摘要 : The Lauritzen and Hoffman secondary nucleation theory was applied to linear growth rate data of syndiotactic polypropylene taken from the literature. Observation of the distinctive upward change of slope in plots of log G+U~* /2.3... 展开 The Lauritzen and Hoffman secondary nucleation theory was applied to linear growth rate data of syndiotactic polypropylene taken from the literature. Observation of the distinctive upward change of slope in plots of log G+U~* /2.303R(T_c-T_infinity) versus 1/2.303T_c(triangle openT)f suggested the regime II->III transition at the crystallization temperature of 110deg C. Based on the input parameters judged to the the most accurate, the ratios of K_(g.III)/K_(g.II) were found to range from 1.7 to 2.2. Regardless of the crystal structure, if the growth is assumed to occur on the bc plane, the lateral surface free energy, #sigma#=11.3 erg cm~(-2) and the fold surface free energy #sigma#_e=63.7+-7.1 erg cm~(-2) were found. The latter leads to the average work of chain folding of anti q=9.6+-1.1 kcal mol~(-1) is found. These values are applicable to both regimes II and III, A detailed evaluation of the effects of changes in input parameters was also carried out. 收起