乙烯的

Based on the coordinate bonding theory, a hydrophobic expansible polytetrafluoroethylene membrane was modified to make it hydrophilic.

采用配位键合理论对疏水性膨体聚四氟乙烯膜膜进行亲水改性，并对其用于水过滤过程的性能进行了研究。

Therefore, the mechanical properties of mortar can be improved efficiently by adding polyvinyl acetate.

因此，掺入聚醋酸乙烯能有效改善砂浆的变形力学性能。

Aim To improve the water tolerance and low temperature resistance of polyvinyl acetate emulsion.

目的 改进聚醋酸乙烯酯乳液耐水性和耐寒性差的缺点。

Polyvinyl acetate or its derivatives may also be employed in the adhesive formulations to reduce weight loss during cure.

聚乙酸乙烯酯或者其衍生物也可以用于该粘合剂配方以减少在固化期间的重量损失。

The polyvinyl acetate and polyvinyl alcohol used are ideal restoring materials obtained by numberless screening.

聚醋酸乙烯和聚乙烯醇是经过无数次筛选的理想修补材料。

The method of emulsion polymerization was used to synthesize polyvinyl acetate resin by adding hard monomer_methyl methacrylate to modify it.

本论文采用乳液聚合的方法合成了聚醋酸乙烯树脂，并通过加入硬单体―甲基丙烯酸甲酯对其进行改性。

The results of TG indicate that blending Polyvinyl acetate and polypropylene can improve the thermostability of PVAC.

热重的结果表明，聚醋酸乙烯酯与聚丙烯共混后，其热稳定性增加。

This paper delivered the relationships of uniaxial tensile and compressive stress with strain and bending properties,and felt－bending strength of cement mortar with polyvinyl acetate.

研究掺聚醋酸乙烯水泥砂浆的轴拉和轴压应力—应变关系、抗弯性能以及长期粘结抗弯强度。

Polyvinyl acetate resin was prepared by suspension polymerization, and modified to carboxymethylated polyvinyl alcohol resin after several steps of reaction.

以悬浮聚合方法合成大孔聚醋酸乙烯酯树脂，通过一系列反应修饰成弱酸性阳离子交换树脂，表征了树脂的性能。

The reaction products of ethylene hydroformylation on the three kinds of catalysts were mainly propanal, ethane and propanol.

反应温度、空速、压力及物料配比对乙烯转化率和丙醛选择性均产生一定程度的影响。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。