摘要
利用傅里叶变换红外光谱、碳核磁共振光谱、示差扫描量热(DSC)分析和熔体流动指数对国外4种工业化生产的无规共聚聚丙烯(PP-R)专用料(1#,2#,3#,4#)进行了组成和结构分析。分析结果表明,PP-R专用料是由丙烯和乙烯无规共聚而成,在无规共聚物中不存在乙烯结晶。通过比较可知,4种PP-R专用料有相似的乙烯含量、结晶熔融温度和熔体流动指数,但从DSC恒温结晶分级实验观察到,4#专用料表现为大而宽的熔融峰,表明乙烯在聚丙烯主链上的分布是较均一的。同时乙烯的含量以及乙烯插入丙烯链中相连点的数目是控制PP-R专用料质量的关键。该结果可为提高国内PP-R专用料的质量提供参考。
Composition and microstructure of four different imported commercial random ethylenepropylene copolymer（PP-R） special resins （ 1^#, 2^#, 3^#, 4^# ） were characterized by means of ^13C NMR, FTIR, DSC and melt flow index （MFI）. The four PP-R special resins were propylene-ethylene random copolymers. There was no polyethylene crystal in PP-R special resins. Contents of ethylene in four PP-R special resins were same. Melting temperature and MFI of four samples were also similar. However, a strong and broad melting peak for 4^# sample could be observed by stepwise isothermal crystallization test, which showed that ethylene was homogenously distributed in polypropylene main chains. The optimum properties of PP-R special resins were：ethylene mole fraction 5 %- 7 %, melting temperature 140-144 ℃ ,and MFI（ 10 min）0.23-0.28 g（230 ℃,0.21 MPa）.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第2期187-190,共4页
Petrochemical Technology
关键词
无规共聚
专用料
聚丙烯
结构
表征
乙烯
丙烯
random copolymerization
special resin
polypropylene
structure
characterization
ethylene
propylene
