Crystallization Behavior of Copolymer Poly(ethylene terephth-alate/isophthalate)(IPET)

The non-isothermal crystallization kinetics, isothermal crystallization and the morphology of crystals of the copolymer poly ( ethylene terephthalate/ isophthalate ) (IPET) were studied by DSC and polarized-light microscopy in this paper. DSC results indicate that the glass transition temperature Tg of IPET is slightly lower than that of poly (ethylene terephthalate) (PET), but the melting temperature Tm and the crystallization temperature Tc of PET and IPET have much difference. The difference of Tc between PET and IPET2 is about 7℃, and the difference of Tm between PET and IPET2 is about 16℃. From the kinetics analysis of the crystallization, the crystallization mechanism of all samples is of three-dimension spherulitic growth from instantaneous nuclei and the incorporation of isophthalate (IPA) decreases the crystallization rate of IPET greatly. The isothermal results indicate that the morphologies of PET and IPET crystals are all spherulite, which is in conformity to the results of non-isothermal d     

残留溶剂对连续莫来石纤维干法纺丝的影响

以干法纺丝制备连续莫来石纤维,研究残留溶剂质量分数在纺程上的变化以及甬道温度、纤维直径对其影响.实验结果显示:沿平行纺丝线方向,残留溶剂质量分数的变化分为3个阶段,变化最快的阶段在距离喷丝板1m长度范围内,残留溶剂质量分数变化量占全程变化总量的60%～63%;沿垂直纺丝线方向,溶剂蒸发分为2个阶段,通过计算机模拟得到了残留溶剂在纤维横截面上的分布曲线.相同实验条件下,纺丝甬道温度升高30℃,残留溶剂质量分数降低2%～3%;纤维直径增大30μm,残留溶剂质量分数减少1%～2%.在实验范围内,最佳纺丝甬道温度为80℃,最佳纤维直径为80～90μm.     

聚丙烯接枝N,N-二烯丙基三聚氰胺的制备及表征

采用过氧化二异丙苯(DCP)作为引发剂,利用反应挤出方法成功制备了聚丙烯接枝N,N-二烯丙基三聚氰胺(PP-g-NDAM).氮元素分析及傅里叶变换红外光谱(FTIR)结果表明:N,N-二烯丙基三聚氰胺(NDAM)已成功接枝到聚丙烯(PP)分子链上.通过测定PP-g-NDAM的接枝率(GD)以及熔体流动指数(MFI),分析讨论DCP及NDAM用量对反应挤出体系的影响.在试验范围内,发现当m(PP)∶m(NDAM)∶m(DCP)=100∶6∶0.4时,PP-g-NDAM的接枝率相对较高,接枝效率最大.采用广角X射线衍射(WXRD)、差式扫描量热法(DSC)及热失重(TG)分析研究了PP及PP-g-NDAM的结晶及热性能,结果表明:相比PP,PP-g-NDAM的晶型及熔融温度未发生明显变化,而结晶温度和热稳定性有明显改善.     

Solution Properties of Soy Protein in DMSO/Urea Solvent System

Solution properties of 7S globulins （7S）, 11S globulins （11S） and soy protein isolates （SPI） in dimethylsulfoxide （DMSO）/urea solvent system were studied by intrinsic viscosity and particle size distributions. The results showed that the existence of urea was the main reason for the denaturation and solubility of soy protein in the system, and the effects were more obvious with increasing of urea concentration in solutions. Suitably dissolution temperature and time contributed to the solubility of soy proteins.     

Compatibility of Soybean Protein and Poly (vinyl alcohol)

IntroductionTheuseofsoybean ,peanut,zeinandothervegetableproteinsasinexpensivefibermaterialstoreplacewoolandsilkcanbetracedbackto 1930s.Earlyin 1935 ,theItalianfirm ,SniaViscosa ,beganlarge scaleproductionofcaseinfibers[1] .Shortlyafterward ,ICIinEngland produced peanut proteinfibersknownasArdil.CoCornProductRefiningmanufacturedzeinproteinfiberin 1939.Theseusesofseedmealsintoindustryenhancethevalueoftheagriculturematerial.Thelargeintroductionofpetroleum basedfibersduring 194 0sand 195 0s…     

无皂种子乳液法制备复合微球

介绍了无皂种子乳液制备复合微球的方法，重点阐述了加料方式，单体亲水性、引发剂，交联剂及交联度，壳单体与种子乳胶间相容性等因素对复合微球形态的影响。     

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。     

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.     

正交试验法优化天然彩色棉色素碱溶液萃取条件

为优化天然绿色棉和棕色棉色素的碱溶液萃取条件,选择L_(25)正交表研究萃取温度、萃取时间、NaOH质量分数对萃取效率的影响,对正交结果进行直观分析和方差分析,并通过X射线衍射谱(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)研究经NaOH萃取色素后的纤维结构。结果表明:天然棕色棉的直观分析结果与方差分析结果一致,即本试验中萃取效率在萃取温度、时间、碱溶液质量分数分别为50℃、20min和7%时最高;碱溶液萃取天然绿色棉时,各水平因素之间存在交叉影响;碱溶液萃取后彩色棉纤维表面粗糙、结晶度下降,但其化学结构无明显变化。     

不同有机胺构筑的Keggin型超分子化合物的合成与晶体结构

利用水热合成方法合成了二个新的Keggin基有机一无机杂化化合物（H3／4Me2bpy）4[PW12O40]．3H2O（1）和（H6／5bbi）：5[PMo12oO40]·H2O（2）（Me2boy=5，5’-甲基-2，2’-联吡啶，bbi=1，1’-（1，4-丁烷）双（咪唑）），并通过元素分析、红外光谱和x-射线单晶衍射方法确定了化舍物的晶体结构．结构分析表明化合物1属于单斜晶系，P21／n空间群，晶胞参数口=13．229（3），b=23．449（5），c=13．720（3），β=118．61（3），V=3736．6（13），Z=2，Rl=0．05910，wR2=0．1397．化合物2属于三斜晶系，P1空间群，晶胞参数a=12．021（2），b=12．131（2），c=20．441（4），a=93．60（3），β=94．71（3），Y=103．21（3），V=2881．8（10），Z=2，R1=0．0692，龆2：0．1828．将目标化合物制成碳糊电极，利用循环伏安法研究了其电化学行为．