CN107828001A - 氟聚合物和包含氟聚合物的膜(iii) - Google Patents

氟聚合物和包含氟聚合物的膜(iii) Download PDF

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CN107828001A
CN107828001A CN201710819629.2A CN201710819629A CN107828001A CN 107828001 A CN107828001 A CN 107828001A CN 201710819629 A CN201710819629 A CN 201710819629A CN 107828001 A CN107828001 A CN 107828001A
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fluoropolymer
perforated membrane
solvent
film
mixture
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F·O·奥耶莫娃
H·艾特-哈多
Y·拉布瑞切
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Pall Corp
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Abstract

披露了具有低CWST值的氟聚合物和由该氟聚合物制备的多孔膜。该氟聚合物由聚合的式A‑X‑CH2‑B的单体单元组成，其中A为C6F13‑(CH2)2，X为O或S，和B为乙烯基苯基，以及该氟聚合物的重均分子量(Mw)为至少100Kd和/或玻璃化转变温度为至少33℃。该多孔膜适于使多种流体脱气。

Description

氟聚合物和包含氟聚合物的膜(III)
发明背景
包含氟聚合物的膜被考虑用于过滤许多流体，例如，用于除去流体中分散的气体。这些膜中的一些特征在于低表面能值或临界润湿表面张力(CWST)值和/或对有机溶剂和侵蚀性化学品的高耐受性。尽管这些膜有一种或多种优点，仍然需要具有改进的性能比如低CWST值和/或提高的对有机溶剂和/或侵蚀性化学品的耐受性的氟聚合物和包含这样的氟聚合物的膜。
发明概述
本发明提供了具有低CWST值的氟聚合物和由该氟聚合物制成的膜。在一种实施方案中，本发明提供了包含聚合的式A-X-CH2-B的单体单元的氟聚合物，其中A为C6F13-(CH2)2，X为O或S和B为乙烯基苯基，以及该氟聚合物的重均分子量(Mw)为至少100Kd和/或玻璃化转变温度为至少33℃。
该氟聚合物为超疏水聚合物并且可以用于赋予材料表面疏油性能，即CWST低达15达因/cm。本发明还提供了制备包含置于多孔载体上的所述共聚物的多孔膜的方法。本发明进一步提供了使流体，特别是含有溶于或分散于其中的气体的流体脱气的方法。例如，该多孔膜适于除去存在于流体中的浓度低于1ppb或低于大多数仪器的检测极限的气态杂质。
本发明的氟聚合物膜具有一种或多种以下优点：表面张力为15-23达因/cm的疏油膜由一步涂覆方法制造，无需膜的后处理。由该方法制造的疏油膜对酸、碱、氧化剂和/或热稳定。疏油膜保持至少80％的其孔隙率。该膜稳定地承受15mmHg的真空状态例如15小时或更长。聚合物浓度低达0.25％就能够制造表面张力值为23达因/cm的疏油膜。聚合物涂层可适于涂覆如不是所有的、也是许多的多孔载体膜和薄膜。不需要广泛的设备投资来流延膜，因为该方法采用现有的机器设备，只需要很少的或无需改型。本发明提供的均聚物当涂覆到膜上时具有23达因或更低的表面张力，无需膜的后处理。膜是多孔的，具有高水穿透压力和/或高空气流速。
