聚对苯二甲酸乙醇酯和聚对苯二甲酸丁二醇酯化学扩链反应

综述了用于聚对苯二甲酸乙二醇酯和聚对苯二甲酸丁二醇酯聚对苯二甲酸丁二醇酯化学扩链反应的羧基加成型和羟基加成型扩链剂，以及缩合型扩链反应，羧基加成型扩链反应和羟基加成型扩链反应、羟羟基同时加成型扩链反应。     

不同拉伸比PET／PBT共混纤维的热行为及力学性能

不同拉伸比ＰＥＴ／ＰＢＴ共混纤维的热行为及力学性能尹秀丽（天津纺织工学院材料科学系天津３００１６０）关键词聚对苯二甲酸乙二醇酯，聚对苯二甲酸丁二醇酯，共混纤维，热行为，力学性能不同配比聚对苯二甲酸乙二醇酯（ＰＥＴ）／聚对苯二甲酸丁二醇酯（ＰＢＴ）共混...     

聚丙烯／聚对苯二甲酸乙二酯共混自增强材料的研究

聚丙烯／聚对苯二甲酸乙二酯共混自增强材料的研究陈鸣才，黄玉惠，赵树录，廖兵，林果，丛广民（中国科学院广州化学研究所广州５１０６５０）关键词聚丙烯，聚对苯二甲酸乙二酯，高分子共混物，自增强材料聚对苯二甲酸乙二酯（ＰＥＴ）具有良好的成纤性和透明性，但收缩...     

聚对苯二甲酸乙二醇酯和聚对苯二甲酸丁二醇酯化学扩链反应

综述了用于聚对苯二甲酸乙二醇酯（ＰＥＴ）、聚对苯二甲酸丁二醇酯（ＰＢＴ）化学扩链反应的羧基加成型和羟基加成型扩链剂，以及缩合型扩链反应、羧基加成型扩链反应和羟基加成型扩链反应、羧羟基同时加成型扩链反应。讨论了扩链反应、反应特性和扩链产物的性能，并简要介绍了国内研究概况。参考文献２０篇。     

多嵌段聚醚-酯共混物的微相结构与血液相容性研究

本工作合成了两种性质不同的聚醚-酯多嵌段共聚物,一种是以聚对苯二甲酸乙二酯为硬链段,聚乙二醇(PEGT)为软链段的亲水性多嵌段共聚物,另一种是以聚对苯二甲酸乙二酯为硬链段,聚四亚甲基醚二醇(PTMGT)为软链段的疏水性多嵌段共聚物。将两种共聚物以一定的比例共混,制备多嵌段聚醚-酯共混物。 改变共混物的组成,研究其微相结构与血液相容性的关系。采用动态力学谱(VES)、示差扫描量热(DSC)、透射电镜(TEM)和扫描电镜(SEM)等测定共混物的微观结构,采用微球柱法评价共混物的血液相容性。实验结果表明:材料的微观非均相结构及亲水平衡是决定血液相容性的重要因素。     

对-乙酰氧基苯甲酸与聚对苯二甲酸乙二醇酯共缩聚反应及醚键形成的研究

监测了对-乙酰氧基苯甲酸与聚对苯二甲酸乙二醇酯(PET)共缩聚反应过程中1HNMR图谱及特性粘度的变化,对乙酰氧基酯交换反应及乙酰脂肪酯的反应活性进行了研究。并研究了以低分子量PET或对苯二甲酸二乙二醇酯为原料时反应中醚键的形成及其进入共聚酯链的规律性。     

双■唑啉化合物偶联聚酯的研究Ⅰ．双■唑啉化合物的合成及其性能

双唑啉化合物偶联聚酯的研究Ⅰ．双唑啉化合物的合成及其性能＊陈玉君杨始方方土游飞越潘鉴元（中山大学高分子研究所广州５１０２７５）关键词双唑啉，扩链剂，聚酯聚酯，包括聚对苯二甲酸乙二酯（ＰＥＴ）和聚对苯二甲酸丁二酯（ＰＢＴ）等的高性能化，要求提高其...     

聚对苯二甲酸丁二醇酯二聚体热降解机理的理论研究

采用密度泛函理论(DFT)方法 M06-2X/6-311G(d)研究了聚对苯二甲酸丁二醇酯(PBT)二聚体的热降解机理,对PBT二聚体热解过程设计了八条可能反应路径,计算了每条反应路径的各基元反应步的热力学及动力学参数。计算结果表明,在PBT初始热解过程中,主链发生协同反应的反应能垒明显低于自由基反应的能垒,因此,通过协同反应生成的对苯二甲酸、对苯二甲酸单丁烯酯、对苯二甲酸二丁烯酯和二对苯二甲酸-1,4-丁二酯是PBT初始热解主要产物。主链通过六元环过渡态进行的协同反应的反应能垒低于通过四元环过渡态的,PBT主链的断裂主要通过六元环过渡态的协同反应而进行。此外,还讨论了PBT主要产物的二次降解反应,研究发现,在二次降解反应过程中主要以协同反应为主,生成1,3-丁二烯、四氢呋喃、苯、CO₂、苯甲酸等主要产物。     

