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胡志颖 《武汉理工大学学报(材料科学英文版)》2014,(6)
The starch-g-lactic acid copolymer was synthesized with catalysis of sulfuric acid by onestep process, and the structure of starch-g-lactic acid copolymer was characterized by means of IR, 13C-NMR, HMBC, XRD, and SEM. The experimental results show that the maximum grafting degree of starch can reach 75% when the starch-g-lactic acid copolymer is activated at 80 ℃ for 2 h and reacted with lactic acid at 90 ℃ for 4 h in vacuum. 相似文献
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为了明确亏损上市公司资产重组的动机,采用财务扭亏效果指标对资产重组给亏损公司带来的影响进行衡量.检验了2002~2004年亏损上市公司在亏损次年的资产重组的扭亏业绩,发现资产重组对亏损公司重组当年以是否扭亏来衡量的业绩有重大影响.区分各种资产重组方式,资产剥离、资产置换和其他方式都对扭亏有显著效果,且资产置换表现最好,但购并表现出不明显的扭亏效果. 相似文献
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