纺速对PEIT卷绕丝超分子结构及力学性能的影响

借助由X射线衍射法，密度法，DSC法测定的结晶度和沸水收缩率，自然拉伸比，声速取向因子等指标来描述纺丝速度在2400－5000m/min范围内变化的PEIT卷绕丝的超分子结构。在实验的纺速范围内，PEIT卷绕丝的结晶度随纺速增加的过程中有突变现象，这主要是因为分子取向诱导所致。最后，就不同纺速下PEIT初生丝的力学性能特征值进行了对比。     

纺丝速度对Lyocell纤维结构的影响

研究了以N 甲基吗啉 N 氧化物(NMMO)为溶剂的Lyocell纤维纺丝工艺中纺丝速度对Lyocell纤维结构的影响.实验结果表明:随着纺丝速度的提高,Lyocell纤维的结晶度、晶区取向、双折射及无定形取向增大,但当纺丝速度达到50m/min时,纤维的双折射和无定形取向都达到最大值,纺丝速度继续提高,纤维的双折射维持恒定不变,无定形取向反而下降.     

Preparation of High Shrinkage Polypropylene

The common PP chips have been used to prepare high shrinkage PP fibers with shrinkage in boiling water higher than 50%. Meanwhile, the process conditions on fiber structure and properties have been discussed in detail. With the increase of drawing temperature, the shrinkage in boiling water of the fiber increases at first, and then decreases in the temperature range from 70℃to lOO℃. The better drawing temperature is from 75℃ to 85℃ according to the melt index of the PP material. The shrinkage in boiling water of PP fiber increases with the increase of pump delivery. The orientation factor and crystallinity increase with the increase of drawing temperature. With an increase in drawing temperature, unit-cell numbers and monomer unit numbers in every crystal nucleus tend to increase, but unit volume crystal nucleus tend to reduce.     

Effects of Coagulation Conditions on Tensile Properties of Regenerated Cellulose Fibers

The effects of coagulation conditions on tensile properties of the regenerated cellulose fibers prepared by wet-spinning from NaOH/thiourea/urea(8∶6.5∶8 by weight)aqueous solvent were investigated by tensile tester,X-ray diffraction(XRD),and scanning electron microscope(SEM).The results show that the tensile properties of the as-spun fibers change with the coagualtion concentration,temperature,and time.When the spinning solution is coagulated in 10% H2SO4/12.5% Na2SO4 aqueous solution,the as-spun fibers hav...     

纺丝溶液的挤出对聚丙烯腈初生纤维表面形态的影响

采用旋转流变仪并结合Tanner黏弹性流体挤出胀大方程研究了剪切对聚丙烯腈/二甲基亚砜(PAN/DMSO)溶液挤出胀大的影响,用原子力显微镜(AFM)研究了挤出速度对PAN初生纤维表面粗糙度的影响规律。结果表明：随着挤出速度的增大,体系的挤出胀大比逐渐增大,当挤出速度大于90m/h时,挤出胀大比的变化出现拐点,增大的趋势变缓;聚合物大分子链的回复是初生纤维表面形貌形成的主要原因,湿法纺丝过程中,挤出速度低于90m/h时初生纤维表面粗糙度随着挤出速度增加而减少,在较高挤出速度时,随着挤出速度增加而增加;干湿法纺丝初生纤维的表面粗糙度明显低于湿法纺丝,并且随挤出速度的增加而增大。     

Blended Yarns of Modacrylic Fibers with Silk Protein

The fiber properties of modacrylic fibers with silk protein and spinning technology for blended knitting yarns are studied. By testing the fiber properties, fiber spinn-ability is analysed. Modacrylic fibers with silk protein are brittle and have poor cohesion, so the key to process modacrylic fibers with silk protein lies in forming lap and sliver. During opening and carding, low speed is used to decrease fiber damage and the proper static resistant oil is applied to eliminate lapping fibers. Besides, the temperature and relative humidity have to be strictly controlled. The applications of modacrylic fibers with silk protein are also put forward.     

