Table 4 Effect of change between catalyst and coupling agent.

From: Synthesis, characterization of poly l(+) lactic acid and its application in sustained release of isosorbide dinitrate

Reaction No.

Catalyst

Coupling agent

The ratio between the catalyst and coupling agent

1

ZnO

ZnCl2

2:2

2

ZnCl2

ZnO

2:2

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