异戊烷中不饱和烃的测定方法改进

通过增加溴试剂用量和减少样品量的试验,探讨了异戊烷中不同含量不饱和烃的测定方法,可以获得较为准确的分析结果,弥补了原标准规定方法的不足。     

不饱和树脂／炭黑复合材料的制备与性能研究

采用球磨和超声两种制备工艺分别制备了炭黑填充不饱和树脂复合材料，研究和对比了两种不同工艺对复合材料性能的影响。结果表明，两种制备方法得到的复合材料渗滤阀值均在质量分数1．8％。不饱和树脂／炭黑复合材料的拉伸强度和弹性模量随炭黑含量不同而变化，当其质量分数为1％时，两者出现最大值。相比纯的不饱和树脂，球磨法制备的复合材料的拉伸强度和弹性模量提高了89％和95．8％，而超声法提高了38．37％和23．12％。     

Linear and networked polymers formed by the near simultaneous occurrence of etherification and esterification under mild reaction conditions

Despite the large difference in their nucleophilicity, phenoxide and carboxylate anions take part nearly simultaneously in the aliphatic nucleophilic substitution reaction with 1,4‐dibromo‐2‐butene. This leads to the formation of ether (? O? ) and ester (? COO? ) linkages simultaneously under mild reaction conditions when hydroxyl benzoic acids are employed as nucleophiles. The process yields a new class of polymer broadly classified as unsaturated poly(ether ester) which are potentially functionalizable. This methodology has also been extended for preparing networked polymers by making use of 3,5‐dihydroxybenzoic acid as A₃ type monomer. Copyright © 2011 Society of Chemical Industry     

宣化煤田泥岩特征分析及聚煤规律

文章通过分析宣化区泥岩的成分、微量元素及泥岩类型等特征,得出结论:该区泥岩主要形成弱碱性弱还原下的内陆淡水湖泊中。这对恢复该区古环境和掌握煤系的聚煤规律着非常重要的意义。     

THE COOPERATIVE EFFECTS OF COMBINED STABILIZERS ON TRANSPARENT UNSATURATED POLYESTER FRP

The influences of various kinds of UV-absorbers,antioxidants and their mixtures on UV-aging resis-tance of transparent unsaturated polyester FRP arestudied by artificial aocelerating aging test.Theresults show that the UV-aging resistance of com-bined stabilizers is better than single stabilizer.It is concluded that the cooperative effect of UV-absorbers is caused bg the increase of wave leng-th and intensity of the absorption light the coopora-tive effect of UV-absorbers and antioxidants iscaused by Dreventing the photo-oxidantion.     

土壤储水过程及自由孔隙率的初步研究

本文通过室内实验和数值计算对入渗条件下土壤的储水过程进行了模拟,给出自由孔隙率的定义,并对土壤的自由孔隙率在不同因素影响下的变化规律作了初步探讨。     

不饱和聚酯片状模塑料耐漏电起痕性能的研究

在不饱和聚酯片状模塑料中分别加入氢氧化铝和二异氰酸酯预聚物对其进行耐漏电起痕改性。利用扫描电镜对材料被电弧击打后的微观结构进行观察。结果发现未改性不饱和聚酯片状模塑料出现不同程度的烧蚀碳化,而改性后的模塑料电腐蚀痕迹明显减弱,其耐漏电起痕性能明显提高。     

非饱和土水气两相不相容、不可压缩渗流有限元数值分析

讨论了非饱和土中水和气体两相不相容、不可压缩渗流的达西定律及水气两相耦合的渗流运动方程及vanGenuchten土水特征曲线 ,用Galerkin法建立了非饱和土水气两相不相容、不可压缩渗流的有限元方程 ,编制了三维有限元计算程序 ,应用计算实例验证了程序的计算能力 .     

声频振动法测定LPA/UP固化物动弹模量-弯曲强度的试验研究

声频振动法为非破损测试方法。可在聚合物基辣材料同一试件上连续测定由内外因影响其弹性模量的变化规律，进而推算力学性能的变化。具有大大减少试验工作量缩短试验周期的显著优点。本文研究用声频振动法测定低收缩添加剂（LPA）与不饱和聚酯树脂（UP）固化后的动态弹性模量，试验建立动弹模量与弯曲强度的相关关系，并对其进行数学回归分析。据此可推算同类组成体系材料的弯曲强度。试验表明该测定方法经济便捷，并具相当精度。     

硅灰石在不饱和聚酯塑料中的应用研究

本文研究了硅灰石填充不饱和聚酯树脂体系的一些基本性能,进而研究了模塑料的配方和性能并压制了绝缘制品。