醋酸乙烯酯

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。

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。

Polyvinyl acetate emulsion is low cost,easy to produce,high bonding strength,environment friendly but poor water resistance.

聚醋酸乙烯酯乳液价格低、生产方便、黏合强度大、环保，但是其耐水性不好。

The material of polyvinyl acetate is adopted, and combinations of axial strain rate and pressure under various temperatures were considered in the analysis of the thermoviscoelastic response.

本文选用材料为聚醋酸乙烯酯或简称PVAC，进行分析温度变化下承受轴向应变率及常围压，并藉不同之组合，以探讨高分子材料热黏弹反应。

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 corrugated paper honeycomb sandwich was fabricated with corrugated paperboard of different flute and base weight using polyvinyl acetate emulsion,and impact test was carried out to study their dynamic performance.

比较了瓦楞结构蜂窝夹层和普通蜂窝夹层用纸量的差别，用聚醋酸乙烯酯乳液作为黏合剂，使用不同楞型和定量的瓦楞纸板制得瓦楞结构蜂窝夹层，利用冲击实验机研究其动态性能。

This article studied dispersion polymerization of the vinyl acetate in alcohol/water medium, choose potassium persulphate-sodium bisulfite as oxidized-reduction initiator.

研究了醋酸乙烯酯在醇／水介质中以过硫酸钾－亚硫酸氢钠为氧化－还原引发剂的分散聚合。

The following was studied in this paper:(1) The adhesive strength of polyvinyl alcohol with different degree of polymerization and different degree of alcoholysis (2) The adhesive strength of polyvinyl acetals with different acetalization degree (3) Effects of polyvinyl acetate on adhesive strength of white glue when PVA or polyvinyl acetals was used as its protective colloid.

本文主要研究以下内容：(1)不同聚合度、醇解度聚乙烯醇溶液粘接强度；(2)不同缩醛度的聚乙烯醇缩醛溶液的粘接强度；(3)聚乙烯醇或聚乙烯醇缩甲醛为保护胶体时，聚醋酸乙烯酯乳液的粘接强度，以及研究白乳胶改性物，制备高粘度和高粘接强度的白乳胶。

With cerous ammonium nitric-ethylene diamine tetraacetic acid as an initiator, and with the protection of the nitrogen the graft-copolymerization of methylacrylic acid and vinyl acetate on chitosan grafting was studied.

以硝酸铈铵－乙二胺四乙酸为引发剂，在N2气的保护下，研究了壳聚糖与甲基丙烯酸和醋酸乙烯酯两种单体的接技共聚反应。

Of the total mass of the white glueto copolymerize with vinyl acetate can produce white glue whose apparent viscosity is 13-65 Pa·s,and its adhesive strength and to boiling water-resistant are obviously enhanced compared with the white glue without adding VB in the same preparing conditions.

56%的VB与醋酸乙烯酯一起共聚，可制得表观粘度为13～65 Pa·s的白乳胶，而且其粘接强度和耐沸水性都比相同条件下制备的不加VB的白乳胶明显提高。

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。