PET和PEN氧气阻隔性差异原因分子模拟探索

利用量子力学、分子力学及分子动力学等方法,对聚对苯二甲酸乙二醇酯（PET）和聚对萘二甲酸乙二醇酯（PEN）静态和动态结构进行了比较研究。分子模拟计算结果表明,PET与PEN的二元酸单体及单个聚合链的结构相似,但是,这两种聚酯在聚集态方面存在较大差别。PET链段柔顺性较好,容易相对运动,氧气扩散时形成临时性的气体通道,因而阻隔性能较差。而PEN链段的萘环体积庞大,刚性较强,较难形成气体通道,因而具有较好的阻隔性能。     

基于红外光谱的涤/棉混纺比定量分析

为了进行红外光谱定量分析纤维含量的研究,测试了涤纶、棉和不同比例涤/棉混合物的红外光谱图,探讨了红外光谱定量分析涤/棉混纺比的方法。研究表明,2 900、1 717、721 cm-1特征吸收峰面积与涤/棉混合物中涤纶含量的线性关系不明显。以上述3个特征吸收峰面积为参量,构建了6个特征值,其中4个特征值与涤/棉混合物中涤纶含量的线性相关性较好。验证实验表明,第6个特征值与涤纶含量的线性相关性最好,利用该特征值与涤纶含量的线性方程可确定涤/棉混合物中涤纶的含量。     

乙醇胺改性酰亚胺聚酯聚氨酯的合成及性能

提出了一种制备酰亚胺聚酯聚氨酯的新工艺。首先以乙醇胺与均苯四酸二酐为反应原料、二甲基甲酰胺为反应介质,中间体生成阶段采用冰水浴和逐步加料的方法,合成了一种酰亚胺二元醇单体;然后用该单体与己二酸、三羟甲基丙烷共缩聚反应制备酰亚胺聚酯多元醇,再与多异氰酸酯交联反应制备酰亚胺聚酯聚氨酯。结果表明,酰亚胺聚酯多元醇与未改性的聚酯多元醇相比有较高的粘流温度和特性黏数、相近的溶解性能,同时具有更高的热分解稳定性和耐溶剂性,期望在高耐热级绝缘材料领域获得更广泛的应用。     

Interface controlled current injection in hydrazone doped polyesters

The current injection properties of gold contacts fitted to hydrazone doped polyesters (HDPs) have been investigated using a series of thin-film Au/HDP/Al diode structures. Current-voltage characteristics of the HDP diodes recorded over a range of temperatures suggest that the measured injection is controlled by interface states which assist in the transfer of hole charge between the Au electrode and highest occupied molecular orbital (HOMO) of the hydrazone. Injection assistance occurs due to the energetic location of the interface states which are estimated to lie between the Fermi energy of the Au and the HOMO of the hydrazone. The density of the interface states is found to be independent of the hydrazone doping concentration used in the diodes and is calculated to be about 3 × 10¹⁶ cm^-3. The available density of interface states which participate in the injection process may be progressively reduced through exposure of the Au electrode to increasing amounts of ultraviolet radiation. The diminished current injection following ultraviolet exposure is fully restored after a sufficiently long recovery period of several hundred days at room temperature. A charge transfer model that involves depopulation of the interface states to nearby hydrazone sites is proposed to explain the ultraviolet phenomena.     

Study on Novel Polyester/Epoxy Powder Coatings for Energy Conservation

Thermosetting polyester/epoxy powder coatings have the advantages of solvent-free and pollution-free,however traditional thermosetting polyester/epoxy powder coatings cured at temperature between 180℃ to 200℃.It not only increased energy consumption but also negatively affected substrate sensitive to heat.Therefore,in this paper,a novel polyester/epoxy powder coatings were prepared by unsaturated polyester (UP) with groups cured at low temperatures synthesized by ourselves,and the effects of the synthesis of UP,the coating formulations and the curing system on the properties of the novel powder coatings were discussed.Meanwhile we tried to reduce the curing temperature and improve the storage stability of the coatings based on the excellent performances of the film to achieve energy conservation.     

海泡石的剥离改性及阻燃不饱和聚酯

为获得低烟无卤阻燃不饱和聚酯(UPR),采用将改性海泡石与膨胀型阻燃剂复配的方式对UPR进行阻燃性能研究.通过酸热处理和离子交换改性法获得了剥离效果良好的有机化改性海泡石纤维,通过扫描电镜、X射线衍射、傅里叶红外光谱等测试方法对改性海泡石的表观形貌、剥离效果及其UPR中的分散效果进行了表征.将改性海泡石与聚磷酸铵(APP)、季戊四醇(PER)等膨胀型阻燃剂进行复配添加到UPR中,极限氧指数(LOI)测试和烟密度(SDR)测试结果表明,所制得的海泡石/不饱和聚酯复合材料具有较好的阻燃、抑烟性能.     

高模量低收缩聚酯帘线的开发与应用

介绍了高模量低收缩聚酯帘线的开发应用情况,采用性能优异的尺寸稳定型聚酯帘线替代人造和标准型聚酯帘线生产轻载及轿车子午线轮胎,可提高产品质量和实现轻量化,而且可简化生产工艺,提高生产效率,使轮胎的生热降低,节油率提高,操纵稳定性好。     

本器底漆用气干型不饱和聚酯树脂的研制

本文主要介绍气干型不饱和聚酯树脂的合成配方及工艺,探讨原料对树脂性能的影响,并阐述其在木器底漆中的应用。     

聚酯树脂和粉末涂料

概括了粉末涂料的优点,技术发展趋势,交联剂的类型、以聚酯树脂以及单体对树脂和涂层性能的影响。     

对真空喷淋水系统进行杀菌灭藻的实验

分析聚酯生产中真空波动的原因 ,介绍了向真空喷淋水系统循环冷却水中投入杀菌灭藻剂来改善真空能力的实验