纳米SiO2表面上的聚对苯二甲酸丁二醇酯预聚物接枝改性

纳米SiO2表面上的聚对苯二甲酸丁二醇酯预聚物接枝改性;纳米粒子; 表面改性;接枝; 聚对苯二甲酸丁二醇酯     

PET伸直链结晶体的研究进展

对聚对苯二甲酸乙二醇酯（PET）在特定的结晶条件下是否生成伸直链晶体进行了论证，系统总结了伸直链晶体形成的证据，并讨论了PET伸直链晶体形成的机理。     

Investigation of the epoxide–carboxylic acid reaction in model compound and polymerization reactions

The reaction of epoxide and acid has been studied in the model reaction of bisphenol-A diglycidyl ether and acetic acid with several base catalysts at 60, 95, and 115°C. The results suggest that no greater than 5% side reactions occur. A series of polyhydroxylester polymers were prepared from bisphenol-A diglycidyl ether and adipic acid. The polymers gel rapidly upon heating at 200°C. Terpolymers of bisphenol-A diglycidyl ether, bisphenol-A, and azelaic acid were prepared. These also gel at 200°C when 50 mole-% of the active hydrogen reactant is azelaic acid.     

Preparation of perfluoro-1,3-propanedisulfonic acid/silica nanocomposites-encapsulated low molecular weight aromatic compounds possessing a nonflammable characteristic

Perfluoro-1,3-propanedisulfonic acid/silica [PFPS/SiO(2)] nanocomposites were prepared by the sol-gel reactions of the corresponding disulfonic acid [PFPS] with tetraethoxysilane and silica nanoparticles under alkaline conditions. These fluorinated nanocomposites thus obtained can exhibit no weight loss behavior corresponding to the contents of PFPS in the composites after calcination at 800°C, although the parent PFPS can decompose completely around 270°C. In addition, we succeeded in encapsulation of a variety of low molecular weight aromatic compounds such as bisphenol-A, bisphenol-AF, bisphenol-F, 4,4'-biphenol and 1,1'-bi-2-naphthol into PFPS/SiO(2) nanocomposite cores. (1)H MAS NMR spectra, UV-vis spectra, fluorescence spectra and HPLC measurements of PFPS/SiO(2) nanocomposites-encapsulated bisphenol-A showed the presence of encapsulated bisphenol-A in the composites before and even after calcination at 800°C. Interestingly, it was verified that fluorescence spectra of PFPS/SiO(2) nanocomposites-encapsulated bisphenol-A after calcination at 800°C can exhibit an extremely red-shifted and enhanced fluorescence peak, compared to that before calcination or parent bisphenol-A.     

Synthesis and Flammability of Bromine-Containing Polybutadiene

COOH-terminated polybutadiene has been converted into COCl-terminated polybutadiene which was further chemically cross-linked with bisphenol-A and tetrabromobisphenol-A. The flammability characteristics of bisphenol-A and tetrabromobisphenol-A resins have been examined using thermogravimetric, ignition temperature and mass burning rate data. Mass burning rate results support that tetrabromobisphenol-A cross-linked polybutadiene is flame retardant compared to the corresponding non brominated compositions.     

Electron ionization and chemical ionization fragmentation of o/p isomers of bisphenol-A with tandem mass spectrometry

The fragmentation of o/p isomers of bisphenol-A was examined by using collisionally activated decomposition and the tanden mass spectrometric techniques. Also chemical ionization was performed using methane, isobutane and ammonia. The o/p position of the hydroxy groups in the bisphenol-A molecule directed the fragmentation both in electron and chemical ionization.     

AFM approach toward understanding morphologies in toughened thermosetting matrices

Atomic force microscopy, AFM, has been used for determining the microstructure of thermosetting matrices toughened by incorporation of core-shell particles and high-performance thermoplastics. A variety of systems has been considered in this work: one group is based on diglycidyl ether of bisphenol-A (DGEBA) epoxy matrix, and the other group is based on bisphenol-A dicyanate (DCBA) matrix. The studied epoxy systems were: DGEBA cured with an aromatic hardener, diamino diphenyl sulfone (DDS), and modified with polymethylmethacrylate (PMMA), or cured with a cycloaliphatic hardener, diamino dimethyl cyclohexylmethane (3DCM), and modified with core-shell particles of polystyrene-co-butylacrylate (PS-co-Bu). The DCBA-based matrices have been modified with polysulfone of bisphenol-A (PSU) or with polyetherimide (PEI). The influence of the modifiers and the curing conditions on the generated morphologies is reported as analysed by AFM in contact and tapping modes.     

