PA1010结晶的异相成核作用研究

通过引入成核剂（Ｎｄ２Ｏ３）研究ＰＡ１０１０微晶结构的变化，以及对ＰＡ１０１０结晶行为的影响，也讨论了成核剂对结晶－非晶中间相的作用。利用ＷＡＸＤ，ＳＡＸＳ和ＤＳＣ手段，讨论了成核剂的异相成核作用。结果表明，成核剂明显改变了ＰＡ１０１０的微晶结构。

组成对PA1010/6共聚物熔融行为的影响

用ＤＳＣ研究了ＰＡ１０１０／６共聚物初生态及次生态样品的熔融行为，发现初生态样品的高温熔融峰（Ｔ１）和低温熔融峰（Ｔ２）对组成有不同的依赖关系；首次发现ＰＡ１０１０／６共聚物次生态的冷结晶现象，并讨论了冷结晶温度（ＴＣ）、冷结晶时间（ｔｃ）与组成的关系.

Investigation of irradiated PA1010 containing heterogeneous nuclei

This paper deals with radiation effects on PA1010 containing heterogeneous nuclei (Nd2O3). With the help of DSC, WAXD and ESR techniques, the change in the crystallinity and the perfection of the crystal of irradiated PA1010 containing heterogeneous nuclei were studied. Copyright (C) 1996 Elsevier Science Ltd.

γ辐照PA1010－Nd2O3体系的研究

本文利用ＷＡＸＤ、ＤＳＣ、ＥＳＲ方法研究了ＰＡ１０１０－Ｎｄ２Ｏ３体系的辐射效应，主要讨论了结晶－非晶的界面（结晶表面）对辐射效应的影响。结论如下：结晶表面影响ＰＡ１０１０的辐射交联，结晶的破坏剂量因结晶表面积增大而提高。具有相同浓度的成核剂，但结晶度不同的试样，它们的结晶表面积取决于结晶度，它们的辐射效应由于微晶尺寸与结晶表面积的差异而不同。结晶度越大，微晶尺寸越大，结晶越完善，结晶的表面积越大，结晶结构不易受到γ辐照的破坏。结晶表面对结晶结构起着保护作用，进一步证明了结晶表面是结晶破坏的始点

顺磁共振波谱研究辐照异相成核结晶PA1010俘陷自由基的转变

本文通过异相成核剂改变PA1010的结晶表面积,从而使PA1010的微晶结构发生改变。利用顺磁共振方法讨论γ-辐照不同微晶结构的PA1010的俘陷自由基的转变行为。结果表明辐照半结晶PA1010主要产生两种自由基,俘陷于结晶-非晶界面为主的自由基-CH2CONHC·HCH2(a),在放置或加热过程中转化为以非晶区为主要俘陷区域的自由基-CH2-C·=O(b)。成核剂改变结晶表面积从而明显影响着自由基a的含量。相同(近)结晶度条件下,结晶表面积随成核剂浓度增大而增大,俘陷自由基a的含量也高,在一定条件下,自由基a向b的转化量越多。

辐照异相成核结晶PA1010体系的ESR研究——结晶表面积对俘陷自由基的影响

本文通过WAXD,DSC方法讨论成核剂(Nd2O3)对PA1010的聚集态结构的影响。用ESR研究辐照不同聚集态结构PA1010体系的俘陷自由基行为。结果表明:俘陷自由基—CH2CONHCHCH2—主要存在于结晶表面,结晶的表面积越大,俘陷自由基—CH2CONHCHCH2—的含量越高,在一定条件下,如升温,常温放置一段时间,转化为俘陷自由基—CH2C=O的量也越大;俘陷自由基-CH2C=O主要存在于非晶区

APPLICATION OF THE MOMENT METHODS TO ANALYSIS OF X-RAY-DIFFRACTION LINE-PROFILE FOR PA1010-BMI SYSTEM

Pure X-ray diffraction profiles have been analysed for polyamide 1010 and PA1O1O-BMI system by means of multipeak fitting resolution of X-ray diffraction. The methods of variance and fourth moment have been applied to determine the particle size and strain values for the paracrystalline materials. The results indicated that both variance and fourth moment of X-ray diffraction line profile yielded approximately the same values of the particle size and the strain. The particle sizes of (100) reflection have been found to decrease with increasing BMI content, whereas the strain values increased.

