选煤废水（CPW）混凝过程中Ca2＋作用特性研究

用硫酸钙和硫酸铝作凝聚剂、PAM作絮凝剂对同一选煤废水（CPW）做混凝试验,测定电动电位和澄清水的SS。通过试验数据和试验现象的分析认为Ca2＋和Al3＋的作用机理不同。Ca2＋是和煤粒表面通过化学键发生化学吸附,即在双电层内产生定位离子吸附,既改变了煤粒的表面电位,又改变了电动电位。考电位随cah浓度的增大而降低,但降幅不大。Ca2＋被沉淀物带走的较少,澄清水中含有大量可循环利用的Ca2＋。必须保证废水体系中Ca2＋浓度足够高才能使Ca2＋具有足够强的与其他离子（如Al3＋、H＋、Na＋、K＋）的竞争性。Ca2＋能降低PAM的利用效率。     

隔热、防腐蚀、装饰涂层体系在车载式安全检查设备上的应用研究

通过太阳光照射试验和碘钨灯模拟太阳光照射试验,获得了“环氧底漆＋环氧中间漆＋太阳热反射辐射双组分丙烯酸涂料”和“环氧底漆＋环氧中间漆＋阻隔型水性隔热涂料”所形成的复合隔热涂层试验数据;设备外表面的隔热涂层通过了耐盐雾、耐酸碱、耐湿热、光泽等性能检测,可以实现产品对涂层体系隔热、防腐蚀、装饰的技术要求。探索出实施复合隔热涂层的工艺过程和操作方法,为车载式安检设备的生产积累了经验。     

酚醛－腐植酸树脂对Cd2＋的吸附性能研究

以泥炭和水溶性酚醛树脂为原料，制备酚醛-腐植酸树脂吸附剂，研究了酚醛-腐植酸树脂吸附剂对Cd^2＋的吸附和解吸性能，讨论了溶液pH值、吸附时间对吸附性能的影响。试验结果表明：酚醛-腐植酸树脂对Cd^2＋具有良好的吸附和解吸特性，并且吸附试验数据大致符合Freundlich吸附等温模型。     

复杂地质条件下巷道交叉点支护技术数值模拟分析

为确定滑动构造区弱粘结围岩巷道扩修的合理方案,优化巷道支护参数,控制巷道变形,采取数值模拟的手段对支护参数进行分析,通过分析比较U29＋2 m锚杆＋注浆、U29＋3 m锚杆＋注浆、U36＋4 m＋注浆锚杆3种复合支护方案,得出U29＋3 m锚杆＋注浆支护方案既满足巷道支护要求,又比较经济合理,采取此种支护方式进行工业性试验,通过巷道扩修后表面位移观测数据可知,该支护方式满足滑动构造应力下巷道支护强度要求,有推广应用价值。     

2—（2—噻唑偶氮）—5—[N,N—二羧基甲基）氨基]苯甲酸的合成及其光度特…

合成了一种新的水溶性显色剂２－（２－噻唑偶氮）－５－［Ｎ，Ｎ－二羧基甲基）氮基］苯甲酸。试验了试剂与、２９种金属离子的显色反应，其中１１种离子能显色；同时测定了试剂的离解常数、试剂与Ｃｕ％２＋，Ｃｏ＾２＋，Ｎｉ＾２＋，Ｐｄ＾２＋，Ｖ（Ｖ）络合物的络合比、稳定常数和摩尔吸光系数等特性数据。     

2－（2－噻唑偶氮）－5－［（N，N－二羧基甲基）氨基］．苯甲酸的合成及其光度特性的研究

合成了一种新的水溶性显色剂２－２－噻唑偶氮）－５－［（Ｎ，Ｎ－二羧基甲基）氨基］苯甲酸（ＴＡＤＣＡＢ）。试验了试剂与２９种金属离子的显色反应，其中１１种离子能显色；同时测定了试剂的离解常数、试剂与ＣＯ２＋、Ｃｏ２＋、Ｎｉ２＋、Ｐｄ２＋、Ｖ（Ｖ）络合物的络合比、稳定常数和摩尔吸光系数等特性数据。     

