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聚脲的化學性質和應用領域

日期：2023-8-2 发布者：聚脲

　　自然界中，聚脲是一種重要的有機化合物，由異氰酸酯與多元醇反應聚合而成。它的基本化學結構是氨基脲基和酯鍵的重複組合。這種特殊的結構賦予聚脲許多優異的性質，使其在衆多領域中得到廣泛應用。

　　聚脲在合成材料領域具有重要地位。由于其高強度、高韌性和優異的耐熱性能，聚脲常被用于制造彈性體、彈性體海綿和密封材料等。此外，由于聚脲材料能夠調整其硬度和柔軟度，因此還可以用于制造軟質塑料、泡沫材料和車身塗層，爲汽車和建築行業提供保護。

　　總之，聚脲的化學性質和應用領域是多樣的。其基本化學結構賦予了聚脲獨特的性質，使其成爲合成材料、塗料和膠粘劑等領域的重要組成部分。隨著科學技術的不斷進步，相信聚脲的應用範圍將會進一步擴大，並爲各個領域帶來更多創新和發展。

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[Pg 51] They saw a native ferry-boat at one point, which was heavily laden with a mixed cargo. According to Fred's inventory, the craft contained a horse and half a dozen men, together with a lot of boxes and bundles, which were, as the auctioneers say, too numerous to mention. The head of the horse was firmly held by the groom who had him in charge, as it[Pg 285] would have been a serious matter if the beast had broken away and jumped into the stream with all his load about him. A Japanese ferry-boat does not appear the safest thing in the world, but, somehow, one never hears of accidents with it. If any occur, they must be carefully kept out of the papers. never listened to a more illuminating exposition of the subject. J. A. Convinced that both the hydroplane and the yacht would have located the spot on the sea where they would meet, Jeff broke the tedium of his tight circle by a reverse of controls, banking to the other side and swinging in a climbing spiral to the right. Evidently Jeff either caught his thought or decided on a course through his own quick wit. "Stop it; stop it!" yelled Si, his temper again rising. "Great day, can't you fellers understand plain English when it's talked to you? What's the matter with you, anyway? Here, Bradshaw, when I give the order to count, you count one. Wheel wright, you count one at the same time. Williams and Talbot, you each count two. Then Aldrich, you and Reynolds count one, and so on." The Deacon rubbed his eyes and hastened a moment to the clamor outside. It seemed as if there were a thousand curs surrounding them, barking, howling, snarling, fighting, and scratching. He snatched up a club and sprang out, while Shorty tottered after. He ran into the midst of the pack, and began laying about with his strong arms. He broke the backs of some, brained others, and sent the others yelping with pain and fright, except two particularly vicious ones, who were so frenzied with hunger that they attacked him, and bit him pretty severely before he succeeded in killing them. Then he went around to the end of the crib nearest his precious hoard, and found that the hungry brutes had torn away his clay and even the larger of the stones, and nothing but their fighting among themselves had prevented the loss of his chickens. "What in tarnation set the beasts onto us," inquired Shorty wonderingly. "They were wuss'n cats around catnip, rats after aniseed, or cattle about a spot o' blood. I've felt that me and Si wuz in shape to bring the crows and buzzards around, but didn't expect to start the dogs up this way." Si saluted and took his position, facing the line, with a look of calm impartiality upon his face. Shorty turned around and backed up to him so that the calves of their legs touched, and began intently studying his gunlock. "I don't say he told the Baron," said Calverley; "but I believe Holgrave loves to make every body look worse than himself; and to be plain with you, John Byles, I love him not." "Fly, knaves!" cried the galleyman, addressing Byles and Calverley, as he released the latter. "And now, meddling steward, if you attempt to interfere with her who is in that holy berth yonder, or injure the honest yeoman, her son, for this night's doings, the Lord have mercy upon you! Here, Stephen," (walking towards Holgrave, who had thrown himself beside the grave,) "up, and jump behind on my horse, for the cry of sacrilege will edge their brands, and friend or foe will have little chance. There—the abbey-gate is thrown open, and out they come with brand and torch." HoME 高清无码伦理片集合 ENTER NUMBET 0014www.lbqkl.com.cn
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