丙烯腈系纤维

20074099丙烯腈系纤维Cox R.,Synthetic Fibers,2005,35,p.167(英)文章关于丙烯腈系纤维的聚合、加工、性能和结构。(薛敏敏)聚丙烯腈纤维加工纤维性能综述20074100高收缩聚丙烯腈纤维及起绒材料Ochi R.…;US-6863977(2004.6.28)(英)披露了一高收缩聚丙烯腈纤维,其由聚丙烯腈聚合     

碳纤维及无机纤维

TQ346.320061171单壁碳纳米管和丙烯腈为主的宏观纤维以及高模量纤维的制造Veedu S.T.…;US2004-180201(2004.9.16)(英)高模量宏观纤维包括单壁碳纳米管(SWNT)和丙烯腈聚合物。宏观纤维是截面尺寸≥1μm的拉伸纤维。丙烯腈聚合物-SWNT的复合纤维制造方法如下:将SWNT分散在溶剂中,如DMF或DMAc,掺混丙烯腈基聚合物,形成基本光学均匀的聚丙烯腈聚合物-SWNT浆液,将浆液纺成纤维,拉伸,干燥纤维。与没有SWNT的聚合物纤维相比较,聚丙烯腈/SWNT复合宏观纤维的模量较高,降低了收缩性。含10%SWNT的聚丙烯腈/SWNT复合纤维拉伸模量增…     

丙烯腈行情分析

丙烯腈主要生产聚丙烯腈纤维和改性聚丙烯腈纤维。此外,它还是ABS树脂、SAN树脂、丁腈橡胶、聚丙烯酰胺、丙烯酸酯类产品的主要原料。目前我国丙烯腈的主要生产厂家如表所示:     

红外光谱法鉴定合成纤维(Ⅱ)——腈纶氯纶和维纶的鉴定

<正> 一 聚丙烯腈系纤维的鉴定 聚丙烯腈系纤维包括阿克丽纶、克丽丝纶、奥纶、泽弗纶、腈纶、代纳尔以及维勒尔等。 各种聚丙烯腈系纤维组成的特点是都含有丙烯腈组份,在2230cm~(-1)有尖锐的吸收峰。这是其它品种纤维所不具有的。藉此可以鉴定丙烯腈系纤维。     

活性炭对聚丙烯腈功能纤维性能的影响

把活性炭与丙烯腈－氯乙烯共聚体共混制得纺丝溶液，以二甲基甲酰胺为溶剂湿法纺丝制造了吸附和阻燃双功能聚丙烯腈纤维。本文主要探讨了纤维中活性炭含量，羰粒径对纤维吸附性能和物理力学性能的影响。     

大分子抗菌剂前驱体共混改性聚丙烯腈纤维

通过水相沉淀聚合方法制备了3-烯丙基-5,5-二甲基己内酰脲/丙烯腈共聚物。将不同配比的共聚物和聚丙烯腈溶解于硫氰酸钠水溶液中配成纺丝液,采用两步法纺制了聚丙烯腈共混纤维。随共聚物含量增加,共混纤维的强度略有降低,断裂伸长率增加;而共混纤维的比电阻和热分解温度降低。仅含质量分数10％共聚物的共混纤维经氯漂后,对大肠杆菌的杀灭率可达97.5％。     

丙烯腈系纤维

<正>20141126氢氧化钠水解聚丙烯腈的表征Hu X.…;Advanced Materials Research,2011,p.333(英)聚丙烯腈纤维在其聚合物链中包含至少质量分数为85%的丙烯腈共聚体。聚丙烯腈纤维中的氰基(-CN)在NaOH水溶液中水解后转换为羧基(-COOH)。研究用铬黄法表征氢氧化钠溶液中共聚丙烯腈纤维的水解。其最佳的水解技术是:氢氧化钠的质量分数为12%,时间为10 min,温度为80℃。另外,还用扫描电子显微镜对聚丙烯腈纤维和改性聚丙烯腈纤维     

丙烯腈-醋酸乙烯酯共聚物的沉淀分级

聚丙烯腈纤维和丙烯腈与其他某些单体共聚物纤维(俗称人造羊毛)具有许多优良的性能,是合成纤维中重要的一类。但这类高聚物能否成纤及成纤后的性能与其平均分子量及分子量分布有密切关系。霍鸟茨(R.C.Houtz)认为用来制造纤维的聚丙烯腈的数均分子量应在40,000～80,000之间。一般说,在合适的成纤聚合物中低分子物含量愈多,成纤后的性能也愈     