聚烯烃弹性体改性尼龙及其共混体系形态、结构与性能

一种新型的聚烯烃弹性体（乙烯-α-烯烃共聚物）EOCP，在引发剂过氧化二异丙苯(DCP)的作用下，与马来酸酐(MA)发生接枝反应，实现了EOCP的官能化，MA的接枝率在0.13～0.92wt%之间。对于弹性体改性尼龙1010 (PA1010)体系，膜抽提实验，间接证实了原位接枝产物PA1010-g- (MA-g-EOCP)的形成。弹性体含量为15wt%时，PA1010/EOCP-g-MA共混物的缺口冲击强度、断裂伸长率、熔体流动速率值在接枝率为0.51wt%处均出现极值；接枝率为0.30～0.51wt%是增韧尼龙的最佳范围；分散相的平均粒径与弹性体的接枝率成反比。少量的接枝弹性体（约12wt%，接枝率为0.51wt%）即能实现PA1010的脆韧转变；形态分析表明，EOCP改性PA1010体系，分散相的平均粒径与其含量成正比，而EOCP-g-MA改性PA1010体系，分散相的平均粒径几乎与其含量无关。WAXD、偏光显微镜及DSC研究表明：EOCP对PA1010的晶型不产生影响；EOCP-g-MA作为异相成核剂，使PA1010球晶向细晶化方向发展，而且随着接枝弹性体含量的增多而加强；DSC分析进一步证实了接枝弹性体促进了PA1010的结晶。EOCP-g-MA是制备PA6/PP合金的一种高效增容剂和改性剂；形态分析显示：EOCP-g-MA改善了尼龙相与聚丙烯相之间的相容性；相对于纯弹性体，接枝弹性体改性的PA6/PP共混体系，形成PA6与PP的共连续相结构，要求组分中有更多的PA6。

The effect of multiwall carbon nanotube on the crystallization, morphology, and rheological properties of nylon1010 nanocomposites

Nanocomposites based on poly(iminosebacoyl imino-decamethylene) (PA1010) and multiwall carbon nanotubes (MWNTs) were successfully prepared by melt blending technique. environmental scanning electron microscope micrographs of the fracture surfaces showed that not only is there an evenly dispersion of MWNTs throughout the PA1010 matrix but also a strongly interfacial adhesion with the matrix. The combined effect of more defects on MWNTs and low temperature buckling fracture is mainly responsible for the broken tubes. Differential scanning calorimeter results showed that the MWNTs acted as a nucleation agent and increased the crystallization rate and decreased crystallite size. In the linear region, rheological measurements showed a distinct change in the frequency dependence of storage modulus, loss modulus, and complex viscosity particularly at low frequencies. We conclude that the rheological percolation threshold might occur when the content of MWNTs is over 2 wt% in the composites.

Crystallization behavior of carbon nanotubes-filled polyamide 1010

The nanocomposites of polyamide1010 (PA1010) filled with carbon nanotubes (CNTs) were prepared by melt mixing techniques. The isothermal melt-crystallization kinetics and nonisothermal crystallization behavior of CNTs/PA1010 nanocomposites were investigated by differential scanning calorimetry. The peak temperature, melting point, half-time of crystallization, enthalpy of crystallization, etc. were measured. Two stages of crystallization are observed, including primary crystallization and secondary crystallization. The isothermal crystallization was also described according to Avrami's approach. It has been shown that the addition of CNTs causes a remarkable increase in the overall crystallization rate of PA1010 and affects the mechanism of nucleation and growth of PA1010 crystals. The analysis of kinetic data according to nucleation theories shows that the increment in crystallization rate of CNTs/PA1010 composites results from the decrease in lateral surface free energy.

Compatibilization of side-chain, thermotropic, liquid-crystalline ionomers to blends of polyamide-1010 and polypropylene

A novel side-chain, liquid-crystalline ionomer (SLCI) with a poly(methyl hydrosiloxane) main chain and side chains containing sulfonic acid groups was used in blends of polyamide-1010 (PA1010) and polypropylene (PP) as a compatibilizer. The morphological structure, thermal behavior, and liquid-crystalline properties of the blends were investigated by Fourier transform infrared, differential scanning calorimetry, thermogravimetric analysis, and scanning electron microscopy. The morphological structure of the interface of the blends containing SLCI was improved with respect to the blend without SLCI. The compatibilization effect of greater than 8 wt % SLCI for the two phases, PA1010 and PP, was better than the effects of other SLCI contents in the blends.