Molten bisphenol-A polycarbonate-poly(ethylene terephthalate) blends. I. Identification of the reactions

This paper is devoted to the study of the reactions taking place in molten bisphenol-A polycarbonate-poly(ethylene terephthalate) mixtures. The analysis of the reaction products by infrared, proton and nuclear magnetic resonance spectroscopy, and by thermogravimetric analysis shows that the main reaction is an exchange reaction identical to that occurring in bisphenol-A polycarbonate-poly(butylene terephthalate) mixtures. However, some other reactions consecutive to this exchange reaction also take place, probably resulting from the instability of the ethylene carbonates produced by transesterification.     

Determination of alkylphenols and bisphenol-A. A comparative investigation of functional polymer-coated membrane microextraction and solid-phase microextraction techniques

A functional polymer (hydroxylated polymethacrylate) coated on porous polysulfone hollow fiber membrane (PS-HFM) was used as an adsorbent for the extraction of alkylphenols and bisphenol-A from seawater samples. Analyses of the extracts were performed using gas chromatography-mass spectrometry (GC-MS) after injection-port derivatization using bis(trimethylsilyl)trifluoroacetamide (BSTFA). We term the procedure as polymer-coated hollow fiber microextraction (PC-HFME). Owing to high porosity PS-HFM coated with hydroxylated polymer showed high extraction efficiency. Compared with solid-phase microextraction (SPME), PC-HFME showed good selectivity and sensitivity. Detection limits of alkylphenols and bisphenol-A ranged between 0.07 and 2.34 ng l(-1). The linearity range was from 0.01 to 15 microg l(-1) and the correlation coefficient (r) up to 0.997. The sensitivity and selectivity of the coated HFM could be potentially tuned by changing the characteristics of the coated hydroxylated polymer. The PC-HFME procedure was applied to the detection of alkylphenols and bisphenol-A in the coastal waters of Singapore.     

The rôle of oxygen in the photo-ageing of bisphenol-A polycarbonate

Most previous reports^1–19 on the photo-ageing of bisphenol-A polycarbonate suggest that the key mechanism in this phenomenon involves the photo-Fries reaction. In the work reported in this paper, the importance of O₂ in the photo-ageing of bisphenol-A polycarbonate was studied using a variety of uv light sources, including sunlight. Spectral analyses, product studies and oxygen uptake measurements indicate that photo-oxidation is a more important reaction pathway in polycarbonate photo-ageing than the photo-Fries reaction.     

Synthesis and thermal decomposition of a novel hyperbranched polyphosphate ester used for flame retardant systems

A novel hyperbranched polyphosphate ester (HPPE) was synthesized via the polycondensation of bisphenol-A as an A₂ monomer and phosphoryl trichloride as a B₃ monomer at 100 °C, without gelation. The initial molar ratio of A₂ to B₃ was set to be 1.5:1. The final product was precipitated from methanol. ³¹P NMR spectroscopy was used to monitor the reaction. The formed HPPE was characterized by FTIR and ¹H NMR to confirm its end groups. Differential scanning calorimetry data revealed that the cured bisphenol-A epoxy resin with HPPE as a curing agent possessed improved glass transition temperature. Dynamic mechanical thermal analysis also showed the increase in the glass transition temperature. The thermal degradation properties and flame retardancy were investigated by thermogravimetric analysis and limiting oxygen index (LOI). The results showed that the incorporation of HPPE into bisphenol-A epoxy resin increased its thermal stability and char yield during the decomposition by raising the second stage decomposition temperature. The LOI value increased from 23 to 31 when HPPE, instead of bisphenol-A, was used as a curing agent.     

Synthesis and matrix-assisted laser desorption/ionization time-of-flight characterization of bisphenol-A copolyformals containing nickel(II)/Schiff base, eicosane and 2-butene units in the main chain

Some bisphenol-A copolyformals, containing in the main chain different amounts of a Ni-diimine nonlinear optical (NLO)-chromophore, eicosane and/or 2-butene units, were synthesized by condensation reaction between dibromomethane and suitable mixtures of Ni(II)/Schiff base complex, 1,20-di(bisphenol-A)ether-eicosane and/or 1,4-di(bisphenol-A)ether-2-butene. Structural composition and thermal properties of polymeric materials were inferred by analyses by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS), nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and thermogravimetry (TG). MALDI-TOF data show that both Ni-diimine and unsaturated units are present in the copolyformals with a homogeneous arrangement in all the polymer mass range (GPC data). It has also been ascertained that the glass transition temperature (Tg) of the copolymers changes as a consequence of the abundance of aliphatic units in the macromolecules (DSC data). Cross-linking experiments of the copolymer at temperatures near the Tg value and under UV irradiation were also performed.