丙烯腈系纤维

TQ346.23德国Dralon和Kelheim合资生产产业用丙烯腈纤维International Fiber Journal,2005,(6),p.3(4英)Dralon和Kelheim Fibres公司签订了一份以50/50合资方式生产纺前染色及产业用丙烯腈纤维的意向书。Kelheim的所有丙烯腈业务将交给该合资公司。但Dralon目前的业务不属于合资公司。双方声称他们发现了明显的增长潜力并将尽快投资以扩大产能。(金磊)聚丙烯腈纤维生产商合资德国20061102多种类型聚丙烯腈纤维Frangi C.…;Tinctoria,2003,100(10),p.2(8英)文章论述了丙烯腈纤维的发展史,合成、物理性质、热性能、化学性能以及丙烯腈纺…     

去除丙烯腈产品过氧化物工艺技术

丙烯腈是重要的化工产品。随着丙烯腈下游产品加工的多元化,对丙烯腈产品中过氧化物含量也有不同的要求,过氧化物超标的问题时常困扰着丙烯腈生产企业,直接影响到丙烯腈产品的销售和市场竞争力。探讨了去除丙烯腈产品过氧化物的工艺技术,解决了丙烯腈装置过氧化物超标的难题。     

共混法制备酸性可染聚丙烯腈纤维

用含有碱性基团的丙烯酸氨基酯(TAM)与丙烯腈(AN)单体共聚,其共聚物与聚丙烯腈(PAN)共混,经湿法纺丝制备酸性染料可染PAN共混纤维。结果表明,AN／TAM共聚物与PAN有良好的相容性。随着TAM含量的增加,PAN共混纤维结晶度下降,力学性能下降。纤维中TAM质量分数5％较好,PAN共混纤维酸性染料上染率大于80％。     

PAN/AN-co-ADMH共混纤维的氯化漂洗处理

采用聚丙烯腈(PAN)与丙烯腈(AN)/3-烯丙基-5,5-二甲基乙内酰脲(ADMH)共聚物共混湿法纺丝制备了PAN/AN-co-ADMH共混纤维,用质量分数1%的次氯酸钠溶液对共混纤维进行了漂洗处理,探讨了氯漂条件对共混纤维氯含量的影响,考察了氯漂处理后的共混纤维的耐洗涤性及再生性。结果表明:随漂洗液温度升高和氯化漂洗时间增加,共混纤维中氯含量增加;漂洗时间继续增加,纤维氯含量增势变缓;纤维氯含量随洗涤次数或漂洗次数增加均减少。     

Studies on fibers spun from poly(vinyl alcohol‐b‐acrylonitrile) emulsions prepared by ultrasonic technique. I. Characterization of fiber structure

The structural characteristics of poly(vinyl alcohol‐b‐acrylonitrile) fibers with different AN contents were studied by comparison with that of PVA and PAN fibers. X‐ray diffraction analysis showed that both PVA and PAN blocks in the copolymer fibers formed crystals. Two glass transition temperatures corresponding to PVA and PAN components appeared on the dynamic mechanical spectrum of the copolymer fiber, indicative of their incompatibility in the fiber. SEM intuitively exhibited a longitudinal cracked and grooved surface morphology similar to that of PAN fiber and revealed an internal microdomain separation morphology for the block copolymer fibers. TEM showed a morphological structure intermediate between those of PVA and PAN fibers for the block copolymer fibers. It was also found that the copolymer fiber with the lower AN content has a sheath–core structure. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 979–988, 2001     

Studies on fibers spun from poly(vinyl alcohol‐b‐acrylonitrile) emulsions prepared by ultrasonic technique. II. Properties of the fibers

The moisture content of poly(vinyl alcohol‐b‐acrylonitrile) fibers decreases with an increasing hydrophobic AN content and crystallinity of the fibers; however, the copolymer fiber with 26.94% AN, drawn × 5, and heat‐treated at 200°C has a moisture content value slightly lower than that of commercial PVA fiber, but much higher than that of commercial PAN fiber. The block copolymer fibers have a water‐retention value higher than that of commercial PVA fiber, owing to the presence of voids in these fibers, and have a stronger wicking ability than that of commercial PVA, PAN fibers, and wool and cotton mainly due to the grooved surface and bulk porous morphology of the fibers. The tensile strength of the copolymer fibers with an appropriate AN content are lower than that of commercial PVA fiber, but higher than that of commercial PAN fiber and much higher than that of wool and cotton. The melting temperatures of the copolymer fibers increase with increasing heat‐treatment temperature. The copolymer fibers possess a lower peak cyclizing temperature than that of the PAN fiber and have a higher thermal stability than that of both PVA and PAN fibers. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 989–994, 2001     

