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

首次杂多酸为催化剂采用酯化法合成丙二单乙醚乙酸酯。

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

（） ，，丙二，羟乙基纤维素， Tetrasodium乙二胺四乙酸，柠檬酸，甲酸钠。

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

，十六，丙二，十二烷基硫酸钠，硬， Methylparaben ， Propylparaben ， Butylparaben 。

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

对甲磺酸为催化剂,通过苄叉丙酮与-1,2-丙二反应合成了苄叉丙酮-1,2-丙二缩酮。

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

研究了聚对二甲酸丙二酯(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.

本文介绍了聚对二甲酸丙二酯(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。