The aliphatic counterpart of PET, PPT and PBT aromatic polyesters: effect of the molecular structure on thermo-mechanical properties

Morgane Albanese; Justine Boyenval; Paola Marchese; Simone Sullalti; Annamaria Celli; Morgane Albanese; Justine Boyenval; Paola Marchese; Simone Sullalti; Annamaria Celli

doi:10.3934/molsci.2016.1.32

AIMS Molecular Science

2016, Volume 3, Issue 1: 32-51. doi: 10.3934/molsci.2016.1.32

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Research article Special Issues

The aliphatic counterpart of PET, PPT and PBT aromatic polyesters: effect of the molecular structure on thermo-mechanical properties

Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Via Terracini 28, BO 40131, Italy

Received: 30 October 2015 Accepted: 01 February 2016 Published: 16 February 2016

The aliphatic counterparts of the most used aromatic polyesters (PET, PPT, and PBT) have been synthesized by a two-stage polycondensation process, starting from dimethyl 1,4-cyclohexane dicarboxylate and different diols. The fully aliphatic polyesters are characterized by two cis/trans isomeric ratios (50 and 90 mol%) of the 1,4-cycloaliphatic rings. According to the cis/trans content, the properties of the materials notably change. Indeed, polymers rich in trans isomer are semicrystalline, whereas polymers with low trans content are fully amorphous, due to the presence of kinks along the chain. Trans isomer is characterized by higher rigidity than the cis one and the corresponding polymers have high glass transition temperatures. Moreover, the length of the methylene sequences in the diol has a notable influence on the final thermal and mechanical properties. Therefore, tunable properties can be easily obtained. This characteristic, in association with good mechanical performances, potential sustainability of the monomers and biodegradability, makes these aliphatic polyesters an interesting class of polyesters for some specific applications.
- Polyesters,
- 1,4-cyclohexylene ring,
- cis/trans ratio,
- thermal properties,
- crystallization kinetics
Citation: Morgane Albanese, Justine Boyenval, Paola Marchese, Simone Sullalti, Annamaria Celli. The aliphatic counterpart of PET, PPT and PBT aromatic polyesters: effect of the molecular structure on thermo-mechanical properties[J]. AIMS Molecular Science, 2016, 3(1): 32-51. doi: 10.3934/molsci.2016.1.32

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Abstract

The aliphatic counterparts of the most used aromatic polyesters (PET, PPT, and PBT) have been synthesized by a two-stage polycondensation process, starting from dimethyl 1,4-cyclohexane dicarboxylate and different diols. The fully aliphatic polyesters are characterized by two cis/trans isomeric ratios (50 and 90 mol%) of the 1,4-cycloaliphatic rings. According to the cis/trans content, the properties of the materials notably change. Indeed, polymers rich in trans isomer are semicrystalline, whereas polymers with low trans content are fully amorphous, due to the presence of kinks along the chain. Trans isomer is characterized by higher rigidity than the cis one and the corresponding polymers have high glass transition temperatures. Moreover, the length of the methylene sequences in the diol has a notable influence on the final thermal and mechanical properties. Therefore, tunable properties can be easily obtained. This characteristic, in association with good mechanical performances, potential sustainability of the monomers and biodegradability, makes these aliphatic polyesters an interesting class of polyesters for some specific applications.

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