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以酵母菌为脱氧剂,以透气性和透水气性好的聚乙烯醋酸乙烯酯(EVA)为基质,来制备一种新型的绿色脱氧包装膜。本文研究了EVA型号、脱氧剂含量、环境温度和湿度对这种脱氧膜的脱氧性能的影响。结果表明,这种新型的酵母菌脱氧膜有较好的脱氧性能,具有一定的市场应用前景。 相似文献
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高锰酸钾引发丙烯腈与木薯淀粉的接枝共聚及共聚物的水解 总被引:8,自引:0,他引:8
研究了木薯淀粉经碱糊化后,以KMnO_4为引发剂,在酸性介质中与丙烯腈的接技共聚。结果表明,单体转化率高,接技效率达95%,支链分子量达30万。接技共聚物在碱溶液中的水解产物吸水能力可超过自重的2000倍。 相似文献
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The main results of the present paper are:1. It is rational to define the limit by the infinitesimal method.2. We have proved that the definitions of the limit by the infinitesimal argument and by the ε-δ arguement are quite equivalent.3. It is possible to determine the values of infinite divergent integrals.Example 1.Example 2. From the following equalities we can calculate the classical electron radius η=2.818×10~(-13) cm.(c, light velocity) 相似文献
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A γ-hydroxyphosphonate P6 (O1-methyl-O2-(1, 2, 2-trimethylpropyl)-2-hydroxy-5-nitro-phenyl methylphosphonic acid) which is proposed to be an analog of the transition state in hydrolysis of soman was synthesized. Artificial antigens were obtained by conjugating P6 to the carrier proteins BSA (bovine serum albumin) and LPH (Limulus polyphenus hemocyanin). Mice were immunized with P6-LPH and recombinant single-chain antibody phage display library was constructed. After 4 rounds of panning against P6-BSA and competitive inhibition enzyme immunoassay, more than 70 strains of phage antibodies capable of binding soman were obtained and 11 of them can accelerate the hydrolysis reaction of soman. One of them (EP6) was studied further. Soluble single-chain antibody was prepared and purification was performed by gel filtration and ion exchange chromatography. The kinetic experiment was carried out showing that the turnover number kcatt= 198 min-1 and the rate enhancement kcatkuncat = 122 419. When 0.16 mg · mL-1 相似文献
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N-(N',N'-二甲氨基甲基)丙烯酰胺-过硫酸钾引发丙烯酰胺聚合的研究 总被引:2,自引:1,他引:2
The kinetic of polymerization of aeqlamide (AM ) inihated by the combination of N - (N,'N L dimethylaminomethyl ) acrylamide (DMAAM ) with potassiumpersulfate was stUdied. The rate equation was given as:Rp= Kp[DMAAM]0.5[K2S2O8]0.5 [AM]The overall aCtivation energy was determined to be 27.86 KJ/mol. DMAAMwas shown not only joined the ndox initiahon but also incorporated intO thepolymer chains, so that the high molecular weight 107 of polyaCrylamide was obtained but the distribution of molecular weight was broad. The effect of additives on molecular weight and its distribution has been studied. 相似文献