花生壳对Pb^2＋的吸附特性研究

以花生壳为吸附物质,研究了吸附pH值,吸附时间对3种不同产地花生壳吸附水溶液中Pb^2＋的影响,同时进行解吸研究。研究结果表明：在25℃,Pb^2＋的质量浓度为30mg／L条件下得出最佳吸附pH值为4．5．吸附平衡时间为30min。花生壳对Ph^2＋的吸附符合准二级动力学模型,Freundlich模型能很好的拟合等温吸附试验数据。吸附后的花生壳在600℃灼烧灰化回收,Pb^2＋的回收率达到93％以上。     

基于HART协议的pH分析仪

介绍基于HART原理的新型pH分析仪的设计方法,由pH电极传感器和温度传感器测量H＋浓度,经A/D转换和MCU的分析处理,将实时数据经由HART接口发送至远程终端;运用C＋＋Builder 6制作上位机人机界面,实现远程监控;上位机界面与数据库相连,实现实时数据的存储,方便用户查询并分析历史数据.     

橡胶中铁含量的原子吸收测定

用空气—乙炔火焰原子吸收测定方法，对橡胶中铁含量进行了试验研究：测量条件选择、共存元素干扰试验、消除干扰试验、测量方法拟订和测量误差统计。消除干扰用0．4％CaCO3＋0．4?＋0．33％AbO3＋0．25%ZnO＋0．05％Co。该方法的灵敏度0．17×10-6g/mLFe2O3，相对误差为±3．66％，标准方差±0．0040％。     

内环流反应器多釜串联模型参数与表观气液速度的关联

用回归方法以文献数据为依据,得到内环流反应器多釜串联模型参数与表观气液速度间的关联式：Ｎ＝１．４８４＋５９５．９ｕＬ＋３．６００ｕＧ。     

高密度聚乙烯6300M和2480的耐环境应力开裂性能研究

研究了成型塑料管材的两种牌号的高密度聚乙烯(HDPE)6300M和2480的耐环境应力开裂(ESCR)性能。研究中采用的测试方法为一般弯曲试片法、在管上取样的弯曲试片法和恒定压应变法-压缩环法。根据两种材料测试结果及与其他牌号HDPE测试数据比较,对他们的ESCR进行评价,并讨论和解释了HDPE结构参数,ESCR与韧性形变和脆性断裂之间的联系。     

The effect of processing variables on the environmental stress crack resistance of blow-molded polyethylene bottles

The effects of blow-molding process variables on the environmental stress crack resistance (ESCR) of high-density polyethylene (HDPE) bottles were studied. Experimental design was employed to test the effect of die temperature, mold temperature, molding time, and drop time. Bottles blown at each condition were tested using the internal pressure ESCR test. Through the use of regression analysis, the effect of each variable was quantified. Increasing die temperature, mold temperature, or molding time decreased ESCR. However, increasing drop time increased ESCR.     

Investigations of environmental stress cracking resistance of LDPE/UHMWPE and LDPE/EVA blends

Abstract

Low density polyethylene (LDPE)/ultrahigh molecular weight polyethylene (UHMWPE) and LDPE/poly(ethylene-co-vinylacetate) (EVA) blends were tested and compared with respect to their environmental stress cracking resistance (ESCR) using the Bell telephone test. The time to failure in the ESCR test improved with increasing UHMWPE and EVA content, and considerable improvements were produced when an UHMWPE weight fraction of 0.4 and EVA weight fraction of 0.03 were used. Thermal and morphological studies were conducted, and a relationship between morphological features and composition was established. Furthermore, the failed specimens were further characterised by scanning electron microscopy and fractographic methodology to investigate the failure mechanism for ESCR samples.     

