共查询到18条相似文献,搜索用时 463 毫秒
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尼龙1010球晶的熔融 总被引:2,自引:0,他引:2
本文利用偏光显微镜研究了尼龙1010等温结晶所生成的几类球晶的熔融现象,测得正环状球晶的熔点(T_m)为182℃,正放射球晶T_m=203℃;混合放射球晶T_m=202~205℃;暗负放射球晶T_m=204~210℃;亮负放射球晶T_m=205~210℃。利用Hoffman T_m-T_ε外推法测得其平衡熔点T_m~0=215℃。 相似文献
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表面富含羧基的单分散交联聚合物微球的快速自组装制备胶体晶的研究 总被引:2,自引:0,他引:2
在20~70℃范围内,用垂直沉积的方法可使表面富含羧基的单分散交联聚合物微球在不同的基底上快速自组装成三维有序的胶体晶.不同粒径的微球形成的胶体晶其光禁带峰位不同,因此可调控不同波长的光在胶体晶中的传播.利用紫外-可见光谱研究了胶体晶的光禁带峰位与组成其微球粒径之间的关系.结果表明,随着构成胶体晶微球粒径的增大,胶体晶光禁带峰位发生了红移,而随着入射光角度的增大,胶体晶的光禁带峰位发生了蓝移.利用原子力显微镜和扫描电子显微镜研究了其它条件对聚合物微球有序排列的影响,发现聚合物微球在pH值为3.0~13.0范围内可以形成三维有序自组装胶体晶.这是由于在不同的pH值下,聚合物微球表面发生羧基化及去羧基化反应,导致在自组装过程中微球之间和微球与介质之间作用力的变化 相似文献
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利用2台中红外量子级联激光器(QCL)组成的泵浦探测(pump-probe)光路通过红外共振吸收对高分子球晶进行选择性熔融进而实现球晶雕刻.当QCL激光频率和分子基团振动频率相同时,会发生共振吸收,产生强烈的热效应,诱导样品快速熔融;QCL激光具有高偏振性,优先诱导振动方向和红外激光偏振方向一致的基团发生共振吸收,因此可以实现选择性熔融;高分子球晶中有沿着各个方向的分子链并且取向方向确定,可以通过pump球晶不同部位来验证球晶雕刻的可行性.一台激光器(pump)对应分子链中基团的强吸收峰,共振加热诱导晶体熔融;另一台激光器(probe)对应分子特征基团(构象)的吸收峰,追踪结构变化;pump光可以选择性定点熔融,pump和probe 2束光均能在线追踪样品熔融程度,是该检测方法的突出优点.选用聚丁烯-1(iPB-1)为研究对象,实验结果显示,球晶熔融程度随基团振动方向与pump光偏振方向夹角的增大而减弱,证明了利用QCL在球晶尺度上进行雕刻是可行的,为原位在线研究快速熔融过程提供了新的研究途径,为定点调控晶型转变及晶体聚集态结构形态提供了思路. 相似文献
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Yue-Shen Chen John A. Cuculo 《Journal of polymer science. Part A, Polymer chemistry》1986,24(9):2075-2084
Solutions of cellulose in a mixture of 27:73 (w/w) of liquid ammonia and ammonium thiocyanate become liquid crystalline at room temperature above a certain critical concentration which depends on the degree of polymerization of the dissolved cellulose. The high optical rotations of the solution suggest that the cellulose mesophase is cholesteric in nature. In the two-phase region, the cellulose solutions exhibit negatively birefringent spherulites that possess both ringed and nonringed internal structures. The anisotropic solutions can be oriented by shear, indicating high potential for spinning them into useful fibers. 相似文献
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尼龙1010结晶与熔融行为的研究 总被引:3,自引:1,他引:3
用DSC研究了降温速率R对尼龙10 10结晶与熔融的影响,以及室温(RT)和液氮(LN)骤冷退火样品的熔融.降温时结晶温度随R增大线性降低;T_g以上可完成结晶时结晶度相同;结晶起始温度>181℃生成的晶体有三个熔融峰,对应于环状和放射状球晶的转化与熔融;在181℃和T_g间结晶,无放射球晶转化峰;T_g下有结晶放热峰样品加热时有冷结晶发生.RT未退火样品三个熔融峰,退火温度T_α≥180℃样品两个峰,结晶度C∝T_a;LN未退火样品单一熔融峰,T_a>160℃双峰,T_a≤160℃三峰,低温峰温与C均∝T. 相似文献
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Meritxell Martínez‐Palau Lourdes Franco Jordi Puiggalí Goran Ungar 《Journal of Polymer Science.Polymer Physics》2007,45(18):2640-2653
Isothermal crystallization behavior of a new regular polyester constituted by glycolic acid and 4‐hydroxybutyric acid units is studied by means of differential scanning calorimetry and hot‐stage optical microscopy. A wide range of crystallization conditions were experimentally accessible, allowing various morphological features to be observed and accurate estimates made of characteristic growth parameters, including radial growth and nucleation rates. Three‐dimensional spherulitic growth from heterogeneous nuclei is deduced from the Avrami analysis, whereas optical micrographs reveal two different spherulitic textures that agree with the existence of two crystallization regimes. These can be well distinguished from the breaks observed in the Lauritzen and Hoffman plots when the linear crystal growth rate or the overall crystallization rate is considered. Ringed and nonringed spherulites with negative and positive birefringence, respectively, can be obtained depending on crystallization conditions and regimes. The studied polyester shows rather complex melting behavior which is interpreted in terms of a recrystallization process involving the two different kinds of spherulites. This study allows polymorphism to be discounted. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 2640–2653, 2007 相似文献
