Polybutadiene／montmorillonite nanocomposites(NC)were prepared by in situ anionic polymerization·The effects of treating method of OMMT

the kinds of OMMT and solvent on polymerization were studied．The structure and propenies of the nanoeomposites were characterized by using XRD

TEM

HNMR

DSC

TGA and DMA-A two times change of Buli wastage was found for OMMTs treated by different methods．The NCs had wide molecular weight distribution．when OMMT-DKI was added

whereas the NCs had narrow molecular weight distribution when OMMT-DKlB and OMMT—DK4 were added．The OMMT was soluble in toluene and xylene

but didn’t dissolve in cyclohexane．XRD and TEM showed that the exfoliated nanocomposites were prepared by the in situ anionic polymerization．From the H—NMR spectra of polybutadiene(PB)and PB/OMMT nanoeomposites

micmstucture changes of PB were found．The 1

2 unit content of PB increased approximately 100％

when 6．2 wt％of OMMT was added．The results of DSC and DMA indicated that Tgand Tdc were increased approximately 10 K and 16 K

respectively

when 6．2 wt％of OMMT was added．Both the storage and loss moduli increased with OMMT addition

and tan δvalues decreased．