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The ring‐opening polymerization of L‐lactide with stannous octoate was investigated in the presence of pentaerythritol. By this way it was possible to prepare higher molecular weight star‐shaped poly( L ‐lactide)s compared with the linear ones obtained by stannous octoate only. The weight‐average molecular weights of linear and star poly( L ‐lactide)s were measured by light scattering analysis from hexafluoro‐2‐propanol solution, and the respective Mark‐Houwink equations were derived. The second virial coefficient and the intrinsic viscosity of the star polymers were lower than those of the linear ones, which confirms the star‐shaped architecture.
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Kim et al. (1993) studied this question.
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