国外有机氟产品物化性质数据汇编(四)

氟树脂B.G.Willovghby 将氟树脂分成四氟乙烯为基础的和非四氟乙烯为基础的两大类,后者又分成七个品种,计:PCTFE(聚三氟氯乙烯)PCTFE-VDF(聚三氟氯乙烯与偏氟乙烯)共聚物E-CTFE(乙烯-三氟氯乙烯)共聚物PVF(聚氟乙烯)PVDF(聚偏氟乙烯)PHFIB-VDF(六氟异丁烯-偏氟乙烯)共聚物FPE(氟化聚乙烯)以四氟乙烯为基础的,有:PTFE(聚四氟乙烯)FEP(四氟乙烯与六氟丙烯)共聚物     

氟树脂性能与加工应用(续22)

叙述了四氟乙烯-全氟代烷基乙烯基醚共聚物、聚偏氟乙烯、聚氟乙烯和聚三氟氯乙烯等几种热熔流动氟树脂成型加工的特性、原理、方法和工艺。     

编者按

正氟碳粉末涂料主要有2大类,一类是以偏氟乙烯聚物(PVDF)、乙烯-四氟乙烯共聚物(ETFE)、乙烯-三氟氯乙烯共聚物(ECTFE)等为基料的热塑性树脂氟碳涂料;另一类是近年来发展十分迅速的三氟氯乙烯(CTFE)/四氟乙烯(TFE)-乙烯基醚共聚物(FEVE)热固性树脂氟碳涂料。近年来,为降低氟碳涂料在成膜状态下有机挥发物(VOC)的释放量,工业界和学术界的众多研发团队开展了多元化的研究与尝试,国内水性、高固体分、可UV     

氟塑料的应用

介绍了常用氟塑料,如聚四氟乙烯、(乙烯／四氟乙烯)共聚物、(四氟乙烯／六氟丙烯／偏氟乙烯)共聚物、聚偏氟乙烯、三氟氯乙烯共聚物、(三氟氯乙烯／乙烯)共聚物、聚全氟乙丙烯等的性能、开发和应用情况,展望了其发展趋势。     

氟树脂性能与加工应用(续26)

叙述了聚偏氟乙烯、聚三氟氯乙烯、乙烯-四氟乙烯共聚物、乙烯-三氟氯乙烯共聚物和聚氟乙烯在各行业的应用。     

氟碳涂料研究进展

氟碳涂料是以含氟树脂为主要成膜物质的系列涂料，是在氟树脂基础上经过改性、加工而成的一种新型涂层材料，其主要特点是树脂中含有大量的F-C键。在受热、光(包括紫外线)的作用下，F-C键难以断裂，因此显示出超长的耐候性及耐化学介质腐蚀，其稳定性是所有树脂涂料中最好的，一般应用于建筑、桥梁、飞机和船舶等对耐候性要求很高的场合。本文主要概述了聚四氟乙烯（PTFE）涂料、聚偏氟乙烯（PVDF）涂料、氟烯烃与烷基乙烯基醚或酯的共聚物(FEVE)涂料、乙烯-四氟乙烯共聚物（ETFE）涂料以及乙烯-三氟氯乙烯共聚物（ECTFE）涂料等氟碳涂料的研究进展。     

1990—1991年国外氟塑料工业进展

介绍国外氟塑料工业进展。内容包括主要生产公司、生产能力和应用消费及其分配。对工业化氟树脂品种聚四氟乙烯、聚偏氟乙烯、聚全氟乙烯丙烯树脂和可熔性聚四氟乙烯树脂、四氟乙烯/六氟丙烯/全氟烷基乙烯基醚三元共聚物等产品开发和技术进展作了详细介绍。     

2019氟硅涂料行业年会暨20周年庆系列报导——氟碳涂料行业发展概况

<正>以含氟烯烃(如偏二氟乙烯、三氟氯乙烯、四氟乙烯等)为基本单元均聚或与其他单体进行共聚得到的聚合物称为氟碳树脂,以氟碳树脂为成膜物质的涂料称为氟碳涂料。氟碳树脂涂料发展经过热熔型[以聚四氟乙烯(PTFE)树脂为代表]→溶剂可溶型[以聚偏二氟乙烯(PVDF)树脂为代表]→常温/室温固化型[以三氟氯乙烯/四氟乙烯-乙烯基醚(酯)(FEVE)树脂为代表]→环保型氟碳涂料(水性、粉末和高固含)几个阶段。1938年,美国杜邦(Dupont)化学公司推出PTFE,商品牌号为特氟龙,广泛用作炊具等的不粘涂料。1965年美国Pen-     