Crystallization and Crosslinking of polyamide-1010 under elevated pressure

The structure and thermal properties of polyamide-1010 (PA1010), treated at 250degreesC for 30 min under pressures of 0.7-2.5 GPa, were studied with wide-angle X-ray diffraction (WAXD), infrared (IR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Crystals were formed when the pressures were less than 1.0 GPa or greater than 1.2 GPa. With increasing pressure, the intensity of the diffraction peak at approximately 24degrees was enhanced, whereas the peak at approximately 20degrees was depressed. The triclinic crystal structure of PA1010 was preserved. The highest melting temperature of the crystals obtained in this work was 208degreesC for PA1010 treated at 1.5 GPa. Crosslinking occurred under pressures of 1.0-1.2 GPa. Only a broad diffraction peak centered at approximately 20degrees was observed on WAXD patterns, and no melting and crystallization peaks were found on DSC curves. IR spectra of crosslinked PA1010 showed a remarkable absorption band at 1370 cm(-1). The N-H stretching vibration band at 3305 cm(-1) was weakened. Crystallized PA1010 had a higher thermal stability than crosslinked PA1010, as indicated on TGA curves by a higher onset temperature of decomposition.

压力对尼龙1010凝聚态结构的影响

研究了尼龙(PA)1010在250℃、不同压力下退火30 min后凝聚态结构的变化。结果表明,在压力小于1.0 GPa和大于1.2 GPa的范围内,PA1010室温结晶的三斜晶系的晶体结构没有变化,但是(100)晶面的衍射强度随压力的增加而减弱,而(110/010)晶面的衍射强度增加;当压力在1.0～1.2 GPa时,PA1010的X射线衍射图谱没有明显的衍射峰,DSC和溶解实验证实,PA1010在该压力范围内发生了交联,并进一步讨论了PA1010在高压下发生交联的机理。

Crystallization and melting behavior of amorphous poly(iminosebacoyl iminodecamethylene)

Multiple melting behavior was observed in the differential scanning calorimetry (DSC) scans for the isothermally crystallized poly(iminosebacoyl iminodecamethylene) (PA1010) samples. Coexistence of crystal populations with different lamellar thickness in PA1010 was discussed by means of DSC, wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering techniques. During crystallization of the polymer, a major lamellar crystal population developed first, which possessed a higher melting temperature. However, a small fraction of the polymer formed minor crystal population with thinner lamellae, which was metastable and, upon post-annealing, could grow into more stable and thicker lamellae through melting and recrystallization process. Lamellae insertion or stacks would develop during the post-annealing at a lower temperature for the isothermally crystallized samples; thus, multiple crystal populations with different thickness could be produced. It is the multiple distribution of lamella thickness that gives rise to multiple melting behavior of crystalline polymers. (C) 2000 John Wiley & Sons, Inc.

Blends of polyamide 1010 with ungrafted and maleic anhydride grafted high impact polystyrene

The crystallization, dynamic mechanical properties, tensile properties and morphology features of polyamidel 1010(PA1010) blends with the high impact polystyrere (HIPS) and maleic anhydride (MA) grafted HIPS(HIPS-g-MA) were examined at a wide composition range. By comparison the PA1010/HIPS-g-MA and PA1010/HIPS binary blends, it was found that the size of the domains of HIPS-g-MA was much smaller than that of HIPS at the same compositions. It was found that the mechanical properties of PA1010/HIPS-g-MA blends were obviously higher than those of PA1010/HIPS blends. When the content of PA1010 is more than 50wt% in the blends, the crystallization temperatures, T-cs, of PA1010 increase with increasing the content of HIPS-g-MA. On the other hand, when the content of PA1010 in the blends is less than 35wt% the fraction crystallization is observed. The same result is not obtained for the blends of PA1010/HIPS. These behaviors could be attributed to the chemical interactions between the two components and good dispersion in PA1010/HIPS-g-MA blends.