众文网1.关于聚丙烯酸钠的英文文献及翻译
Taking acrylic acid, sodium hydroxide as raw material, inorganic phosphate as chain transfer agent on Synthesis of a series of low molecular weight polyacrylate sodium.On the molecular weight of sodium polyacrylate dispersion properties.Study on the optimum amount of dispersing agent and in the optimum amount of clay suspensions under the condition of the property change.
以丙烯酸、氢氧化钠等为原料，以无机磷酸盐为链转移剂合成了系列低分子质量聚丙烯酸钠分散剂。探讨了分子质量对聚丙烯酸钠分散性能的影响。研究了分散剂的最佳用量及在最佳用量条件下瓷土悬浮液的性能变化情况。（可以吗，望采纳）
2.帮忙翻译一下一段有关化工、材料文献的摘要
摘要 结合在水化学和柠檬酸盐络合诱捕效果，经过一个辅助的有机凝胶提供了 简单和迅速的可能性高质量的组份合成氧化粉。
稳定的解决方案的强烈的螯合物阳离子 得到控制，pH值的配体。这些方案是那么容易被原地形成的胶凝聚丙烯酰胺凝胶。
这是直接为积水凝胶热处理，导致罚款和纳米粉体。聚丙烯酰胺凝胶使 柠檬酸过程更简单、更迅速。
化学均匀的粉末，通常很高的过程中，可以提高） 经过有机凝胶的效果。这个过程中，经常用于数以百计的准备工作进行了综合的四个 化合物的例子。
CaAl六铝酸钙的近单相单拍运行了热处理后，阿11008C 1小时在。纯12 19 manganite镁和钡本文MnO La Sr BaZrO形成，分别在10008C 650，。
合成0.8 0.2三3 anorthite CaAl阿斯是一个例子，使用这一过程中对硅酸盐和辛烷值较高水化学无枸橼二2 8 螯合。在10008C无定形的前兆crystallises成六边形anorthite之前任意配对方式转变成稳定状态。
这个 诱捕效果的影响，空间效应的聚丙烯酰胺凝胶便于水化学过程的影响，在同样的方式，同样的概念 可用于其他有机凝胶在有机介质。2001卷有限公司。
版权所有。 关键词：聚丙烯酰胺凝胶、柠檬酸过程；多元氧化物；水、钙hexaluminate;Anorthite合成；Manganites。
3.聚丙烯的外文翻译
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes. An addition polymer made from the monomer propylene, it is rugged and unusually resistant to many chemical solvents, bases and acids.In 2008, the global market for polypropylene had a volume of 45.1 million tonnes, which led to a turnover of about $65 billion （~ €47.4 billion）.[1]聚丙烯（Polypropylene，简称PP）是一种半结晶的热塑性塑料。
具有较高的耐冲击性，机械性质强韧，抗多种有机溶剂和酸碱腐蚀。在工业界有广泛的应用，是平常常见的高分子材料之一。
澳大利亚的钱币也使用聚丙烯制作。Most commercial polypropylene is isotactic and has an intermediate level of crystallinity between that of low-density polyethylene (LDPE) and high-density polyethylene (HDPE). Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as ABS. Polypropylene is reasonably economical, and can be made translucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics. It is often opaque or colored using pigments. Polypropylene has good resistance to fatigue.The melting of polypropylene occurs as a range, so a melting point is determined by finding the highest temperature of a differential scanning calorimetry chart. Perfectly isotactic PP has a melting point of 171 °C (340 °F). Commercial isotactic PP has a melting point that ranges from 160 to 166 °C (320 to 331 °F), depending on atactic material and crystallinity. Syndiotactic PP with a crystallinity of 30% has a melting point of 130 °C (266 °F).[2]The melt flow rate (MFR) or melt flow index (MFI) is a measure of molecular weight of polypropylene. The measure helps to determine how easily the molten raw material will flow during processing. Polypropylene with higher MFR will fill the plastic mold more easily during the injection or blow-molding production process. As the melt flow increases, however, some physical properties, like impact strength, will decrease.There are three general types of polypropylene: homopolymer, random copolymer, and block copolymer. The comonomer is typically used with ethylene. Ethylene-propylene rubber or EPDM added to polypropylene homopolymer increases its low temperature impact strength. Randomly polymerized ethylene monomer added to polypropylene homopolymer decreases the polymer crystallinity and makes the polymer more transparent.[edit] is liable to chain degradation from exposure to heat and UV radiation such as that present in sunlight. Oxidation usually occurs at the tertiary carbon atom present in every repeat unit. A free radical is formed here, and then reacts further with oxygen, followed by chain scission to yield aldehydes and carboxylic acids. In external applications, it shows up as a network of fine cracks and crazes that become deeper and more severe with time of exposure.For external applications, UV-absorbing additives must be used. Carbon black also provides some protection from UV attack. The polymer can also be oxidized at high temperatures, a common problem during molding operations. Anti-oxidants are normally added to prevent polymer degradation.[edit]HistoryPropylene was first polymerized to a crystalline isotactic polymer by Giulio Natta as well as by the German chemist Karl Rehn in March 1954.[3] This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm Montecatini from 1957 onwards.[4] Syndiotactic polypropylene was also first synthesized by Italian Nobel Prize w。
4.论文摘要翻译 急
Objective: To understand and analyze the Nanjing University students know the situation of acrylamide, as carrying out publicity and education to provide knowledge based. On acrylamide in food intake, correlation analysis, a preliminary understanding of the surveyed population exposure levels of acrylamide, and then explore the reduction of acrylamide in food measures. METHODS: The degree of self awareness survey of acrylamide and 24 hours for 3 consecutive days using dietary recall method in the investigation of human exposure to acrylamide. Nanjing randomly selected within five college students (Nanjing Medical University, Nanjing Agricultural University, Nanjing Normal University, Nanjing University, Nanjing University of Finance) for 1000 in Knowledge of survey, 500 survey of dietary exposure. Results: The degree of actual knowledge of the investigation was completed in 1000, dietary exposure to 439 copies of the investigation. Results of the investigation known degree: 65.3% students never heard of acrylamide; 22.3% of the students have heard of but do not know; 7.3% of the students know what is but do not know the harm; 5.1% of the students know the dangers. No difference between male and female students aware of degree (p = 0.248> 0.05), but the medical class of students know better than non-medical students (p = 0.006 <0.05). Dietary exposure to the results of the survey: major college students in Nanjing, the average exposure of acrylamide was 1.49% μg / kg / bw / d; minimum exposure to 0.00% μg / kg / bw / d; maximum exposure to 20.80 % μg / kg / bw / d. World Health Organization and the International FAO estimated amount of acrylamide exposure to 0.8μg / (kg / bw / d), this as a reference value, 46.2% of students exposed to higher than the reference value. Conclusion: The major Nanjing University students aware of acrylamide exposure low and high. [Keywords]: acrylamide; unknown degree; exposure 欢迎采纳，记得评价哦。
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