| 摘要 |
Process for enhancing the melt strength of polypropylene by heat treating said polypropylene at a temperature between 150oC and 300oC in the presence of 0.3-3wt pcnt , based on the weight of the polypropylene,of a dialkyl peroxydicarbonate having alkyl groups with 12-20 carbon atoms, wherein a hydrophilic silica with a silanol group concentration of at least 1.0 mmol Si-OH groups/g, as measured by LiAlH4 titration, is added to said polypropylene before, during, or after said heat treatment, in a mole ratio Si-OH/dialkyl peroxydicarbonate of more than 0.5. |
