聚丙烯

It is relatively difficult to extrusion foaming standard isotactic polypropylene because of its low melt strength.

如何有效提高其&可发性&，即提高发泡体系的熔体弹性是聚丙烯挤出发泡成型中需要解决的最为关键的问题。

The mechanical properties of the rolled and subsequently heat treated isotactic polypropylene were measured by the tensile tests.

借助拉伸试验对轧制和退火后的等规聚丙烯进行了轧向及横向上力学性能的研究。

The isothernia1 crystallization of isotactic polypropylene was studied by means of WAXD and FTIR at different temperatures.

用宽角X射线衍射和傅立叶变换红外光谱仪研究了等规聚丙烯的低温等温结晶。

The low isotactic polypropylene grafted by MAH in the presence of St as comonomer was prepared by solution reaction.

低等规聚丙烯是由等规立构和间规立构组成的嵌段共聚物，具有低的结晶性能、良好的粘接性和加工性能，在胶粘剂领域有着广阔的应用前景。

The low isotactic polypropylene grafted by MAH in the presence of St as com-onomer was prepared by solution reaction.

低等规聚丙烯是由等规立构和间规立构组成的嵌段共聚物，具有低的结晶性能、良好的粘接性和加工性能，在胶粘剂领域有着广阔的应用前景。

By the way, these models were composed of Melt Index, Isotactic Index and Ethylene Content.

随后，关注于聚丙烯牌号切换过程优化策略的研究。

Experiments were conducted to evaluate the influence of the extrusion temperature between 45℃and 105℃ on the structure and properties of isotactic polypropylene after equal channel angular extrusion.

在45℃至105℃挤压温度范围内对等规聚丙烯进行等通道转角挤压，研究了挤压温度对iPP结构和性能的影响。

The results showed that the isotactic index of products using this process can satisfy quality requirements perfectly, the cost of polypropylene is reduced obviously and good benefits are achieve

实施结果表明，采用最佳投用方案生产的各牌号产品等规指数完全满足产品质量要求范围，明显地降低了聚丙烯的生产成本，取得了良好经济效益。

Progress of recent studies on the deformation mechanism for spherulites of isotactic polypropylene in the uniaxial and biaxial orientation process was introduced.

介绍了近来国内外对单向、双向拉伸过程中全同立构聚丙烯晶体内部球晶形变机理的研究进展。

The control of isotactic index of the PP manufacture with high fluid and high impact property was sum.

以高流动、高抗冲聚丙烯生产中等规度的控制为研究对象，对生产中等规度与聚合温度、时间、MFR、乙丙含量、Teal/Donor的函数关系进行了研究分析。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。