新型无VOC可再生成膜助剂

特殊的高纯度脂肪酸酯及其混合物可用于制备较低气味,无VOC,可再生的成膜助剂.这种成膜助剂可以提高极低VOC涂料中乳液的效果.实验证明:与非再生成膜助剂相比,该新产品不仅能降低配方的综合成本,还能明显提高性能.     

Experimental Studies on Thermo-Mechanical Behavior of Ultrasonically Welded PC/ABS Polymer Blends

This research paper attempts to investigate the performance of blended PC/ABS joints using the ultrasonic material joining process. The key focus is on examining the thermal aspects during the joining of PC/ABS blends using ultrasonic welding and the subsequent mechanical testing to determine the strength of the weldments. Thermal behavior of the blends during welding may govern or alter the mechanical properties and integrity of the joints. Hence, investigations on thermal characteristics involved in PC/ABS blends when subjected to high vibrational heat generated during the ultrasonic welding process is imperative. DSC is used to measure the glass transient temperature (T_g) after subjecting it to welding. Mass loss is calculated with TGA. TGA and DSC results indicate change in T_g which are attributed to the molecular alignment occurring when the specimens are subjected to ultrasonic vibrations. Initially, two step mass losses occur that is contributed by ABS in which long single chains are associated and alters PC. SEM images reveal the absence in intermolecular compounds or impurities that tend to weaken weld joints. The diffusion of these molecules is uniform in the welded region. The amorphous nature enhances the integrity of weld joints. Molded part illustrates the higher strain rate in comparison with the welded specimens. The RSM model proposed is sufficient and has limited possibility for violating the independence or the assumption of constant variance.     

Effect of Silicon Segregation in the Argon Arc Welded Incoloy 20 Superalloy

Silicon - Incoloy 20 is prone to hot cracking due to micro-segregation of alloying elements. The aim of the work is to investigate the chances of curtailing the micro-segregation of elements using...