Effect of comonomer composition on the properties of polyacrylonitrile precursor and resulting carbon fiber

Since the itaconic acid (IA) comonomer is the potential initiator of cyclization, therefore the introduction of IA comonomer into polyacrylonitrile (PAN) precursor can depress the onset of exotherm (or cyclized temperature) and peak temperature. However, the more the IA content, the lower the conversion of acrylonitrile (AN) in the polymerization reaction. Although 2-ethylhexyl acrylate (2-EHA) comonomer in PAN precursor may prevent the cyclization propagation of nitrile groups during oxidation, PAN precursor with a few percent of 2-EHA comonomer has a more preferred orientation. As the content of 2-EHA comonomer further increases, the orientation of the resulting carbon fiber decreases correspondingly. In this study, PAN precursor, with the composition of 98 mol % AN, 1.5 mol % 2-EHA, and 0.5 mol % IA, and its resulting carbon fiber have the best mechanical properties. From the results, it is shown that there is a good relationship between the tenacity and modulus of PAN precursor and those of its resulting carbon fiber.     

聚丙烯腈中空纤维膜的纺制及其应用

PAN中空纤维膜是一种具有高附加价值和广泛用途的功能纤维。本文以PAN—DMSO—添加剂溶液纺制成PAN中空纤维膜,并探讨了纺丝方法和纺丝工艺;用扫描电镜观察了PAN中空纤维膜的形态结构,并解释了成膜机理;从三个方面探索了PAN中空纤维膜的应用,取得了满意的结果。     

聚丙烯腈/水滑石插层共混体系的结构和性能研究

采用原位聚合法,以过氧化二苯甲酰为引发剂,在形成水滑石的同时单体丙烯腈进入其层间并发生聚合反应,制备出聚丙烯腈/水滑石插层复合材料.用红外光谱、扫描电镜和X射线衍射对这种插层复合材料的结构进行了分析和表征,并对其燃烧性能和热性能进行了初步研究.结果表明:在水滑石片层之间通过原位聚合的方法生成了聚丙烯腈大分子,使水滑石层间距有一定程度的增大.聚丙烯腈/水滑石共混复合物的阻燃性能有一定提高,其极限氧指数(LOI)从18%提高到了21%;耐热性能得到一定程度改善.     

PAN原丝沸水收缩率影响因素的探讨

采用溶液聚合和湿法纺丝制备碳纤维用聚丙烯腈(PAN)原丝,探讨了共聚组成、凝固浴温度、凝固浴浓度、拉伸介质和热定型温度对PAN纤维沸水收缩率的影响。结果表明,采用二元共聚物丙烯腈/甲叉丁二酸的质量比为99/1,凝固浴温度为30℃、凝固剂中二甲基亚砜质量分数为70%,热定型温度为160℃,拉伸介质为加压饱和蒸汽时,制备的PAN原丝沸水收缩率最低。     

不同共聚单体与丙烯腈的共聚合及其表征

采用四种共聚单体衣康酸(IA)、丙烯酸甲酯(MA)、丙烯酰胺(AM)、甲基丙烯酸甲酯(MMA)分别与丙烯腈(AN)进行自由基溶液共聚合,讨论了不同共聚单体对聚合反应动力学及所得纺丝原液的粘度的影响,对聚合物的热性能进行了DSC分析,考察了不同共聚单体对聚丙烯腈原丝热性能的影响。结果表明:AN/IA体系随IA含量的增加其反应速率明显下降;与其它单体相比AM更可能有效地降低聚丙烯腈原丝的预氧化温度,缓和放热,而衣康酸次之。同时,IA含量过大,会导致原丝预氧化时的降解。     

PAN分子取向程度与纤维结构性能的关系

研究了丙烯腈(AN),甲叉丁二酸(ITA)聚合体系中PAN分子取向与纤维结构、性能之间的关系。 结果表明:在一定范围内,PAN分子取向因子的增加有利于提高纤维的结晶度和(100)晶面法线方向上晶粒 尺寸,提高纤维的体积密度和力学性能。但同时增加了纤维内应力,使纤维的沸水收缩率增加。综合考虑取 向因子对纤维结构性能因素的影响,认为PAN原丝晶区取向因子约为0.9、总取向因子约为0.8时,纤维力 学性能较好。