中空形态聚丙烯腈基活性炭纤维预氧化过程的研究

聚丙烯腈（PAN）中空纤雏在空气中、不同温度下预氧化2h，接着在N2气氛中炭化，CO2气氛中活化，得到PAN基活性中空炭纤维（PAN—ACHF）。测定了PAN—ACHF对碘和亚甲基兰的吸附量。考察了预氧化温度对预氧化纤维的收缩率和芳构化指数的影响，以及对PAN—ACHF的收缩率、活化收率和吸附性能的影响。     

Influences of NMMO Content in Coagulation Bath on Mechanical Proper-ties of Lyocell Fibers

The influences of the coagulation bath concentration in N-Methyl-Morpholine-N-oxide(NMMO)processon the maximum spinning speed and the mechanicalproperties(the modulus,the tenacity and the extensionat break)of Lyocell flbers are investigated.The resultsshow that the maximum spinning speeds decrease withthe increasing coagulation bath concentration.When theconcentration of coagulation bath is 10％(wt％),the te-nacity and modulus of the obtained Lyocell fibers reachmaximum and the extension at break of the fibers reach-es minimum.     

Study on Shrinkage of PEIT Fiber and Latent - crimp of PEIT/PET Conjugate Fiber

The shrinkage behavior of copoiyester fibers (PEIT) and the ' latent - crimp behavior of side - by - side PET/ PEIT composite fibers have been studied. It is shown that the shrinkage rate, the crimp ratio and the crimp rigidity of these fibers increase with the increasing isoph-thalate content of PEIT and the treatment temperature. The shrinkage in boiling water of the cold - drawn PEIT - A2 fiber appears to be higher than that of PEIT - A3. The shrinkage in dry air of the cold - drawn PEIT - A2 fiber is also higher than that of PEIT at temperature of 393 K or 413K, but lower at 453K. The crimp rigidity of the PET/PEIT - A: conjugate fiber appears to be obviously higher than that of the PET/PEIT - A, conjugate fiber. The mechanism of the shrinkage behavior related these fibers are discussed in detail.     

Study on the Process Technology of PA6/PET Bicomponent Fiber

PA6/PET bicomponent fiber at different spinning speeds were produced. Influences of cross blowing, spinning speed, PA6 and PET component ratio, drawing condition etc. on the mechanical properties, heat shrinkage, orientation and crystallization of the fiber were investigated. Also the rules among these influencing parameters were obtained. The splitting property of the fiber and its influence on the textile processing are discussed, which offers a base for the production of PA6/ PET bicomponent fiber using splitting technology.     

EFFECTS OF PROCESS CONDITIONS ON THE STRUCTURE AND PROPERTIES OF GEL-SPUN PVA FIBERS

Some noticeable effects of process conditions, such as coagulation bath, solvent extraction, drying shrinkage and ultra-drawing, on the structure and properties of gel-spun PVA fibers are studied and discussed. High strength and high modulus PVA fibers with tensile strength of 11.3 cN / dtex and initial modulus of 430 cN / dtex have been obtained.     

Influence of Dispersion of Nano-ZnO Particles in Polymer Matrices on Properties of Relevant Nano Composite Fibers

IntroductionIt is well knownthat nanoparticles have rich propertiesand are useful for functional composites . The nanometricsize ,leading to huge specific surface area up to or morethan1 000m2/g ,andtheir unique properties have attractedintensive interests . Thus many articles have elucidated thepreparation of polymer matrix nanocomposites( PMNC)[1 6]. Polymers are very i mportant matricesbecause of their flexibility and easy processing .Nanoparticles i mpart larger-size congeries because of…     

化学降解对聚丙烯纺丝及织构性能的影响

采用密度法，声速法，Ｘ射线衍射，强力试验仪研究了化学降解改进剂含量不同的等规聚丙烯共混纤维的结构作性能，讨论了化学降解改进剂对聚丙烯纤维织构的影响。分析了缚结分子对纤维收缩力的作用及纺速对纤维织构的影响。     

PAN/HBP复合超细纤维的制备与表征

采用聚丙烯腈/N,N-二甲基甲酰胺/多氨基超支化聚合物三元体系为纺丝液,通过静电纺丝制备了PAN/HBP复合超细纤维,探讨了聚丙烯腈浓度、超支化聚合物含量、纺丝电压、接收距离和推进速度等因素对复合纤维直径和形貌的影响.结果表明,增大PAN浓度和增加HBP含量,都会使纤维直径增大;静电纺丝电压增大,可以减小纤维直径;适当的接收距离和推进速度才可以获得直径细而均匀的纤维.通过对PAN/HBP复合超细纤维的氨基含量测试和FTIR分析,进一步证实了PAN/HBP复合纤维表面和内部氨基的存在.     

