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Synthesis of regioselective starch‐based macroinitiators at molecular level
- Wang, Leli, Qu, Lin, Wu, Ying, Men, Yongjun, Liu, Zhengping
- Die Stärke = 2017 v.69 no.11-12
- crystal structure, differential scanning calorimetry, hydrogen bonding, nuclear magnetic resonance spectroscopy, regioselectivity, solubility, thermal properties, thermogravimetry
- Regioselective starch‐based macroinitiators, such as 2,3,6‐O‐macroinitiator (2,3,6‐O‐starch‐2‐bromoisobutyrate), 2‐O‐macroinitiator (2‐O‐starch chloroacetate), 6‐O‐macroinitiator (6‐O‐starch‐3‐chloropivalate), 3‐O‐macroinitiator (3‐O‐starch‐2‐bromoisobutyrate), 3,6‐O‐macroinitiator (3,6‐O‐starch‐2‐bromoisobutyrate), and 2,3‐O‐macroinitiator (2,3‐O‐starch‐2‐bromoisobutyrate), were successfully synthesized at the molecular level. ¹³C NMR spectra were employed to certify the structures of these regioselective macroinitiators. Their thermal behaviors characterized by TGA and DSC indicated the destruction of hydrogen bonds and the crystalline structure during the dissolution and reaction processes. The solubility of macroinitiators depended on their degree of substitution (DS).