三氟氯乙烯的应用概述

三氟氯乙烯主要用作聚合单体，制造氟树脂、氟橡胶以及氟塑料等。聚三氟氯乙烯的性能决定它在尖端技术和军事宇航领域、电子工业中等的应用。目前已经商业化生产的三氟氯乙烯共聚物有偏氟乙烯-三氟氯乙烯共聚物和乙烯-三氟氯乙烯共聚物等。三氟氯乙烯与氯仿或四氯化碳作用的调聚反应可用来制造氟氯油系列产品用于润滑、密封、耐腐隔离油、蜡等。与乙烯共聚生产F30，用于电线电缆。     

氟树脂性能与加工应用（续23）

叙述了乙烯-四氟乙烯共聚物和乙烯-三氟氯乙烯共聚物等热熔流动氟树脂成型加工的特性、原理、方法、工艺和设备。     

聚酮的合成与性质

介绍了以一氧化碳和乙烯为主要原料经过催化共聚合,合成聚酮共聚物的方法以及聚酮共聚物的主要物理、化学性能.与结构相似的聚乙烯相比,聚酮共聚物具有熔点高、黏附力强、较好的光和生物降解性能等优点.可利用共聚物主链上的羰基改性聚酮共聚物,制成功能高分子材料和具有光活性的高聚物.优异的物理、化学性能和便宜的原材料来源使得聚酮共聚物的研究和应用受到越来越多的关注.     

PEO-PPO-PEO嵌段共聚物在水溶液中的自组装行为及其应用

聚氧乙烯-聚氧丙烯-聚氧乙烯(PEO-PPO-PEO)嵌段共聚物是一类重要的非离子表面活性剂,在选择性溶剂中可以自组装成多种形貌的介观结构。对PEO-PPO-PEO嵌段共聚物在水溶液中自组装行为进行了综述,介绍了其自组装行为的实验研究技术;阐明了嵌段共聚物构型、分子量、温度、浓度、添加剂等因素对PEO-PPO-PEO嵌段共聚物聚集行为的调控和作用机理;介绍了嵌段共聚物自组装特性的热力学模型、分子模拟及计算机预报等研究方法和研究进展;重点介绍了PEO-PPO-PEO嵌段共聚物在介孔材料制备、药物载体、生物大分子分离、嵌段共聚物修饰等方面的应用。     

The Characterisation of Newly Developed and Promising Hydrolyzed Ethylene Vinyl Acetate Copolymers

The modification of ethylene vinyl acetate copolymers by hydrolysis yields a broad range of new ter-and copolymers with entirely improved chemical and physical properties, especially important for adhesion applications. An infra-red spectroscopic method was developed in order to achieve a fast and accurate identification of their basic parameter, the mol % vinyl-alcohol, which allows characterisation of the new polymers.     

The Adhesion Society Award for Excellence in Adhesion Science Sponsored by 3M

The modification of ethylene vinyl acetate copolymers by hydrolysis yields a broad range of new ter-and copolymers with entirely improved chemical and physical properties, especially important for adhesion applications. An infra-red spectroscopic method was developed in order to achieve a fast and accurate identification of their basic parameter, the mol % vinyl-alcohol, which allows characterisation of the new polymers.     

三氟氯乙烯-乙烯氟碳粉末涂料及其在化工重防腐领域中的应用

检测了三氟氯乙烯-乙烯(ECTFE)共聚物氟碳粉末涂料理化性能,与其他热塑性氟碳粉末涂料作了各种性能比较,介绍了其在化工重防腐蚀领域中的应用。     

Characterization of ethylene‐propylene copolymers with high‐temperature gradient adsorption liquid chromatography and CRYSTAF

Blends of linear polyethylene (PE) and isotactic polypropylene (iPP) with different average molar masses and a series of ethylene‐propylene (EP) copolymers with different chemical composition as well as blends of PE, Ipp, and EP copolymers were separated using a carbon‐column packing (Hypercarb®) and gradients of 1‐decanol or 2‐ethyl‐1‐hexanol → 1,2,4‐trichlorobenzene (TCB). The separation is based on full adsorption of linear PE on the carbon sorbent at temperature 160°C. However, iPP is not adsorbed and elutes in size exclusion mode. The random EP copolymers have been adsorbed in the column packing and separated according to their average chemical composition after application of the gradient starting with alcohol and ending with pure TCB. The elution volumes of the copolymers depended linearly on the average concentration of ethylene in the copolymers. The HPLC elution profiles were correlated with the CRYSTAF elution profiles. In contrast to CRYSTAF, fully amorphous polyolefin samples were separated with the high‐temperature adsorption liquid chromatography. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Green composites and blends from leather industry waste

