化学英语论文

impossible between members of different species because genitals of males and females are structurally incompatible or because molecules on the surfaces of sperm and egg fail to bind. A final type of prezygotic mechanism is temporal isolation, in which time-related environmental cues that trigger reproductive processes are different for related species.有时，产生前合子隔离的差异涉及了隔离机制。即，由于生殖器结构不匹配或精卵分子表面不结合而使不同种群成员间不能自然结合。最后一类前合子机制是暂时隔离，与时间有关的环境因素触发了相关物种的不同繁殖过程。

题目：合成和溶液性质高分子两性离子铵betains 摘要：季铵盐， N ， N -二烯丙基氮carboethoxymethyl氮methylammonium氯化物（ 8 ） ，已合成了良好的收益。单体8对聚合反应在水溶液中以过硫酸铵为引发给予聚电解质10 。该聚电解质10对酸性水解了两性聚电解质11日在良好的收益。该解决方案这些性能的聚合物了详细的讨论。该两性聚电解质11显示， “ antipolyelectrolyte ”的行为。 ; 共聚物12季铵盐， N ， N -二烯丙基氮carboethoxymethyl氮methylammonium chlolide （ 8 ）和二氧化硫已合成了良好的收益。该聚电解质12对酸性水解了两性聚电解质13容易在良好的收益。该解决方案性能的这些聚合物中详细讨论。该两性聚电解质13日被裁定为不溶于水，但容易溶解在在场的低分子量的共同盐。该两性聚电解质显示“ antipolyelectrolyte ”的行为;粘度的两性聚电解质增加，增加离子强度，其水溶液的解决办法。

有机化学英语论文Abstract In this work the effects of the microporosity and chemical surfaceof polymeric adsorbents on adsorptive properties of phenol wereinvestigated. Textural parameters of four kinds of polymeric resins namely AB-8 D4006 NKA-II and D16 resin were separately measuredby ASAP 2010. The surface chemistry of these polymeric resins was determined by means of inverse gaschromatography (IGC) and diffusereflectance infrared Fourier transform spectroscopy (DRIFTS). Static equilibrium adsorption experiments were carried out to obtain theisotherms of phenol on the polymeric resins. It was shown that NKA-II and AB-8 resin possessed relatively high BET surface areas andmicropore volumes while D4006 and D16 resin possessed comparatively low BET surface areas and micropore volumes. The results of IGCexperiments revealed that NKA-II resin had extraordinary high specific component of the free energy of adsorption both for polar acetone andbenzene probe and thus extraordinary strong surface polarity compared to the other polymeric resins. It was also found that the isotherm ofphenol on NKA-II was much higher than that on the other polymeric resins due to its strongest surface polarity and largest micropore volumeamong four kinds of resins. These experimental observations indicated that adsorption of phenol on the polymeric resins depended greatly ontheir microporosity and surface chemistry. The well-developed microporosity and the strong surface polarity would improve the adsorptionof phenol on the polymeric resins. 2004 Elsevier . All rights reserved. Keywords: Polymeric resin; Phenol; Porosity; Surface chemistry; Inverse gas chromatography