Modeling of the fracture mechanism of HDPE subjected to environmental stress crack resistance test

Environmental stress crack resistance (ESCR) is a commonly used test to characterize cracking failure of high‐density polyethylene in applications such as wires, cables, blow molded containers, and other rigid packaging applications. From a resin design standpoint, it is important to understand the mechanism of environmental stress cracking especially in the case of materials with significantly different ESCR values. Currently, two standard ESCR tests, ASTM D1693 and ASTM F2136, are commonly accepted to measure environmental stress crack resistance of HDPE. An accurate observation of ESC is important to understand the fracture mechanism of samples. In this study, the ESCR performance of six HDPE samples was determined per ASTM D1693. The failed specimens were further characterized by scanning electron microscopy and fractographic methodology to investigate the failure mechanism. HDPE resins with low ESCR values had crack surfaces characterized by shorter and fewer fibrils. A new empirical model to predict polymer ESCR using tie chain concentration with different integration range, and water vapor transmission rate, to characterize detergent diffusion in the crack, was developed. The proposed empirical parameter improves the prediction of ESCR. The ability to predict ESCR performance from resin properties is a beneficial tool for new product development. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

中型散装容器专用树脂的性能

研究了中型散装容器专用树脂高密度聚乙烯QHB07的基本物性、耐紫外光老化性能、耐环境应力开裂（ESCR）性能和流变行为。结果表明：QHB07的200℃氧化诱导期超过100min;经过500h紫外光老化试验后,断裂伸长率基本无变化;ESCR可达5000h;具有良好的加工性能,能够满足生产厂家的要求。     

Investigations of environmental stress cracking resistance of HDPE/EVA and LDPE/EVA blends

HDPE/poly(ethylene‐co‐vinylacetate) (EVA) and low‐density polyethylene (LDPE)/EVA blends were tested and compared with respect to their environmental stress cracking resistance (ESCR) using the Bell‐telephone test. The time to failure in the ESCR test improves with increasing EVA content, and considerable improvements were produced for LDPE/EVA blends while small improvements were observed for HDPE/EVA blends. Thermal, rheological, mechanical, and morphological studies were conducted which established a quantitative relationship between morphological features and composition. Furthermore, the failed specimens were further characterized by scanning electron microscopy and fractographic methodology to investigate the failure mechanism for ESCR samples. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39880.     

HDPE埋地排水管专用树脂的工业开发

根据国家标准、欧洲标准中对高密度聚乙烯(HDPE)埋地排水管材专用树脂的要求,确定了产品的质量控制指标和生产工艺参数。在HDPE淤浆法工艺生产装置上,开发了具有优良的物理性能、加工性能和耐环境应力开裂(ESCR)性能的埋地排水管材专用树脂6360M。6360M屈服拉伸强度大于25 MPa;弯曲模量大于1200MPa;ESCR(F50)在1000 h以上;通过了耐内压性能测试。     

Model prediction of the ESCR of semicrystalline polyethylene: Effects of melt cooling rate

The effects of melt cooling rate on the morphology and environmental stress cracking resistance (ESCR) of a commercial‐grade high‐density polyethylene (HDPE) were investigated by DSC, WAXS, Raman spectroscopy, DMTA, microhardness, and standard Bell test. The results showed exclusion of short chain branches from the crystallites leading to their perfection by decrease in the melt cooling rate. Accordingly, samples' ESCR increased because of the aforementioned crystal thickening. In addition, quantitative evaluation of crystal strength was performed for the first time by microhardness technique. Crystal strength or the required energy for plastic deformation of unit area of the crystals, Δh·?_c, complemented crystal thickening hypothesis. The product of Δh and average crystal thickness, ?_c, was also proportional with storage modulus of the samples at ESCR test temperature. The evaluation of the results using the recently proposed model based on the analogy of crack growth through amorphous phase of semicrystalline polymers in harsh environments with crack growth at adhesive polymer–substrate interfaces showed reasonably good correlation. Finally, the comparison of literature and current research data based on the new model delineated new directions for phenomenon generalization. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

影响聚乙烯管材耐环境应力开裂的因素及对策

讨论聚乙烯(PE)分子量及其分布、结晶度、分子链结构、组分和成型工艺对PE管材耐环境应力开裂(ESCR)性能的影响,并提出改善PE管材ESCR性能的措施