Issue 4, 2016

Synthesis and characterization of bio-based alkyl terminal hyperbranched polyglycerols: a detailed study of their plasticization effect and migration resistance

Abstract

We develop a plasticizer composed of alkyl terminal hyperbranched polyglycerol (alkyl-HPG) for the production of non-toxic, phthalate-free flexible poly(vinyl chloride) (PVC). The synthesized alkyl-HPGs are transparent liquids at room temperature and exhibit considerably lower volatility than di(2-ethylhexyl) phthalate (DEHP). The miscibility analyses reveal that the alkyl termination and the hyperbranched architecture of alkyl-HPG are the key factors for improving its miscibility with PVC, and butyl-terminated HPGs (HPG-C4s) are fairly miscible with PVC irrespective of their degree of polymerization (DP). The obtained PVC/HPG-C4 films exhibit similar flexibility and stretchability with the corresponding properties of PVC/DEHP films. In particular, PVC/HPG3-C4, the blend with the smallest DP, has excellent plasticization efficiency and low apparent activation energy (Ea) for α relaxation comparable to those of PVC/DEHP owing to its high concentration of chain ends. The transparency and thermal stability of PVC/HPG-C4 are rather better than those of PVC/DEHP, and HPG-C4s are biologically safe without acute toxicity. Moreover, PVC/HPG-C4 shows an extremely small degree of migration in leaching tests, more than 80% lower than that of PVC/DEHP.

Graphical abstract: Synthesis and characterization of bio-based alkyl terminal hyperbranched polyglycerols: a detailed study of their plasticization effect and migration resistance

Supplementary files

Article information

Article type
Paper
Submitted
07 Oct 2015
Accepted
30 Nov 2015
First published
30 Nov 2015

Green Chem., 2016,18, 999-1009

Synthesis and characterization of bio-based alkyl terminal hyperbranched polyglycerols: a detailed study of their plasticization effect and migration resistance

K. W. Lee, J. W. Chung and S. Kwak, Green Chem., 2016, 18, 999 DOI: 10.1039/C5GC02402A

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