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The lamellar types as revealed by the multiple melting peaks and possible mechanisms of ringed spherulites in poly(trimethylene terephthalate) (PTT) were analyzed with differential scanning calorimetry (DSC), optical microscopy, and scanning electron microscopy. Several interesting correlations were found. If PTT is melt‐crystallized in a certain temperature range, it shows multiple melting peaks and rings in PTT. Once rings are formed in the original melt‐crystallized PTT, they do not disappear but persist and become even more apparent upon postcrystallization annealing at higher temperatures. Furthermore, for PTT that is capable of exhibiting ringed spherulites, a temperature range exists where rings do not form. This behavior can be interpreted in relation with the demonstrated thermal behavior in PTT. Reorganization took place upon postcrystallization scanning or annealing to or at higher temperatures. A postulation was proposed and rigorously tested with evidence to correlate the ringed spherulites and melting behavior. Rings in PTT may be related to multiple lamellae in the spherulites. Consequently, if a temperature of crystallization is selected so that there is only one type of lamella in the spherulites, then there should be no rings. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 80–93, 2002 相似文献
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尼龙1010异常光性球晶的旋转观察 总被引:1,自引:0,他引:1
通过在偏光显微镜下对尼龙1010三类异常光性球晶的旋转观察,发现其消光图案和加一级红补色器时的颜色分布,均随观察角度不同而呈周期性变化,表明其结构单元并并非是沿任一半径均等效排列,而可能是半径不等效的. 相似文献
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Jian-bin Song Qing-yong Chen Min-qiao Ren Xiao-hong Sun Hui-liang Zhang Hong-fang Zhang Shu-yun Wang Zhi-shen Mo 《高分子科学》2006,(2):187-193
The wide-angle X-ray diffraction (WAXD) patterns of isothermally crystallized Nylon 1212 show that γ-form crystals form below 90℃ and the α-form crystals can exist above 140℃. In the temperature range of 90-140℃, the α-form and γ-form crystals coexist. Variable-temperature WAXD exhibits that the nylon 1212 γ-form does not show crystal transition on heating, while α-form isothermally crystallized at 160℃ exhibits Brill transition at a little higher than 180℃ on heating. The multiple melting behaviors of Nylon 1212 isothermally crystallized from melt come from a complex mechanism of different crystal structures, dual lamellar population and melting-recrystallization. In polarized optical microscope (POM) observations, Nylon 1212 isothermally crystallized at 175℃ shows the ringed banded spherulites. However, at temperatures below 160℃ the ringed banded image disappears, and cross-extinct spherulites are formed. 相似文献
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The effects of molecular weight, molecular weight distribution, crystallization temperature, quenching medium, and sample preparation on the formation of ringed spherulites in linear polyethylenes were studied by polarized light microscopy and small-angle light scattering. When the samples were crystallized at a predetermined temperature, ringed spherulites were formed over a narrow range of temperature and molecular weight with both fractionated and unfractionated polymer samples. Quenching the samples in air at room temperature considerably extended the range of molecular weights for the formation of ringed spherulites. Minor modification of an airquench method further extended the range and yielded better-defined structures. The results are interpreted in terms of the anisotropy of the melt, the thermal conductivity of the quenching medium, and the shear stress applied during the crystallization process. That highly specific conditions are necessary for spherulite formation, of both the conventional and ringed type, is a major conclusion of this study. 相似文献