Blends based on protein hydrolysate (PH), derived from waste products of the leather industry, and poly(ethylene‐co‐vinyl acetate) (EVA), were obtained by reactive blending and their physico‐chemical properties as well as their mechanical and rheological behavior were evaluated. The effect of vinyl acetate content and of a transesterification agent added to increase interaction between polymer and bio‐based components were investigated. Novel biodegradable polymeric materials for spray mulching coatings were also obtained from hydrolyzed proteins and end‐functionalized poly(ethylene glycol) (PEG), which was used as crosslinking agent. These products, almost entirely obtained from renewable sources, represent a new type of biodegradable material which looks promising for several applications, for instance in packaging or in agriculture as transplanting or mulching films with additional fertilizing action of PH. POLYM. COMPOS., 37:3416–3422, 2016. © 2015 Society of Plastics Engineers     

Influence of the longest ethylene and isotactic propylene sequences on crystallization elution fractionation of ethylene/propylene copolymers

Crystallization elution fractionation (CEF) is the newest crystallization-based technique for estimating the chemical composition distribution of ethylene/1-olefin copolymers. Understanding the separation mechanism of CEF for ethylene/propylene copolymers over their full compositional range is challenging because the crystallizabilities of the copolymer chains depend on the longest ethylene sequence and on longest isotactic propylene sequence. We developed a mathematical model to describe the CEF mechanism for ethylene/propylene copolymers over the entire compositional range using population balances for the crystallization and dissolution stages. The joint distribution of longest ethylene and isotactic propylene sequences determines how the copolymer populations crystallize and dissolve. The model was validated with experimental CEF profiles of ethylene/propylene copolymers varying from pure ethylene to propylene homopolymers.     

Synthesis and characterization of fluorescein isothiocyanate (FITC)-labeled PEO-PCL-PEO triblock copolymers for topical delivery

We present the synthesis of fluorescein isothiocyanate (FITC)-labeled poly(ethylene oxide)-block-poly(?-caprolactone)-block-poly(ethylene oxide) (PEO-PCL-PEO) triblock copolymers and their applications for tracking the penetration behavior of FITC-labeled copolymers in the hairless mouse skin. In the first step, PEO-PCL diblock copolymers with different ratios of PCL to PEO (i.e., [CL]/[EO]) were prepared by ring opening polymerization of ?-caprolactone (CL), where monomethoxy poly(ethylene glycol) (mPEG, M_n = 2000 g mol⁻¹) was used as a macro-initiator. FITC was successively reacted with octadecylamine, isophorone diisocyanate (IPDI), and then used as a linker to obtain PEO-PCL-PEO triblock copolymers from the PEO-PCL diblock copolymers. In aqueous solution, both FITC-labeled triblock copolymers show two UV absorption peaks at 489 and 455 nm, attributed to the monomeric FITC and H-aggregated FITC moieties, respectively. Due to the strong H-aggregation of FITC in the copolymer of high [CL]/[EO], fluorescent emission intensities considerably decreased at high concentrations of the copolymer. FITC-labeled copolymers exhibited more sharper polarized optical and fluorescence microscopic images compared to the mixtures of FITC and unlabeled copolymer in both solid crystalline and multiple emulsion state. Furthermore, the Frantz diffusion cell test was carried out to demonstrate the penetration behavior of the FITC-labeled copolymers in the hairless mouse skin.     

Synthesis and aggregation behavior of four types of different shaped PCL‐PEG block copolymers

Biodegradable, amphiphilic, linear (diblock and triblock) and star‐shaped (three‐armed and four‐armed) poly[(ethylene glycol)‐block‐(ε‐caprolactone)] copolymers (PEG–PCL copolymers) were synthesized by ring‐opening polymerization of ε‐caprolactone (CL) with stannous octoate as a catalyst, in the presence of monomethoxypoly(ethylene glycol) (MPEG), poly(ethylene glycol) (PEG), three‐armed poly(ethylene glycol) (3‐arm PEG) or four‐armed poly(ethylene glycol) (4‐arm PEG) as an initiator, respectively. The monomer‐to‐initiator ratio was varied to obtain copolymers with various PEG weight fractions in a range 66–86%. The molecular structure and crystallinity of the copolymers, and their aggregation behavior in the aqueous phase, were investigated by employing ¹H‐NMR spectroscopy, gel permeation chromatography and differential scanning calorimetry, as well as utilizing the observational data of gel–sol transitions and aggregates in aqueous solutions. The aggregates of the PEG–PCL block copolymers were prepared by directly dissolving them in water or by employing precipitation/solvent evaporation technique. The enthalpy of fusion (ΔH_m), enthalpy of crystallization (ΔH_crys) and degrees of crystallinity (χ_c) of PEG blocks in copolymers and the copolymer aggregates in aqueous solutions were influenced by their PEG weight fractions and molecular architecture. The gel–sol transition properties of the PEG–PCL block copolymers were related to their concentrations, composition and molecular architecture. Copyright © 2006 Society of Chemical Industry