terminal carboxyl group

In this sort of nanoparticle probes, the long PEG chain provide steric stabilization to the probes so that they could survive in adverse conditions; whereas, its terminal carboxyl group could bind target entity, which imparts detection/ recognization functionality to the probes.

其中，聚乙二醇高分子链为探针空间稳定，使之可以耐受较苛性的条件；其端位的羧基可与抗体等靶向实体结合，从而赋予探针检测识别功能。

The content of terminal carboxyl group can be controlled under the optimal conditions as followed: catalyst concentration 120 μ g/ g, esterification temperature 240 ℃, stirrer rotary speed of final condensation reactor 5 r/ min.

控制PBT端羧基含量的最佳工艺为：催化剂浓度120μg／g，酯化温度240℃，终缩聚釜搅拌器转速5r／min。

The results showed that the thermal properties and relative molecular weight distribution had no evident effect on the spinnability of PBT when the content of terminal carboxyl group had a profound effect.

结果表明，PBT的热性能和相对分子质量分布对可纺性影响不明显，而其端羧基含量影响显著。

A fiber-grade PBT was prepared from purified terephthalic acid by esterification. The effect of the performance of PBT on the spinnability was discussed by variance analysis. The influential factors on the terminal carboxyl group content of PBT were studied by orthogonal experiments.

采用精对苯二甲酸酯化法制备纤维级PBT，利用方差分析方法比较了PBT性能对可纺性的影响，并对PBT端羧基含量的影响因素进行了正交试验。

Study on factors affecting carboxyl terminal group content of polytrimethylene terephthalate

PTT端羧基含量的影响因素研究