附图说明
图1A描绘了水滴在依照本发明的实施方案的氟聚合物膜上的接触角。图1B描绘了IPA液滴在依照本发明的实施方案的氟聚合物膜上的接触角。
图2A描绘了水滴在依照本发明的实施方案的氟聚合物膜上的接触角。图2B描绘了IPA液滴在依照本发明的实施方案的氟聚合物膜上的接触角。
发明详述
依照一种实施方案，本发明提供了包含聚合的下式的单体单元的氟聚合物
A-X-CH2-B,
其中A为C6F13-(CH2)2，X为O或S和B为乙烯基苯基和该氟聚合物的重均分子量(Mw)为至少约100Kd和/或玻璃化转变温度为至少约33℃。
依照本发明，B为间-乙烯基苯基，对-乙烯基苯基，或它们的混合物。例如，该氟聚合物包含间-[全氟己基亚乙基硫代甲基]苯乙烯，对-[全氟己基亚乙基硫代甲基]苯乙烯，或它们的混合物，作为单体单元。在进一步实例中，该氟聚合物包含间-[全氟己基亚乙基氧基甲基]苯乙烯，对-[全氟己基亚乙基氧基甲基]苯乙烯，或它们的混合物。
在一种实施方案中，该氟聚合物的Mw为至少约100Kd，至少约400Kd，至少约600Kd，至少约800Kd，或至少约1000Kd。例如，该氟聚合物的Mw为约100-约4000Kd，优选约500-约1500Kd和更优选约1100-约1300Kd。
在一种实施方案中，该氟聚合物的数均分子量(Mn)为至少约60Kd，至少约200Kd，至少约400Kd，至少约600Kd，或至少约1000Kd。例如，该氟聚合物的Mn为约100-约2000Kd，优选约200-约1500Kd和更优选约400-约1400Kd，和在另一实施方案中约60-约1200Kd。
在任何以上实施方案中，该氟聚合物的多分散性指数(Mw/Mn)为约1.5-约5，约1.5-约4，或约1.5-约3。
在特定实施方案中，该氟聚合物的Mw为至少约98Kd。
该单体可以通过使C6F13-(CH2)2-Y与卤代烷基苯乙烯反应来制备，其中Y为SH或OH。
该氟聚合物可以由所述单体通过任何合适的方法制备。例如，可以采用自由基聚合聚合，特别是通过使用引发剂与自由基稳定剂结合。在一种实施方案中，该氟聚合物可以通过单体在约130℃-约180℃的温度下的自引发的热聚合来制备。
依照一种实施方案，使用(2,2,6,6-四甲基哌啶-1-基)氧基(TEMPO)进行聚合能够减慢聚合物链的生长速度和能够使较短链再组合，得到具有窄分子量分布的聚合物。
所述单体由全氟己基乙基硫醇、全氟己基乙基醇或它们的八个碳的氟化类似物以及氯甲基苯乙烯通过本文披露的特殊方法合成。本文披露的方法简化了单体和聚合物的合成及纯化，使其可用于工业应用。
合成所述单体及接下来的聚合物的优选方法如下：将263mmol的所述氟化硫醇和238mmol当量的氯甲基苯乙烯与100mL的DMF和33mL的8M氢氧化钠在500mL圆底烧瓶中混合。将反应混合物在室温搅拌1小时并在分液漏斗中分离。将所得产物蒸馏在140℃在2mbar，例如，具有85％收率。
该氟聚合物可溶于卤化溶剂，比如氯仿；二氯甲烷；1,2-二氯乙烷；1,1,1,3,3,3-六氟-2-丙醇；1,1,2-三氯-1,2,2-三氟乙烷和1,1,1,2,2-五氟-3,3-二氯丙烷。然而，这些溶剂中的一些可能是有毒性的或可能不能提供最佳的CWST值。
