乙烯-1-辛烯共聚物增韧应用研究

介绍了聚烯烃系弹性体（POE）的特点及其在PP增韧改性中的应用，同时还报道了马来酸酐接枝的POE在极性聚合物复合体系中的应用研究。     

A minimal kinematic model for serial robot calibration using POE formula

Traditional methods based on the product of exponentials (POE) formula are parametrically continuous and complete for the calibration of the kinematic parameters of serial robots. However, these methods are not minimal due to the constraints of joint twists. This paper puts forward a new POE-based model, whose parameters are totally independent and conform to the formula of minimality. This is the first model that simultaneously satisfies the requirements of parametric continuity, completeness, and minimality with uniform and generic modeling rules. The proposed approach avoids the operations of normalization and orthogonalization which are necessary redundancy elimination steps with the traditional model. Simulations on a SCARA robot and experiments on an ABB IRB 120 robot prove that the new model outperforms in convergence, accuracy, and efficiency.     

Rubber‐toughened polypropylene nanocomposite: Effect of polyethylene octene copolymer on mechanical properties and phase morphology

Rubber‐toughened polypropylene (PP)/org‐Montmorillonite (org‐MMT) nanocomposite with polyethylene octene (POE) copolymer were compounded in a twin‐screw extruder at 230°C and injection‐molded. The POE used had 25 wt % 1‐octene content and the weight fraction of POE in the blend was varied in the range of 0–20 wt %. X‐ray diffraction analysis (XRD) revealed that an intercalation org‐MMT silicate layer structure was formed in rubber‐toughened polypropylene nanocomposites (RTPPNC). Izod impact measurements indicated that the addition of POE led to a significant improvement in the impact strength of the RTPPNC, from 6.2 kJ/m² in untoughened PP nanocomposites to 17.8 kJ/m² in RTPPNC containing 20 wt % POE. This shows that the POE elastomer was very effective in converting brittle PP nanocomposites into tough nanocomposites. However, the Young's modulus, tensile strength, flexural modulus, and flexural strength of the blends decreased with respect to the PP nanocomposites, as the weight fraction of POE was increased to 20 wt %. Scanning electron microscopy (SEM) was used for the investigation of the phase morphology and rubber particles size. SEM study revealed a two‐phase morphology where POE, as droplets was dispersed finely and uniformly in the PP matrix. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99: 3441–3450, 2006     

交联剂DCP用量对POE硫化胶性能的影响

主要研究了聚烯烃弹性体(POE)的交联及补强后的力学性能情况,探讨了交联剂过氧化二异丙苯(DCP)的用量对POE力学性能的影响及其对POE硫化胶补强体系力学性能的影响.结果表明,DCP交联POE后,POE的主要力学性能都比未交联前有所下降;在用白炭黑、炭黑补强后,最佳DCP用量为2份.     

Microstructures and mechanical properties of polypropylene/polyamide 6/polyethelene-octene elastomer blends

A series of polymer blends were designed and manufactured. They are composed of three phases: polypropylene (PP), polyamide-6 (PA6) and polyethylene-octene elastomer (POE) grafted with maleic anhydride. The weight fraction of PA6 was adjusted from 0 to 40% by increments of 10%, and the weight fraction of POE was systematically half that of PA6. The morphology, essentially made of PA6 particles dispersed in the PP matrix, was characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In the extruded plates prepared with the blends, the shape of the dispersed PA6 particles showed an elongated ellipsoidal shape, whose aspect ratio increased somehow with alloying content. The POE modifier was observed both as a thin interlayer (less than 100 nm thickness) at the PP/PA6 interface, and as a few isolated particles. The elastic modulus and yield stress in tension are nearly constant for PP and blends. By contrast, the notched Izod impact strength increases very much with alloying content. This remarkable effect is interpreted in terms of POE interphase cavitation, enhanced plastic shear deformation and resistance of PA6 particles to crack propagation.     

弹性体/纳米CaCO3改性聚丙烯复合材料的研究

通过研究EPDM、POE和纳米CaCO3改性聚丙烯的复合体系，讨论了弹性体和纳米CaCO3对复合材料综合性能的影响。结果表明，弹性体的加入使体系的冲击强度有很大提高，拉伸强度和弯曲强度明显下降；当再添加8份左右的纳米CaCO3时，复合体系的拉伸强度和弯曲强度都得到较大改善。通过扫描电子显微镜(SEM)观察，进一步验证了纳米CaCO3的补强作用。     

PP/POE/Nano-CaCO3复合材料的动态力学热分析

采用熔融共混工艺制备了聚丙烯(PP)／聚烯烃热塑性弹性体(POE)／纳米CaCO3复合材料。用动态力学试验方法研究了PP／Nano-CaCO3、PP／POE和PE／POE／Nano-CaCO3复合材料的动态力学特征。结果显示：PP／Nano-Ca-CO3PP／POE二元体系的低温内耗峰强度均比PP大；PP／POE／Nano-CaCO3三元复合体系的低温内耗峰强度较之二元体系明显增强，在PE／POE／Nano-CaCO3复合体系中，POE及Nano-CaCO3共同作用使体系tgδ1转变峰逐渐消失，tgδ2峰变宽、增强。利用扫描电子显微镜观察了不同体系的形态，三元复合体系由纯PP的耗能少的空洞化断裂方式逐步向耗能多的基体层屈服方式变化；质量比为100／10／10的PE／POE／Nano-CaCO3复合材料的低温内耗峰强度最大，冲击强度较纯PP提高了178％。     

POE熔融挤出接枝MAH的研究

采用熔融法制备POE接枝MAH，利用红外光谱对其结构进行表征。考察了MAH和过氧化二异丙苯（DCP）用量对接枝率及熔融指数的影响。实验结果表明，MAH用量增加，接枝率逐渐增大，熔体流动速率逐渐下降；随着引发剂用量的增加，接枝率也随之增加，熔体流动速率却显著下降。同时对POE接枝MAH的机理进行了探讨。     

PP/弹性体/无机纳米粒子复合材料的研究进展

概述了目前PP 弹性体 无机纳米粒子三元复合体系的研究进展情况,包括:基体树脂的选择与改性、弹性体尤其是新型聚烯烃弹性体(POE)的应用、无机纳米粒子对复合体系的影响、增韧增强机理的研究等。     

泰安天地广场游人行为研究

作为泰山西路登山之始的泰安天地广场,具有游客集散、市民游憩休闲、泰山文化展示等职能.利用实地观察、抽样调查问卷及访谈等研究方法,对广场游人使用状况进行了评价,并针对问题提出了相应的改进性建议.