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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
A polyamic acid (PAA)/polyurethane (PU) blend with PU as the disperse phase was first prepared via in situ polymerization of pyromellitic dianhydride and 4,4-oxydianiline in PU solutions.
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It was found that the size and content of pores increased with an increase in the PU mass fraction in the PAA/PU blend up to 20%.
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They came from Arctic-Tertiary, Paleo-tropical-Tertiary and Tethys-Tertiary florisitic elements, and the blend of the three elements with many genera of autochthonous origin.
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The surface composition of the blend films was determined by Fourier transform infra-red spectroscopy coupled with a variable incidence angle attenuated total reflection accessory (ATR-FTIR).
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The radius of the dispersed phase in the system decreases greatly when the compatibilizer is added into the blend.
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| | The crystal structure of C4H4N8O14 has been determined by X-ray diffrac -tion method. The crystal recrystalized from blend solvents of dichloroethane and heptane is of colourless pyramids. It is monoclinic, belonging to the space group P21/n, with the following cell dimensions:a = 11.820, b = 6.162, c = 18.229A, β = 96.1°The data collection was carried out on diffractometer with CuKα radiation. The structure was solved by the direct method and refined by the full-matrix least-squares technique, using ... | | C_4H_4N_8O_(14)的晶体属单斜晶系,空间群P2_1/n。晶胞参数为:a=11.820,b=6.162,c=18.229,β=96.1°,Z=4,在PW1100四圆衍射仪上收集到I>2σ(Ⅰ)的衍射点2024个。晶体结构以自编的直接法计算程序解出,最后偏离因子R=0.105。 | | 文摘来源 | | This paper investigated mechanism of electrical treeing inhibition in SBR/ LDPE (styrene butadiene rubber and low-density polyethylene) and HDPE/ LDPE (high-density polyethylene and low-density polyethylene) polymer blend system. The experimental results show that the physical blends (physical method) of the change of polymer morphology increase the treeing inc(?)ption voltage of polymer blend system (improve tr(?)eing resistant property of LDPE) and this is be(?)ause increasing the stress... | | 本文研究了SBR/LDPE(丁苯橡胶/低密度聚乙烯)和HDPE/LDPE(高密度聚乙烯/低密度聚乙烯)聚合物共混体系电树枝抑制机理.试验结果指出,聚合物形态变化的物理共混(物理方法)提高聚合物共混体系电树枝起始电压(改善LDPE耐树枝特性)是基于共混体系耐麦克斯威尔应力特性的提高导致树枝诱导期的增加和延缓或终止电树枝的发展. | | 文摘来源 | | By means of microscopy, scanning electron microscopy, and infraredanalysis, the course of formation of the ternary mixed blend composed ofPP-g-P(MA-co--VAc) and P(MA-co-VAc) during heterogeneous graft copoly-merization of MA/VAc mixtures onto PP, the morphological structure ofthe grafting products and the effect of the P (MA-co-VAc) content on thecrytallization behavior from melt in the presence of PP-g-P (MA-co-VAc)have been studied. The results show that the polymer blends, similar to metallic... | | 用光学显微镜,扫描电镜和红外光谱分析研究了MA/VAc混合单体与pp非均相接枝共聚中PP/PP-g-P(MA-co-VAc)/P(MA-co-VAc)三元混合物的形成过程及其形状结构,观察了在PP-g-P(MA-co-VAc)存在下P(MA-co-VAc)的相对含量对共混物熔融-结晶过程的影响,结果表明,这种聚合物共混体系和金属合金相似,在给定条件下有—特定的组成。 | | 文摘来源 | |   | | << 更多相关文摘 |
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