甲醛溶液

From solution polymerization, polymers are tokened using MALDI-TOF-MSand IR spectrum. The structure of polymers are confirmed and obtain 2-28 repeatunits of poly(p-aminobenzaldehyde). The tip of polymer molecule still have one-NH_2 and one -CHO. To a certainty condtion, this polymer can polymerization tocreat even more molecular weight.

对溶液聚合得到的聚合物进行了飞行时间质谱和红外光谱表征，确定了聚合物分子的结构，测得了聚对氨基苯甲醛的2-28个重复单元，且聚合物分子末端还保留有一个-NH_2和一个-CHO，在一定条件下可以进一步缩合生成更高分子量的聚合物。

The concentration of the gas could be achieved by measuring the change of the conductivity. In the experiments, the gas sensor was prepared by spreading the water solution of carbon nanotubes between the interdigitated Au electrode, which was splashed on alumina. In this paper, three methods, such as mixing palladium and copper chloride, deoxidizing palladium and copper by chemical and electrochemical means, were used to doping palladium and copper in multi-wall carbon nanotubes.

实验中我们采用单壁和多壁纳米碳管作为敏感材料，在叉指金电极间涂布纳米碳管悬浊液作为气敏膜，用于有机挥发物如甲醛、苯、甲苯和二甲苯的检测，并着重研究了掺杂氯化钯和氯化铜盐溶液、化学和电化学方法掺杂钯和铜金属颗粒对多壁纳米碳管传感器的气敏性能的影响。

It is converted to a series of polyamides and polyesters by means of low-temperature solution polycondensation and interfacial polycondensation.

以间二甲苯和多聚甲醛为原料合成了芳香性螺双内酯单体――5，5′-二甲酰氯-7，7′-二氧-2，2′-螺双，并通过常温溶液缩聚和界面缩聚合成了一系列聚酰胺和聚酯。

The silver-coated copper power was prepared by chemical reduaction and ball grinding to make flakproduct.

采用化学还原反应制备镀银铜粉，并讨论了银氨溶液浓度和甲醛浓度对制备镀银铜粉的影响。

Guangzhou City in Lilongwe cabinet factory as the development of a new cabinet plate, He has a way of overcoming the marble of the radiation, Fanchao not waterproof and moisture-proof plate issue, with the following characteristics: 1, waterproof moisture-proof, 100% waterproof, available Direct water rinse. 2, anti-Chongzhu: no need for cockroaches, termites are worried about the invasion. 3, non-toxic pollution-free: non-radiation, formaldehyde and other harmful substances. 4, Naisuan Jian: The acid-base solution flushing are not impaired. 5, high-intensity long life: and moisture-proof material such as plate compared to the use of time can be increased more than five times. 6, a good process: the use of ordinary woodworking tools can manufacture.

广州市万利隆厨柜厂最新开发出一种新型厨柜板，他很好地克服了大理石的辐射，返潮和防潮板不防水问题，具有如下特点：1，防水防潮，100%防水，可用水直接冲洗。2，防虫蛀：不必为蟑螂，白蚁的侵袭而担心。3，无毒无污染：不含辐射，甲醛等有害物质。4，耐酸碱：用酸碱溶液冲洗不会受损。5，强度高使用寿命长：与防潮板等材料相比，使用时间可提高5倍以上。6，良好的加工性：使用普通木工工具就可以加工制作。

Melamine formaldehyde resin is a thermosetting polymer,spinnability and flexibility of fiber are poor.

三聚氰胺甲醛树脂是热固性高聚物，成纤性差，成纤纤维韧性差；通过苯代三聚氰胺、聚乙烯醇对三聚氰胺树脂进行改性，提高了树脂溶液的可纺性，所制纤维的柔韧性得到了提高。

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。