Propylene glycol monoether acetate was synthesized using heteropoly acid as catalyst for the firsttime.

首次以杂多酸为催化剂采用酯化法成单乙醚乙酸酯。

Benzalacetone 1,2-propylene glycol ketal was synthesized from benzalacetone and 1,2-propylene glycol in the presence of ptoluene sulphonic acid.

以对甲苯磺酸为催化剂,通过苄叉酮与-1,2-反应成了苄叉酮-1,2-缩酮。

Water, Cetyl Alcohol, Propylene Glycol, Sodium Lauryl Sulfate, Stearyl Alcohol, Methylparaben, Propylparaben, Butylparaben.

，十六，，十烷基硫酸钠，硬脂， Methylparaben ， Propylparaben ， Butylparaben 。

Water (Aqua), Glycerin, Propylene Glycol, Hydroxyethylcellulose, Tetrasodium EDTA, Citric Acid, Sodium Benzoate.

（） ，油，，羟乙基纤维素， Tetrasodium乙胺四乙酸，柠檬酸，苯甲酸钠。

The changes of intrinsic viscosity and end carboxyl group content with temperature and time were studied for poly(trimethylene terephthalate)(PTT), PET and CDP.

研究了聚对苯甲酸酯(PTT),PET,CDP在不同温度和时间下的特性粘数和端羧基含量的变化。

This paper introduces the preparing method, the structure, the properties and applications of poly (trimethylene terephthalate) (PTT), and it compared with PET, PBT et al. engineering plastics.

本文介绍了聚对苯甲酸酯(PTT)的制法、结构、性能及应用,并和PET、PBT等工程塑料进行了比较。