材料工程
材料工程
재료공정
JOURNAL OF MATERIALS ENGINEERING
2009年
12期
17-21
,共5页
张悦周%张广成%赵玺浩%何祯
張悅週%張廣成%趙璽浩%何禎
장열주%장엄성%조새호%하정
聚酯铵盐前驱体%热环化%特征峰%吸电子基团
聚酯銨鹽前驅體%熱環化%特徵峰%吸電子基糰
취지안염전구체%열배화%특정봉%흡전자기단
poly(ester-amine salt)s precursor%thermal cycloimidization%characteristic peak%electron with-drawing group
以三种不同结构的聚酯铵盐前驱体为研究对象,采用傅里叶变换红外光谱研究前驱体的热环化过程,运用Gaussian 03程序计算得单体二胺的各原子电荷.结果表明:在170℃以前,前驱体热环化进行的较快,在170℃以后则明显减速;在热环化反应过程中,由于二胺结构不同,三类前驱体的热环化程度存在明显差异.与溶剂形成氢键的二胺的主要电子电荷数差异导致了前躯体热环化程度的不同,电荷数越大,其相应的前躯体环化程度越高.
以三種不同結構的聚酯銨鹽前驅體為研究對象,採用傅裏葉變換紅外光譜研究前驅體的熱環化過程,運用Gaussian 03程序計算得單體二胺的各原子電荷.結果錶明:在170℃以前,前驅體熱環化進行的較快,在170℃以後則明顯減速;在熱環化反應過程中,由于二胺結構不同,三類前驅體的熱環化程度存在明顯差異.與溶劑形成氫鍵的二胺的主要電子電荷數差異導緻瞭前軀體熱環化程度的不同,電荷數越大,其相應的前軀體環化程度越高.
이삼충불동결구적취지안염전구체위연구대상,채용부리협변환홍외광보연구전구체적열배화과정,운용Gaussian 03정서계산득단체이알적각원자전하.결과표명:재170℃이전,전구체열배화진행적교쾌,재170℃이후칙명현감속;재열배화반응과정중,유우이알결구불동,삼류전구체적열배화정도존재명현차이.여용제형성경건적이알적주요전자전하수차이도치료전구체열배화정도적불동,전하수월대,기상응적전구체배화정도월고.
Poly(ester-amine salt)s(PEAS) precursor's cycloimidization to polyimide was important one of two-step polyimide foam plastics producing method. Three different and closely related PEAS were prepared,their thermal cycloimidization to the corresponding imides form was investigated by Fourier transform infrared spectroscopy(FTIR) analysis under isothermal conditions at eight different temperatures, for 30min respectively. The electric charge of different main atoms forming hydrogen bond with solvents was achieved through Gaussian 03 program. The results showed that the degree of cycloimidization of PEAS to polyimide had been calculated from their FTIR spectra.Cycloimidization occured at faster rate before 170℃, after that, this processes decreased gradually. Depending on the nature of diamine, the cycloimidization degree of containing electron with-drawing group like sulfone (PEAS3) and ether (PEAS2) in the diamine was somewhat higher compared with those of PEAS1. The higher electric charges of main atoms of diamine leaded to the higher cycloimidization degree of PEAS precursor.