合适的溶剂的实例包括甲氧基丁烷，比如(CF3)2CF-CF2OCH3，CF3CF2CF2CF2OCH3，或它们的混合物，它们本身或与异丙醇(IPA)的组合。这样的溶剂是环境友好的。这些中的一些是作为工程化溶剂可商购的，例如，Novec 7100TM(甲氧基九氟丁烷)或NovecTM71IPA甲氧基九氟丁烷与IPA的组合，它们是环境友好的和危害较小的并且是优选的。
氟化溶剂或工程化溶剂的使用改进了该氟聚合物对多孔载体的粘结。
本发明进一步提供了包含上述氟聚合物的多孔膜，其中所述多孔膜是自立的(free standing)或置于多孔载体，例如多孔聚合物载体上。
在一种实施方案中，多孔聚合物载体选自PVC/PAN，聚砜，聚酰胺，纤维素，聚酯，聚醚砜，聚烯烃，例如，聚丙烯或聚乙烯，尤其是HDPE，PET，PPS，PPSU(聚苯基砜)，PTFE，PVDF，PVF(聚氟乙烯)，PCTFE(聚氯三氟乙烯)，FEP(氟化乙烯-丙烯)，ETFE(聚乙烯四氟乙烯)，ECTFE(聚乙烯氯三氟乙烯)，PFPE(全氟聚醚)，PFSA(全氟磺酸)，全氟聚氧杂环丁烷，聚酰亚胺，聚醚酰亚胺，聚碳酸酯和聚苯乙烯。
多孔膜是疏油的，并且在一种实施方案中，其CWST为约23达因/cm或更低，例如15-23达因/cm，尤其是15，16，17，18，19，20，21，22和23达因/cm。
多孔膜可以通过在多孔载体上聚合单体，例如通过聚合辐射比如UV或电子束来原位制备。或者和优选地，该多孔膜通过用该氟聚合物的溶液涂覆多孔载体来制备。
膜的CWST可以通过合适的方法测量。在一种实施方案中，所述方法依赖于一组特定组成的溶液。每种溶液具有特定表面张力。溶液表面张力值范围在15至92达因/cm，以小的非相等量递增。为了测量膜表面张力，将膜放在白光桌子上，将一滴某表面张力的溶液施加到所述多孔膜表面，记录液滴穿透所述多孔膜并作为光穿过所述多孔膜的指示的变成亮白色的时间。当液滴穿透所述多孔膜的时间为≤10秒时，认为是立即润湿。产生立即润湿的溶液限定多孔膜的CWST。如果时间>10秒，则认为溶液部分润湿所述多孔膜。
依照本发明的实施方案，所述多孔膜为这样的多孔膜，例如纳米多孔膜，例如，孔直径为1nm至100nm的多孔膜，或孔直径为1μm至10μm的微米多孔膜。
本发明的方面包括，但不限于：
a)多孔疏油膜，其得自用聚合物聚[p/m-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯和聚[p/m-[[(全氟己基亚乙基)氧基]甲基]-苯乙烯的一步表面涂覆，并且其表面张力为15-23达因/cm；
b)多孔疏油膜，其表面张力为15-23达因/cm，其得自用单体全氟己基亚乙基硫代甲基苯乙烯和全氟己基亚乙基氧基甲基苯乙烯进行表面涂覆，然后电子束能辐照以获得疏油表面；
c)多孔疏油膜，其得自用聚合物聚[p/m-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯和聚[p/m-[[(全氟己基亚乙基)氧基]甲基]-苯乙烯的一步表面涂覆，并且其表面张力为15-23达因/cm，并且进行涂覆后温度范围在20℃-150℃的干燥；和
d)一种改型的方法，其简化了可用于商业和工业应用的用于制备多孔膜的全氟己基亚乙基硫代甲基苯乙烯的合成以及后续的聚[p/m-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯的合成。
所述多孔膜可以以多种方式之一包含所述氟聚合物。例如，所述多孔膜可包括包含所述共聚物的涂层。所述多孔膜可以通过以下方式制备：将2％所述聚物溶解在合适的溶剂、例如丙酮中，并将多孔载体，比如PTFE浸泡在该聚合物溶液中2秒。将涂覆的载体在80℃在烘箱中干燥20分钟，并将产物浸泡在IPA中约2小时，在80℃在烘箱中干燥30分钟以获得所述多孔膜。测量表面张力和重量增加。PTFE载体和涂覆在该载体上的多孔膜表面的SEM显微照片分别描绘于图1-2。