高收缩涤纶长丝性能研究

本文以高速纺卷烧丝POY为原料，经过调节不同的牵伸速度和温度等参数制备了具有10－60％收缩性能的涤纶长丝，测试了高收缩涤纶长丝收缩前后的结晶度和取向度的变化，讨论了收缩温度和时间对纤维收缩的影响，以及高收缩纤维的收缩率和纤维强伸度的关系。     

PPTA纤维高速纺丝新工艺

本文报道了PPTA纤维(芳纶1414)高速纺丝新工艺。着重从纺丝速度、纺丝拉伸比、空气层高度、凝固条件及新型纺丝装置对纤维结构性能的影响等进行了深入的研究。研究表明:以纺速为400m/min,空气层高度为12mm,剧烈的凝固条件及较高的拉伸倍数等条件下进行纺丝,这些条件有利于提高纤维的力学性能。若提高纺速并施加张力销将可进一步增加纤维的拉伸模量。实践表明:较短的纺丝管和适当的稳流层高度对纤维的成形及增加纺速是重要的。     

纺纱工艺与毛纱落水松弛缩率的关系

本文主要研究细纱及后纺工程的工艺参数与精纺毛纱落水松弛缩率和缩率不匀率的关系。发现在细纱成纱前的工艺参数,特别是中皮辊滑溜槽深,严重影响着纱线松弛缩率,而细纱的加捻和细纱成纱后的工艺却影响不大。细纱缩率与股线缩率成倍数关系。     

快淬纳米复合α-Fe/Pr2Fe14B薄带的硬磁性研究

通过熔体快淬法得到α Fe/Pr₂ Fe_{1 4} B纳米双相磁体, 研究了不同辊速快淬带的磁性能, 找到最佳直接快淬辊速条件, 并比较了直接快淬得到的样品和非晶薄带晶化后得到的样品的磁性能, 发现直接快淬得到的样品的矫顽力和机械性能优于非晶晶化样品。     

Thermal Properties of Crosslinking Modified Ultrahigh Molecular Weight Polyethylene Fibers by Ultra-Violet Irradiation

By means of ultra-violet(UV)irradiation with photoini-tiator and multifunctional crosslinking agent,thecrosslinking modification of ultrahigh molecular weightpolyethylene(UHMWPE)fibers prepared by gel-spin-ning was carried out.Thermal properties of fiber sampleswere examined using differential scanning calorimetry(DSC),thermomechanical analysis(TMA)apparatusand a manual device.The results indicated that the opti-mal irradiation energy is 250-400 mJ/cm~2,heat-andcreep-resistant behaviors of modified fibers have beenimproved.     

Die-Swell Performance of Colored Poly(m-phenylene isophthalamide)(PMIA)Fiber Prepared by Wet Spinning

The colored poly(m-phenylene isophthalamide)(PMIA)spinning solution was prepared by wet spinning and the die-swell of the colored PMIA spinning solution was done when it was extruded from a die in this experiment.The properties and structures of colored PMIA fibers were characterized by scanning electron microscopy(SEM).The colored PMIA spinning dopes were first commixed in a pressurizer and then spun into a coagulation bath.The effect of die swell on the colored PMIA solution was resulted from the viscoelastic properties of the colored PMIA solution in the spinning process.The results showed that the die-swell ratio of the colored PMIA solution increased linearly with increasing the pressure and die length/diameter ratio(L/D).At the same pressure and L/D,the die-swell ratio decreased with the increase of filter layers and temperature.Also,optimized spinning parameters of the dopedyed PMIA fiber were obtained.