45钢表面微纳米多尺度结构制备及抗硫化粘污性能研究

采用阳极氧化工艺在45钢表面生成微纳米多尺度结构,分析了温度和氧化剂对45钢表面形貌的影响,通过抗热震性试验、硫化试验研究其表面性能。结果表明：温度降低,微纳结构形成速度变缓,数量较少;加入氧化剂,反应速度加快,表面纳米结构杂乱无序,分布不均匀;硫化试验发现污染物少,腐蚀较轻。     

Evaluation of physical,rheological, and structural properties of vulcanized EVA/SBS modified bitumen

In this study, the performance and modification mechanism of EVA (ethylene‐vinyl‐acetate) modified (EM), EVA/SBS (Styrene‐Butadiene‐Styrene) modified (ESM), and EVA/SBS/sulfur modified (ESSM) bitumens were evaluated. The physical, rheological, morphological, and structural properties were determined before and after aging, and compared with those of base bitumen. These properties were evaluation using conventional physical methods, Fourier transform infrared spectrometer, optical microscopy, dynamic shear rheometer, and bending beam rheometer, respectively. The results showed that sulfur was useful in bitumen, EVA, and SBS modification by forming a vulcanized crosslinking polymer network. The vulcanization improved most of the physical properties of ESM bitumen, especially high‐ and low‐temperature performance, and toughness and tenacity (previously not evaluated in the literature). Meanwhile, vulcanization improved the compatibility between polymers and bitumen and increased the aging resistance of ESM bitumen. Vulcanization reactions took place without new functional groups being presented in the infrared spectrum. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44850.     

共聚氟硅橡胶与PS树脂共混研究

通过共聚氟硅橡胶与PS树脂共混对混炼胶性能的影响进行尝试性研究。分析了PS树脂的添加量和共混工艺对混炼胶性能的影响,得出结论：PS树脂对共聚氟硅橡胶有增强作用,尤其是加入少量硫化剂进行动态硫化,可以提高共混物的拉伸强度,达到对共聚氟硅橡胶增强的效果。动态硫化温度对共混物的性能影响较大。     

硫脲滴定法测定锰

介绍了在硫磷混酸介质中,以硫脲为滴定剂,二苯胺磺酸钠为指示剂测定锰矿石、锰合金中锰元素的方法,用本法测得的结果与三价锰亚铁滴定法（硝酸铵、硫酸亚铁铵法）测得的结果基本一致。     

生物质燃烧设备高温腐蚀问题初探

针对生物质燃烧设备经常涉及的高温腐蚀问题,结合近几年来国内外相关领域对生物质燃烧有关高温腐蚀的研究发展,着重分析其相关的腐蚀机理,影响因素以及相应的减轻措施等。     

影响氟醚橡胶脆性温度的试验因素

按GB/T 1682-1994规定的方法测定了硫化压力、试样裁切方向对氟醚橡胶脆性温度的影响。结果表明:氟醚橡胶的脆性温度不仅与硫化压力有关,而且与试样的裁切方向有关。一般情况下,氟醚橡胶的脆性温度随着硫化压力的增大而略有上升,其垂直压延方向的脆性温度比平行压延方向的脆性温度要低1～2℃,这说明氟醚橡胶具有压延效应。     

动态硫化EPDM/POE制备工艺与性能研究

采用动态硫化的方法制备了三元乙丙橡胶／聚乙烯烃类共聚物(EPDM／POE)热塑性弹性体。初步探讨了动态硫化EPDM／POE的共混温度、硫化剂用量等加工工艺参数对力学性能的影响。其拉伸强度和断裂伸长率随着加工温度的升高而提高；随着剪切速率的提高断裂伸长率增大，拉伸强度先增加后有所下降；提高;EPDM的比例其永久形变降低，同时硬度也下降。     

乙烯基硅油对纯化学发泡硅橡胶泡沫性能影响

乙烯基硅油有较高的乙烯基含量 ,能够提供给硅橡胶泡沫体系更多的活性官能团 ,提高交联效率 ,增加局部交联密度。通过加入乙烯基硅油 ,提高了硅橡胶泡沫材料的密度、硬度和开孔率 ,改善了硅橡胶泡沫的压缩性能 ,拉伸性能有所下降