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The resulting heterogeneous reaction mixture, which was lumpy and hardened, was neutralized by addition of 15% aqueous tartaric acid solution. The polymer was filtered and a small portion was ground thoroughly. The ground material was extracted with 2-propanol for 24 hrs in a Soxhlet extractor and dried to afford a pale brown solid which was not soluble to any extent in distilled water.

1. filtrationThe polymer was filtered
2. extractionThe ground material was extracted with 2-propanol for 24 hrs in a Soxhlet extractor
3. customdried
4. customto afford a pale brown solid which