膜可以是旋涂的、滴涂的、喷涂的、浸涂的或印刷涂覆的。涂覆也可以在无需用热进行附加干燥的情况下进行。然而，附加的干燥是优选的，因为例如它可以改进膜的牢固性。它能够稳定地承受负压，例如，至多15mm Hg。
依照本发明的实施方案，所述多孔膜可以具有许多构型，包括平面的、平片、褶皱的、管形的、螺旋的和中空纤维。在一种实施方案中，所述多孔膜为中空纤维膜。
根据本发明的实施方案的多孔膜典型地被置于外壳中，该外壳包含至少一个入口和至少一个出口，并限定该入口和该出口之间的至少一个流体流路，其中至少一个本发明的膜或包括至少一个本发明的膜的过滤器穿过该流体流路，以提供过滤器器件或过滤器模块。在一种实施方案中，过滤器器件提供为包含外壳，该外壳包含入口和第一出口，并限定该入口和该第一出口之间的第一流体流路；和至少一个本发明的膜或包含至少一个本发明的膜的过滤器，本发明的膜或包含至少一个本发明的膜的过滤器置于外壳中穿过该第一流体流路。
优选地，对于交叉流应用来说，至少一个本发明的膜或包含至少一个本发明的膜的过滤器置于外壳中，该外壳包含至少一个入口和至少两个出口，并限定至少在该入口和该第一出口之间的第一流体流路，和在该入口和该第二出口之间的第二流体流路，其中本发明的膜或包含至少一个本发明的膜的过滤器穿过该第一流体流路以提供过滤器器件或过滤器模块。在说明性的实施方案中，过滤器器件包含交叉流过滤器模块，外壳包含入口，包含浓液出口的第一出口，和包含渗透物出口的第二出口，和限定该入口和该第一出口之间的第一流体流路，和该入口和该第二出口之间的第二流体流路，其中至少一个本发明的膜或包含至少一个本发明的膜的过滤器设置穿过该第一流体流路。
过滤器器件或模块可为能消毒的。可采用具有合适的形状并提供入口和一个或多个出口的任何外壳。
外壳可以由任何合适的刚性不能渗透的材料制造，包括与被处理的流体相容的任何不能渗透的热塑性材料。例如，外壳可以由金属，比如不锈钢制造，或由聚合物，例如透明的或半透明的聚合物，比如丙烯酸类、聚丙烯、聚苯乙烯或聚碳酸酯树脂制造。
根据本发明的实施方案的多孔膜可以用于过滤空气和/或气体和/或可以用于使应用通气(例如，使空气和/或气体，而不是液体，穿过其中)。
根据本发明的实施方案的多孔膜还可以用于许多应用，包括，例如，诊断应用(包括，例如，样品制备和/或诊断横向流动器件)，喷墨应用，光刻，例如作为HD/UHMW PE基介质的替代品，用于制药工业的过滤流体，金属去除，生产超纯水，工业和地表水处理，用于医疗应用的过滤流体(包括家庭和/或患者使用，例如静脉应用，也包括例如过滤生物流体比如血液(例如病毒去除))，用于电子工业的过滤流体(例如用微电子工业和热SPM中的过滤光刻胶流体)，用于食品和饮料行业的过滤流体，啤酒过滤，澄清，过滤抗体和/或含蛋白质的流体，过滤含有核酸的流体，细胞检测(包括原位)，细胞收获和/或过滤细胞培养流体。根据本发明的实施方案的多孔膜可以用于许多器件，包括外科器件和产品，比如，例如，眼外科产品。脱气应用的实例为静脉(IV)流体的脱气。如果在注射前没有将IV流体适当地脱气，则它可以将空气拴引入巡环系统，这在某些情况下可以是致命的。
本发明的一种优选用途是涂覆多孔膜以在生物制药和医疗工业中进行通气应用。或者，疏油涂层可以用于抗结冰或用于疏冰表面，以及可以涂覆到玻璃纤维、金属和铝的表面，输电线，船体和机翼上。
