非晶含氟聚合物薄膜的热稳定性

以TefonAF1600为原料，用旋涂法制备了非晶含氟聚合物（AF）薄膜，通过扫描电镜（SEM），傅立叶转换红外（FTIR）光谱和X射线光电子（XPS）光谱等手段对热退火前后的薄膜进行了表征，所得薄膜具有无针孔，较光滑和平整的表面，300℃退火后薄膜表面的均匀性进一步改善，AF薄膜的300℃以下具有良好的热稳定性，在400℃退火后CF3吸收峰强度稍有降低，在400℃退火后，其所含的CF3键合构型显著降低，CF2，CF等其它构型没有明显的变化，由于CF3基团的分解有少量无定型碳生成。     

具有自分层效应的环保型含氟环氧自分层涂层的制备与性能

采用具有优异拒水拒油表面性能的环保型“伞形”结构短氟碳链含氟聚合物与在极性基材上附着力强的环氧树脂共混,通过自分层技术,获得能一次涂装成型的梯度含氟涂层。采用接触角测试、X射线光电子能谱和能谱详细研究了自分层形成的梯度结构及分层机理;考察了溶剂选择、基材、树脂配比、分层时间和固化温度等因素对涂膜分层和涂膜性能的影响。研究表明,当静置分层时间为3h,固化温度为80℃,基材为极性基材(马口铁和玻璃板)时,该环保型自分层涂层既具有含氟聚合物的优良表面性能,又兼具环氧树脂的优异附着力。此方法为涂层材料既保持强附着力又实现表面优异的拒水拒油功能,提供了一条新的思路和途径。     

含氟聚合物胶粘剂及其电化学特性的研究

为了研究锂离子电池用含氟胶粒剂并了解其电化学特性,采用差热力析（ＤＴＡ）、扫描电镜（ＳＥＭ）以及三电极（加参比电极）实验电池充放电循环等手段,对锂离子电池电极材料成型用的昌氟聚合物胶粘剂的配方、胶层干燥（熔结）方法、胶层的粘接强匿、耐电解质性能以及该胶粘剂作为粘结别的石墨电极的电化学特性等进行了研究。研穷结果表明：以聚偏氯乙烯为基料溶解于Ｎ－甲基吡咯烷酮或二甲基乙酰胺的胶粘剂有较好的粘合力,对铜片的粘合剪切强度为７．１ＭＰａ－８．３ＭＰａ,对铝片的粘合剪切强匿为１．５ＭＰａ－１．８ＭＰａ。通过ＤＴＡ法测定聚偏氟乙烯的熔融温度,确定了上述胶粘剂的干燥熔结果件为６０℃×４ｈ＋１８０Ｃ×１０ｍｉｎ。干燥烧结后的粘结试样经电解液（ＥＣ＋ＤＥＣ）浸泡７天后,粘合强度的保持率为初始的３３％。用该胶粘剂制成石墨电极并装配成实验电池进行充放电实验,经过１０次充放电循环后,其平均比容量为１９５ｍＡｈ／ｇ。     

非全氟聚合物热稳定性的改善

非全氟聚合物在成型温度条件下要发生降解,最经济、最直接的方法是通过添加热稳定剂来提高加工时的热稳定性,使制品的机械性能不下降,制品外观好.介绍了几种非全氟聚合物热稳定剂及其效果.     

Modifying and managing the surface properties of polymers

An ongoing challenge in polymer science is the preparation of materials with bespoke surface properties which differ from that of the bulk, for example hydrophobicity, wettability, chemical resistance, adhesion or biocompatibility. We highlight here recent efforts in the design, development and application of (multi)end‐functionalized polymers as additives for the efficient modification of polymer surface properties. Aryl‐ether moieties bearing up to eight functional groups have been used as initiators for the controlled polymerization of both styrene and methyl methacrylate by atom transfer radical polymerization (ATRP) and of lactide by ring opening polymerization (ROP). The resulting polymers have been used as additives to modify the surfaces of the corresponding bulk polymers. Fluorinated polymer surfaces are particularly appealing in terms of their liquid repellence, chemical inertness and low coefficient of friction. When an additive consisting of a low molecular weight polystyrene chain, end‐capped with four C₈F₁₇ groups, is present in a matrix of polystyrene at levels as low as 0.1%, near polytetrafluoroethylene‐like surface properties result. Copyright © 2007 Society of Chemical Industry     

