| Title |
Influence of Epoxy Functional Chain-Extenders on the Thermal and Rheological Properties of Bio-Based Polyamide 10.10 |
| ID_Doc |
15507 |
| Authors |
Erdmann, R; Rennert, M; Meins, T |
| Title |
Influence of Epoxy Functional Chain-Extenders on the Thermal and Rheological Properties of Bio-Based Polyamide 10.10 |
| Year |
2023 |
| Published |
Polymers, 15, 17 |
| DOI |
10.3390/polym15173571 |
| Abstract |
Bio-based polyamide 10.10 (PA 10.10) has excellent properties compared to other bio-based polymers such as polylactic acid (PLA) or polyhydroxyalkanoates (PHAs) and is therefore used in more technical applications where higher strength is required. For foam and filament extrusion, a good balance between strength and stiffness of the polymer is needed. Therefore, two commercial chain-extenders (Joncryl (R) ADR types) with different epoxy functionalities are used to modify the melt properties of PA 10.10. The chain-extenders are used in a concentration range up to 1.25 wt.%. The range of glass transition temperature widens with increasing Joncryl (R) content, and the apparent activation energy shows a maximum at a concentration of 0.5 wt.%. Furthermore, the melting temperatures are constant and the crystallinity decreases with increasing chain-extender content due to the formation of branches. During the second heating run, a bimodal melting peak appeared, consisting of a-triclinic and pseudo ?-hexagonal crystals. The weight average molar masses (M-w) measured by gel permeation chromatography (GPC) increased linearly with increasing ADR 4400 content. In contrast, the compounds containing ADR 4468 show a maximum at 0.5 wt.% and it begins to decrease thereafter. The rheological data show an increase in viscosity with increasing chain-extender content due to branch formation. ATR spectra of the compounds show a decrease at the wavelength of the primary (3301 cm(-1)) and secondary (1634 cm(-1)) (-NH stretching in PA 10.10) amine, indicating that chain-extension, e.g., branching, takes place during compounding. |
| Author Keywords |
polyamide 10.10; chain-extender; Joncryl(& REG;); epoxy functionalization; reactive modification; branched polymer |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001064124900001 |
| WoS Category |
Polymer Science |
| Research Area |
Polymer Science |
| PDF |
https://www.mdpi.com/2073-4360/15/17/3571/pdf?version=1693289633
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