非多孔膜可以使用聚合物聚[p/m-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯和聚[p/m-[[(全氟己基亚乙基)氧基]甲基]-苯乙烯以及它们的更高碳数的氟化类似物涂覆以实现具有高表面能的疏油表面。涂覆可以通过旋涂、滴涂、喷涂、浸涂或印刷涂覆进行。
以下实施例进一步说明本发明，但当日不应解释为以任何方式限制其范围。
实施例1
本实施例展示了依照本发明的实施方案的单体的制备。
制备p-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯PFOMS)：在3L反应器中将2-全氟己基乙基硫醇(1000g，2.63M)溶于在DMF(1L)，并将8M NaOH水溶液(330mL)在350rpm加入(放热的)，然后加入乙烯基苄基氯(364g，2.39M)。将反应混合物在80℃搅拌15小时。冷却后，将所得混合物使用2L分液漏斗分离(产物是密度较高的)。将H2O/DMF层用己烷(600mL)进一步萃取。将合并的有机层用7％碳酸氢钠水溶液洗涤，并将碳酸氢钠层用己烷(300mL)再萃取。将由此获得的产物用饱和氯化钠(1L)进一步洗涤，并用无水硫酸钠干燥。将产物通过二氧化硅凝胶(750g，在己烷中)过滤，并用用己烷(3L)洗脱。浓缩后，将获得的最终产物称重(1.115kg，2.25M，86％收率)。1H NMR(CDCl3，以ppm计)：δ2.25(m，2H)，2.60(d，2H)，3.70(s，2H)，5.25(d，1H)，5.75(d，1H)，6.69(dd，1H)，7.25(d，2H)，7.40(d，2H)。
实施例2
本实施例展示了依照本发明的实施方案的氟聚合物聚[p-[[(全氟己基亚乙基)硫代]甲基]苯乙烯](PST-S)的制备。
在2L烧瓶中将p-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯(1.115kg，2.25M)与甲苯(350g)和偶氮二异丁腈((AIBN)11g，674mmol，3mol％))混合，并且在0℃用氮气脱气45分钟。将反应混合物在60℃搅拌14小时。将所得产物在甲醇(9L)中在2小时内缓慢沉淀并混合另外1小时。将溶剂倾析，并将产物再溶于氯仿(2L)中，并在新鲜甲醇(15L)中再沉淀。混合5小时后，使用家用真空机将产物通过过滤漏斗或滤纸过滤，并用甲醇(500mL)漂洗。使产物在家用真空机下干燥1小时，并在真空炉中干燥过夜或在保持在30℃直到完全干燥。获得的聚合物重912g，按单体重量计82％收率。
实施例3
本实施例展示了依照本发明的实施方案的另一种氟聚合物聚[p-[[(全氟己基亚乙基)氧基]甲基]-苯乙烯]P(PFOMS)的制备。
将单体PFOMS(15.2g，31.7mmol)与2,2′-偶氮双(2-甲基丙腈)(AIBN)(207.7mg，1.23mmol)和四氢呋喃(THF)(7.5g，104mmol)一起加入250mL圆底烧瓶。在60℃搅拌12h后，将反应混合物倒入甲醇，并将获得的沉淀通过从溶剂NovecTM 71IPA到甲醇中的若干次沉淀来提纯。收率：85％。
表1列出了均聚物的玻璃化转变温度(Tg)。
表1.氟化聚合物的玻璃化转变温度
实施例4
本实施例展示了依照本发明的实施方案的涂覆工序。
将20nm、0.1μm、0.2μm、0.45μm或1μm的熔喷聚酯背衬的PTFE和未负载的PTFE膜切割成5英寸x 5英寸片材。将膜的几个片材置于不锈钢托盘上。将在氯仿、NovecTM 71IPA或NovecTM 7100中的聚合物浓度为0.5，0.75，1.0，1.5，2.0，2.5或3.0％的涂覆溶液倒入该托盘中并温和摇动，从而确保膜被涂覆溶液完全浸泡。将膜样品从浸泡溶液取出并在烘箱中在80℃干燥20min，然后测试膜性能。下表2显示了来自0.2μm聚酯背衬的PTFE膜的结果。
