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Characterization
We performed several experiments in order to characterize the mechanical, chemical and thermal properties of our polymers. We also checked if they verify the initial specifications that the clamp must meet.
Our conlusions ...
After analysis of the nGen_flex and Nylon_230 samples by means of the below experimental techniques reached the following conclusions :
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For nGen_flex we concluded that it was able to withstand high temperatures (~180°C) although the chemical compound(s) providing this outstanding thermal property could not be identified by H-NMR and FTIR. Moreover, the rubber-like properties due to its semi-crystalline nature, observed performing a DMA analysis, make this latter ideal to be used as the clamp surface, as it shows a high friction coefficient providing a good adhesion
Experiments
A DSC has been made in order to see the different thermal transitions that the samples can undergo.
The rheometry help us to define the flow properties of our polymers and hence if the material can be printed easily.
We performed a FTIR to determine the composition of our samples.
The optical microscopy allows us to see the morphology of the polymers and to see how they interact with one another.
As the clamp can be used in chemistry research, it is important to evaluate how the material behaves in different environments.
The DMA permits us to measure the mechanical properties as function of temperature and to quantify how the clamp behaves at the maximum operating temperature.
Putting the polymers in an oven is probably the easiest way to see if they can withstand the required maximum operating temperature.
The H-NMR spectroscopy allow us to know more in details the proton environment of each carbon in the polymer structure.
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Nylon_230 showed a high chemical resistance to the most common organic samples as well as a good temperature resistance although after long heat exposure, the material turned to black, supposingly due to degradation. Physically, spherulites were found inside the material by optical microscopy. Moreover, DMA showed to partially (~30%) keep its mechanical properties even at high temperature (120°C). However, a weak adhesion exists between nGen_flex and Nylon hence individual printing was performed.