聚甲基丙烯酸2,2,3,3-四氟丙醇酯的合成

合成了单体甲基丙烯酸2,2,3,3-四氟丙醇酯,并用明胶和十二烷基苯磺酸钠作为分散剂,通过悬浮聚合法合成了此单体的均聚物。采用激光粒径分布仪、光学显微镜、差示扫描量热仪、广角X射线衍射仪等表征了聚合物性能。结果表明,所得聚合物颗粒圆滑,粒径分布在1．2～187．3μm,且呈现双分布;聚合物玻璃化转变温度为74．2℃,熔体流动性较差;聚合物具有好的憎水、憎油性能和耐酸碱性能。     

含氟聚合物新产品的开发与应用

介绍了氟树脂和氟橡胶二大类含氟聚合物在新产品开发与应用方面的最新动向,从聚合工艺、后处理、物理或化学改性及加工方式等各种途径,提高产品性能,并介绍了新产品在应用方面的前景     

热塑性聚氨酯/特氟龙无定形氟聚物超疏水纳米纤维膜制备及其性能

针对纳米纤维膜力学性能低和疏水性较差的问题,首先采用静电纺丝法制备热塑性聚氨酯(TPU)纳米纤维膜,然后通过浸渍特氟龙无定形氟聚物(AF)溶液获得TPU/特氟龙AF超疏水纳米纤维膜,借助扫描电子显微镜、电子万能试验仪、视频接触角张力仪等探究了浸渍质量分数、浸渍时间对纳米纤维膜疏水性及力学性能的影响。结果表明:当特氟龙AF溶液质量分数为6%时,该纳米纤维膜水接触角大于150°,油接触角小于3°,展现出超疏水性;该纳米纤维膜的力学强度不受浸渍的影响,弹性模量可达到5.09 MPa,在过滤介质、生物医学领域等具有良好的潜在应用价值。     

含氟聚合物不稳定端基形成机理及稳定化处理

介绍了含氟聚合物常见不稳定端基的形成方式和机理以及如何避免和稳定化处理的几种方法,以避免含氟聚合物分子链中的不稳定端基对加工及成品性能带来不利影响.在不稳定端基后处理方法中,氟化方法效果最好,热处理方法其次,甲酯封端法稍差些.为了有效地实现端基稳定化,须将聚合和稳定化后处理结合起来.     

Stereoregular fluoropolymers: 5. The ring-opening polymerization of 2-trifluoromethylbicyclo-[2.2.1]hepta-2,5-diene

2-Trifluoromethylbicyclo[2.2.1]hepta-2,5-diene undergoes metathesis ring-opening polymerization under the influence of the initiators WCl₆/(CH₃)₄Sn, MoCl₅/(CH₃)₄Sn, OsCl₃, RuCl₃, IrCl₃ and ReCl₅. Analysis of the infrared and high-field ¹³C-n.m.r. spectra of the different polymers leads to the following conclusions: the Mo based initiator gives predominantly trans-vinylene units; the Re based system shows the greatest tendency towards stereoregulation and gives predominantly cis-vinylenes; and the other catalysts are unselective in this respect. 2-Trifluoromethylbicyclo[2.2.1]hepta-2,5-diene is more readily polymerized than its 2,3-bis(trifluoromethyl) analogue; both monomers display no vinylene stereoselectivity with the very reactive W based initiator, whereas with both Mo and Ru based initiators the disubstituted monomer displays significantly greater trans-vinylene selectivity.