表2.空气流动速率，水穿透压力(psi)和CWST值
实施例5
本实施例展示了依照本发明的实施方案的亲油性膜的制备。
将具有0.1μm，0.2μm，0.45μm，1μm或5μm直径的孔的聚酯背衬的聚醚砜(PES)和未负载的PES膜切割成5英寸x 5英寸片材。将所述膜的几个片材置于不锈钢托盘中。将在NovecTM 71IPA或NovecTM7100中的聚合物浓度为0.5，0.75，1.0，1.5，1.75，2.0，2.25，2.5或3.0％的涂覆溶液倒入托盘中，并温和摇动，从而确保膜被涂覆溶液完全浸泡。将膜样品从浸泡溶液取出，并在烘箱中在70℃，80℃，90℃，100℃，120℃，或140℃干燥20min。下表2-4给出了所述膜在70℃和在120℃的测试结果。
实施例6
本实施例展示了依照本发明的实施方案的来自PVDF和尼龙膜的亲油性膜的制备。
将0.2μm、0.45μm、1μm或5μm孔直径的聚酯背衬的PVDF和未负载的尼龙膜或纤维素深度片材切割成5英寸x 5英寸片材。将膜的几个片材置于不锈钢托盘中。将在NovecTM71IPA或NovecTM 7100中的聚合物浓度为0.5，0.75，1.0，1.5，2.0，2.5或3.0％的涂覆溶液倒入托盘中，并温和摇动，从而确保膜被涂覆溶液完全浸泡。将膜样品从浸泡溶液取出，并在烘箱中在70℃、80℃、90℃、100℃、120℃或140℃干燥20min。下表6由这些膜在70℃的测试结果。
实施例7
本实施例展示了依照本发明的实施方案的来自尼龙、HDPE和PTFE膜的亲油性膜的制备。
将5nm孔直径的尼龙膜，5nm和10nm孔直径的PTFE膜以及5nm和10nm孔直径的HDPE膜切割成5英寸x 5英寸片材。将膜的几个片材置于不锈钢托盘中。将在NovecTM 7100中的聚合物浓度为0.4％的涂覆溶液倒入托盘中，并温和摇动10秒。将膜样品从浸泡溶液取出，并在烘箱中在130℃干燥20min。
表3.空气流动速率，水穿透压力(psi)和CWST值
表4.空气流动速率，水穿透压力(psi)和CWST值
表5.空气流动速率，水穿透压力(psi)和CWST值
表6.空气流动速率，水穿透压力(psi)和CWST值
表7.在聚醚砜和聚四氟乙烯膜上的p-[[(全氟己基亚乙基)硫代]甲基]-苯乙烯单体的聚合的电子束结果
所引用的所有参考文献，专利申请和专利在此通过引用并入本文，其程度如同每个参考文献被单独地和具体地指出通过引用并入，并且在这里被全部阐述。
在本发明(特别是在以下权利要求的上下文中)中使用术语“一”和“一(a)”和“一(an)”和“至少一个”以及类似的指示物应被解释为涵盖单数和复数，除非另有说明这里或明显与上下文相矛盾。使用术语“至少一个”后跟一种或多种项目的列表(例如，“至少一个A和B”)被认为是指从列出的项目(A或B)或列出的项目(A和B)中的两个或更多的任何组合，除非另有说明，这里或明确地与上下文相矛盾。术语“包含”、“具有”、“包括”和“包含”应被视为开放式术语(即，“包括但不限于”)，除非其明确指出。值的范围的引用仅用于作为简单地将每个单独的值引用到范围内的简写方法，除非另有说明，并将每个单独的值并入规范中，如同单独列举的那样。这里描述的所有方法可以以任何合适的顺序执行，除非本文明确指出或明确地与上下文相矛盾。提供这种使用任何和所有实施例或示范性语言(例如“比如”)，只是为了更好地阐明本发明，并不对本发明的范围构成限制，除非另有声明。说明书中的语言不应被解释为表明任何未要求保护的要素对本发明的实践至关重要。
