Mechanism study on char formation of zinc acetylacetonate on ABS resin

The mechanism of char formation effect of zinc acetylacetonate(Zn(acac)2) on acrylonitrile-butadiene-styrene copolymer(ABS) was studied. Thermal gravimetric analysis(TGA) was used to study the mass loss and char yield of ABS composites. In situ temperature-dependent Fourier transform infrared spectroscopy(FTIR) was used to characterize the chemical change during thermal decomposition. Roman spectroscopy and scanning electron microscopy(SEM) were applied to characterize the structure and morphology of the char after combustion. Results showed that the presence of Zn(acac)2 not only slowed down thermal decomposition of the ABS composites, but also increased the charred residue. A more compact and denser char layer with higher graphitization degree was formed for ABS composites with Zn(acac)2. To study the char formation mechanism of Zn(acac)2 on ABS, thermal decomposition was analyzed for the composites of Zn(acac)2 with PB, PS and SAN, respectively. Also, the chemical structure change was investigated for Zn(acac)2 during thermal decomposition. Based on these results, it was deduced that the increase of char yield of ABS composites was probably attributed to the interaction between the units of acrylonitrile in ABS and zinc acetate, produced during the thermal decomposition of Zn(acac)2. A proposed mechanism for crosslinking and the subsequent char formation was presented.     

具有双峰泡孔结构的聚合物微发泡材料研究进展

聚合物发泡材料因其多孔结构及轻量化、冲击韧性好、隔热、吸音等性能而广泛应用于包装、建筑、隔热、吸音、组织支架、吸油等领域。相比于含单峰泡孔结构的发泡材料,具有双峰泡孔结构的聚合物微发泡材料因小泡孔可以提供良好的力学性能、隔热性能等,而大泡孔能够降低材料的表观密度,表现出更优异的性能。近年来,含双峰泡孔的微发泡材料备受关注。本文综述了具有双峰泡孔结构的聚合物微发泡材料的最新研究进展,包括双峰泡孔结构的制备方法、性能及其在力学、吸声、隔热以及组织工程等领域的应用,以及值得深入研究的问题和未来发展前景。