FENG Lin-xian, FAN Zhi-qiang, XU Xiou-zhu, BO Yi-min, YANG Shi-lin. EVALUATION OF MARK-HOUWINK CONSTANTS AND STUDY OF THE MOLECULAR WEIGHT DISTRIBUTION OF POLY (1-OCTENE)[J]. Acta Polymerica Sinica, 1989,(3):349-354.
FENG Lin-xian, FAN Zhi-qiang, XU Xiou-zhu, BO Yi-min, YANG Shi-lin. EVALUATION OF MARK-HOUWINK CONSTANTS AND STUDY OF THE MOLECULAR WEIGHT DISTRIBUTION OF POLY (1-OCTENE)[J]. Acta Polymerica Sinica, 1989,(3):349-354.DOI:
The Mark-Houwink constants of poly (1-octene) in THF at 25℃ were evaluated from GPC and [η] of broad distribution samples. Two methods were used: calculation of K and a from the method developed by weiss and from the linear relation between in In[η] and InMx made by Goldwasser. More reliable results were obtained with the latter method. Determination of the molecular weight was made with the light scattering method
which gave Mw value close to that obtained from GPC. Then the Mark-Houwink equation for poly(1-octene) is [n]25℃THF×10-4M0.625. The effects of polymerization conditions on molecular weight distribution were studied with GPC. When AlEt3 was used as cocatalyst
the distribution was bi-modal. The change of alkyl aluminiums caused greater effect on the distrbutions than the cha-nge of TiCl3 strucure.