Polyalkylenehydroxybenzoates (PAHBs): Biorenewable Aromatic/Aliphatic Polyesters from Lignin
✍ Scribed by Laurent Mialon; Rob Vanderhenst; Alexander G. Pemba; Stephen A. Miller
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 308 KB
- Volume
- 32
- Category
- Article
- ISSN
- 1022-1336
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Polyalkylenehydroxybenzoates (PAHBs) are a new class of thermoplastic, biorenewable aromatic/aliphatic polyester having the general formula H‐[O‐(CH~2~)~n~‐O‐4‐(3‐X, 5‐Y‐C~6~H~2~)‐CO]~z~‐OH. These are synthesized from the lignin‐derived aromatics 4‐hydroxybenzoic acid (X = Y = H), vanillic acid (X = OMe; Y = H), and syringic acid (X = Y = OMe). Alkylation of these with several chloroalkanols affords hydroxy‐acid monomers suitable for polyesterification under dynamic vacuum between 150 and 250 °C with 1 mol% Sb~2~O~3~ as catalyst. Thus, polyalkylene 4‐hydroxybenzoates, polyalkylene vanillates, and polyalkylene syringates are prepared, characterized, and subjected to thermal property comparisons by differential scanning calorimetry and thermogravimetric analysis.
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