter significantly.     

单分散聚甲基丙烯酸乙酯的制备与性能研究

活性阴离子聚合为聚合物分子设计和合成提供了一种有效方法.以1,1二苯基己基锂(DPHLi)为引发剂,添加LiClO4络合剂,采用活性阴离子聚合体系制备了单分散聚甲基丙烯酸乙酯(PEMA).考察了聚合温度、引发剂、添加剂等工艺参数对聚合反应的影响规律,并研究了不同pH值聚甲基丙烯酸乙酯的降解性能.     

有序Ag_(NW)@Au_(NP)复合纳米线的制备及其对聚(3-己基噻吩)荧光效应的影响

采用三相界面法及置换反应法,以氯金酸-乙醇溶液和无序Ag纳米线为原材料,在空白Si基底上成功制备出有序Ag纳米线(Ag_(NW))@Au纳米颗粒(Au_(NP))复合纳米线。采用场发射扫描电子显微镜(FESEM)和高分辨透射电子显微镜(HRTEM)对有序Ag_(NW)@Au_(NP)复合纳米线形貌进行了表征与分析,研究了氯金酸-乙醇溶液浓度和置换反应的反应时间对制备Ag_(NW)@Au_(NP)复合纳米线的影响,并且结合荧光光谱及激光拉曼光谱进一步研究了一系列有序Ag_(NW)@Au_(NP)复合纳米线对共轭聚合物聚(3-己基噻吩)(P3HT)荧光效应的影响。实验结果表明,有序Ag_(NW)@Au_(NP)复合纳米线上Au_(NP)的粒径随着置换反应时间的延长或氯金酸-乙醇溶液浓度的增加而增大,该复合纳米线对P3HT的荧光效应有增强作用,但其增强效应会随置换反应进行而减弱。     

Mechanical properties of blends of poly(methyl methacrylate) and poly(vinylidene fluoride)

The mechanical properties of blends of the crystallizable polymer poly(vinylidene fluoride) and the amorphous material poly(methyl methacrylate) have been investigated as a function of composition both for glassy amorphous materials and for partially crystalline materials. The data obtained were interpreted in terms of the molecular and super-molecular structure of the blends and in terms of their dynamic properties.The main conclusions were that the mechanical properties are not strongly dependent on details of the distribution of the two components in the material nor on the crystal modifications present. The mechanical properties were found to depend primarily on the location of the glass transition temperature relative to the elongation temperature and on the presence or absence of crystalline regions. The degree of crystallinity was found to play an important role in determining the properties only at lower values of this quantity. The advantage of these blends is that the important parameters, namely, the degree of crystallinity and the location of the glass transition temperature, can be adjusted at will by varying the composition appropriately. This allows well-defined variations of the mechanical properties to be achieved.     

含联萘基团的新型旋光性聚(氨酯-酰亚胺)的制备与表征

以旋光的联萘二酚(BINOL)、甲苯-2,4-二异氰酸酯(TDI)及均苯四甲酸酐(PMDA)为主要原料,采用二步法,合成了主链含有联萘基团的新型旋光性聚(氨酯-酰亚胺)(S-BPUI和R-BPUI),并考察该聚合物较佳的制备条件,且用红外光谱(IR)、紫外-可见光谱(Vis-UV)、圆二光谱(CD)、热重及差热分析(TG/DSC)等对BPUI结构和性能进行了表征.结果表明:较佳的合成条件为预聚时间为5h、温度为100℃;S-BPUI和R-BPUI旋光度最高可分别达到 45.5°和-40.4°,具有较高的旋光能力;S-BPUI和R-BPUI的玻璃化转变温度分别为259.3℃和251.6℃以上,热分解温度分别为299.5℃和306.6℃,显示了较好的热稳定性;特性粘度在0.1808～0.2445 dL/g内变化,耐溶剂性能较好.