本发明的优选实施方案描述在本文中，包括本发明人已知的用于实施本发明的最佳方式。这些优选实施方案的变化在阅读前面的描述后可以对本领域普通技术人员而言变得显而易见。发明人期望本领域技术人员适当地使用这种变化，并且本发明人打算以不同于本文具体描述的方式实施本发明。因此，本发明包括根据适用法律允许的所附权利要求中所述的所有修改和等同的主题。此外，上述要素在其所有可能的变体中的任何组合都包含在本发明中，除非本文明确地指出或上下文明显有矛盾。

Claims (18)

1.氟聚合物，其包含聚合的下式的单体单元
A-X-CH2-B，
其中A为C6F13-(CH2)2，X为O或S和B为乙烯基苯基，并且该氟聚合物的重均分子量(Mw)为至少100Kd和/或玻璃化转变温度为至少33℃。
2.权利要求1所述的氟聚合物，其中B为间位乙烯基苯基，对乙烯基苯基，或它们的混合物。
3.权利要求1或2所述的氟聚合物，其中所述单体单元为间-[全氟己基亚乙基硫代甲基]苯乙烯，对-[全氟己基亚乙基硫代甲基]苯乙烯，或它们的混合物。
4.权利要求1或2所述的氟聚合物，其中所述单体单元为间-[全氟己基亚乙基氧基甲基]苯乙烯，对-[全氟己基亚乙基氧基甲基]苯乙烯，或它们的混合物。
5.权利要求1-4中任一项所述的氟聚合物，其中该氟聚合物的Mw为至少200Kd。
6.权利要求1-5中任一项所述的氟聚合物，其中该氟聚合物的Mw为400-1300Kd。
7.权利要求1-6中任一项所述的氟聚合物，其中该氟聚合物的Mw为1100-1300Kd。
8.多孔膜，其包含权利要求1-7中任一项所述的氟聚合物。
9.权利要求8所述的多孔膜，其包括多孔载体。
10.权利要求9所述的多孔膜，其中所述多孔载体为多孔聚合物载体。
11.权利要求10所述的多孔膜，其中所述多孔聚合物载体选自PVC/PAN，聚砜，聚酰胺，纤维素，聚酯，聚醚砜，聚烯烃，PET，PPS，PPSU(聚苯基砜)，PTFE，PVDF，PVF(聚氟乙烯)，PCTFE(聚氯三氟乙烯)，FEP(氟化乙烯-丙烯)，ETFE(聚乙烯四氟乙烯)，ECTFE(聚乙烯氯三氟乙烯)，PFPE(全氟聚醚)，PFSA(全氟磺酸)，全氟聚氧杂环丁烷，聚酰亚胺，聚醚酰亚胺，聚碳酸酯和聚苯乙烯。
12.制备包含权利要求1-7中任一项所述的氟聚合物的多孔膜的方法，该方法包括：
(i)将该氟聚合物溶解在溶剂或溶剂的混合物以获得包含该氟聚合物的溶液；
(ii)将来自(i)的溶液涂覆在多孔载体中；和
(iii)从涂层蒸发所述溶剂或溶剂的混合物以获得该多孔膜。
13.权利要求12所述的方法，其中所述溶剂或溶剂的混合物包含卤化溶剂，其任选地与醇组合。
14.权利要求13所述的方法，其中所述溶剂或溶剂的混合物选自甲氧基九氟丁烷，甲氧基九氟丁烷，氯仿，二氯甲烷，1,2-二氯乙烷；1,1,2-三氯-1,2,2-三氟乙烷，1,1,1,2,2-五氟-3,3-二氯丙烷，任选地与异丙醇和/或1,1,1,3,3,3-六氟-2-丙醇组合。
15.多孔膜，其是通过权利要求12-14中任一项的方法制备的。
16.权利要求8-11或15中任一项所述的多孔膜，其CWST为15-23达因/cm。
17.过滤流体的方法，该方法包括将流体通过权利要求8-11、15或16中任一项所述的多孔膜。
18.权利要求17所述的方法，其中存在于所述流体中的气体被从所述流体去除。
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