聚醋酸乙烯类梳型分散剂的制备与表征

颜料在工业生产和人们的日常生活中起着重要的作用.由于颜料颗粒具有较大的比表面积和较高的比表面能,是热力学不稳定体系,当分散在介质中时容易发生团聚,影响其特性的发挥[1],因此需加入分散剂使其在分散介质中稳定分散.     

哈林图的弱点边染色

假设e1和e2是两条相邻边,若它们关联同一个面且在该面的边界上连续出现,则称e1和e2是面相邻的.平面图G是弱点边k-可染的是指存在映射π:V (G)∪E(G)→{1,···, k},使得任意两个相邻的顶点,任意两条面相邻的边,以及任意两个相关联的顶点和边都染不同的颜色.文中利用数学归纳法证明了:哈林图(Halin graph)是弱点边5-可染的,并给出可达到上界5的例子.     

经γ射线辐照的LLDPE与氢氧化铝体系冲击性能的研究

研究了γ射线剂量率对线性低密度聚乙烯（ＬＬＤＰＥ）氧化与降解的影响和ＬＬＤＰＥ／γ－ＬＬＤＰＥ／ＡＴＨ（氢氧化铝）体系的冲击性能。结果表明，剂量率越低，ＬＬＤＰＥ氧化和降解的程度越高。γ－ＬＬＤＰＥ的加入可明显改善ＬＬＤＰＥ和ＡＴＨ的相容性，提高ＬＬＤＰＥ／ＡＴＨ体系的冲击强度，改善ＡＴＨ在ＬＬＤＰＥ树脂相中的分散性。     

A STUDY ON MECHANICAL PROPERTIES OF γ-RAY IRRADIATED HDPE FILLED WITH SERICITE-TRIDYMITE-CRISTOBALITE*

The effect of γ-ray irradiation on the mechanical properties of high densitypolyethylene(HDPE) filled with sericite-tridymite-cristobalite(STC) was studied. The ex-perimental results show that γ-ray irradiation can improve the affinity between HDPE andSTC, and the dispersion of STC in HDPE matrix. Compared with HDPE/STC (80/20)blend, the yield stress and impact strength of irradiated HDPE (10kGy)/STC (80/20) blendare increased from 22.8 MPa and 70J/m to 28.5 MPa and 144J/m. The yield stress andimpact strength of HDPE/irradiated HDPE/STC (48/32/20) are 27.8MPa and 210J/m,respectively.