Studies on Swelling Behavior of Wood-Polymer Composites Based on Agro-Waste and Hdpe in Steam and Water at Ambient Temperature

The polymer composites of HDPE and banana, hemp, and agave fibers (50 : 50, w/w) were prepared separately with and without treatment of maleic anhydride. The swelling phenomenon in terms of absorption of water and steam was studied and it was found that the steam penetrates more within a smaller period of time than the water at ambient temperature. The maleic anhydride treatment on these fibers showed the ester-ification of fibers, and because of that, the absorption (swelling) of steam and water is less than the untreated respective fibers composites.     

The Compatibilizing Effect of Maleic Anhydride on Swelling Properties of Plant-Fiber-Reinforced Polystyrene Composites

In this work the fibers of banana, hemp, and sisal are employed as fillers for the formation of wood polymer composites with polystyrene in the different ratios of 40:60 and 45:55 (wt/wt), respectively. These fibers were esterified with maleic anhydride, and the effect of maleic anhydride was studied on absorption of steam and water at ambient temperature in wood polymer composites. Untreated fiber composites show more absorption of steam in comparison to maleic anhydride (MA)–treated fiber composites. The absorption of water increases with the increase in time from 2–30 h in all untreated fiber composites. The maximum absorption of water was found in hemp fiber composites and the minimum in sisal fiber composites. The maleic anhydride esterified fiber composites showed less absorption of water than the untreated fiber composites. Steam absorption in MA treated and untreated fiber composites is higher than the water absorption in respective fiber composites. The wood polymer composites containing low amount of fiber shows less absorption of steam and water at ambient temperature than the composites containing a greater amount of fiber in respective fiber composites.     

马来酸酐苯乙烯双单体接枝聚丙烯的研究

研究了聚丙烯（ＰＰ）采用熔融法接枝马来酸酐（ＭＡＨ）聚乙烯（Ｓｔ）双单体。实验表明,马来酸酐接枝率随其加入量增加而提高;添加两种单体时,马来酸酐添加量保持不变,马来酸酐接枝率随苯乙烯添加量增加而提高。经转矩流变,红外,热失重和差示扫描量热分析表明：马来酸酐,苯乙烯均与聚丙烯发生接枝反应,且有交联网络出现,因此推断出苯乙烯和马来酸酐预先发生交替共聚,共聚物与聚丙烯反应生成最终接枝物。接枝物应用于ＰＰ     

Water modification of PEG-derived VPO for the partial oxidation of propane

In this study, the PEG-derived VPO precursors were subject to water refluxing (90 °C, 8 h) and in situ activation in a steam-containing environment. For comparison, the VPO precursors without water refluxing were also activated in a similar manner. The IR measurement indicated that the majority of PEG in the precursor has been removed during water refluxing, and the VPO is essentially unenwrapped by PEG. The consequence is an increase of particle size and crystallinity of VPO as well as decreases in surface acidity and site density. The activation of catalysts in a stream-containing environment has an influence on the content of V⁵⁺ species and on the reduction behavior of the VPO catalysts. The VPO catalyst activated with 20% water vapor (by volume) in the feed shows the highest crystallinity. Compared with the non-PEG-derived VPO precursor, the PEG-derived one undergoes structure changes of higher severity during the water/steam treatments. The VPO catalyst generated from the PEG-derived precursor with water refluxing and activated with steam (20%) exhibited a propane conversion of 25% and a (AA + HAc) selectivity of 70%. The superior catalyst behavior can be interpreted in terms of the higher crystallinity of the (VO)₂P₂O₇ phase, the lower content of V⁵⁺ species, and the milder surface acidity as caused by the water/steam treatments.     

非增粘型钻井液降滤失剂AM／MA／AMPS共聚物

本文报道的研究结果表明，分子量相对较低的AM／MA／AMPS共聚物可用作钻井液的降滤失剂而不显著增加钻井液的粘度。在本工作中通过考察单体比例、引发剂用量、反应温度等的影响，得出了合成共聚物降滤失剂的最佳配方和条件，考察了所得共聚物在淡水、饱和盐水、钙污染基浆中的降滤失性能及抗温抗污染能力。     

Effect of Rare Earth Additives on the Catalytic Property ofVanadium－Phosphorus Catalyst

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＡｄｄｉｔｉｖｅｓｏｎｔｈｅＣａｔａｌｙｔｉｃＰｒｏｐｅｒｔｙｏｆＶａｎａｄｉｕｍ－ＰｈｏｓｐｈｏｒｕｓＣａｔａｌｙｓｔＬｉＭｉｎｇｘｉｕ（李铭岫）；ＹａｎｇＳｈｕｔａｏ（杨述韬）；ＬｉｕＣｕｉｇｅ（刘翠格）（Ｄｅｐ...     

富马酸二甲酯的合成及应用

本文叙述了富马酸二甲酯的性质、合成方法和用途     

烟草中抑芽丹残留量的测定

采用ISO 4876-1980规定的方法测定了239个国产烟叶、49个进口烟叶和12个进口卷烟样品中的抑芽丹残留量。结果表明:国产烟叶抑芽丹的检出率为6.69%,最高54.00mg/kg,最低1.50mg/kg,平均6.82mg/kg;进口卷烟检出率为58.33%,最高42.75mg/kg,最低7.75mg/kg,平均17.57mg/kg;进口烟叶检出率为30.61%,最高14.00mg/kg,最低1.50mg/kg,平均5.63mg/kg。     

Catalytic oxidation of butane to maleic anhydride enhanced yields in the presence of CO2 in the reactor feed

The addition of CO₂ to the reaction mixture for the oxidation of butane over a VPO catalyst gives rise to significantly improved yields of maleic anhydride.     

聚乙烯接枝马来酸酐的研究

研究了在引发剂存在下聚乙烯接枝马来酸酐的反应，用红外光谱法证明了接枝反应的存在，通过正交实验优选出了接枝条件，考查了接枝聚乙烯的粘接强度．