Thermo-mechanical properties of Polyamide 6 chemically modified by chain extension with Polyamide/Polycarbonate blend

Buccella, Mauro; Dorigato, Andrea; Pasqualini, E.; Caldara, Mauro; Fambri, Luca

doi:10.1007/s10965-012-9935-0

Cited by 30 publications

(29 citation statements)

References 16 publications

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“…However, it is not possible to detect a clear trend of T g with the relative CB/NF amount. A similar trend has been previously observed and reported by our group for various nanofilled thermosets , and it can be explained considering that the crosslinking process can be partially hindered at elevated filler concentrations. As already reported in our previous paper on similar epoxy systems , the observed T g trend could be due to the occurrence of two concurrent phenomena: as the filler content increases the chain blocking mechanisms is more effective and leads to a slight T g increase, while, at the same time, polymer‐filler chemical interactions and the viscosity increase reduces the crosslinking degree of the matrix, thus reducing the T g of the material.…”

Section: Resultssupporting

confidence: 91%

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Shape memory epoxy nanocomposites with carbonaceous fillers and in‐situ generated silver nanoparticles

Dorigato

Pegoretti

2018

Polymer Engineering & Sci

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Aim of this work is to develop a novel epoxy based nanocomposite and to analyse its shape memory behavior. In particular, silver nanoparticles are in‐situ generated within an epoxy resin subsequently filled with both carbon black (CB) and carbon nanofibers (NFs) at different ratios and at a total amount of 4 wt%. Differential scanning calorimetry shows how the introduction of both CB and NF induces a slight decrease of the glass transition temperature (Tg) of the samples. The Tg drop due to nanofiller addition determines a decrease of both flexural modulus and stress at yield with respect to the neat resin, especially at elevated CB concentrations, while the presence of Ag nanoparticles plays a positive effect on the flexural properties. The best mechanical properties can be detected at a CF/NF ratio of 50%, coupled with a noticeable decrease of the electrical resistivity down to 102 Ω·cm and an interesting heating capability through Joule effect. The electro‐mechanical shape‐memory characterization under bending configuration demonstrates how it is possible to obtain an almost complete shape recovery after 60 s under an applied voltage of 220 V. POLYM. ENG. SCI., 59:694–703, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 91%

“…e). As already observed in our previous paper , the aggregation tendency in CB filled nanocomposites increases with the nanofiller loading, because the mean interparticle distance diminishes and the probability of aggregation is therefore enhanced . 4NF nanocomposite exhibits a more complex microstructure.…”

Section: Resultssupporting

confidence: 79%

Shape memory epoxy nanocomposites with carbonaceous fillers and in‐situ generated silver nanoparticles

Dorigato

Pegoretti

2018

Polymer Engineering & Sci

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“…Thus, many chemical treatment approaches such as chain extension have been taken to modify PA6. Buccella et al . studied the effects of 1,1′‐carbonyl‐bis‐caprolactam and 1,3‐phenylene bis(2‐oxazoline‐2) individually, as well as in combination, on the dynamic rheological properties behavior and the thermomechanical behavior of the resultant PA6 materials.…”

Section: Introductionmentioning

confidence: 99%

Determination of modified polyamide 6's foaming windows by bubble growth simulations based on rheological measurements

Chen

Liu

et al. 2019

J of Applied Polymer Sci

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Reactive extrusion was used to modify virgin polyamides 6 (v-PA6) and to prepare chain extended PA6 (CE-PA6) and longchain branched PA6 (LCB-PA6) for the melt foaming process. This was done using a twin-screw extruder and the following modifiers: a chain extender ADR-4368 and a branching agent maleic anhydride grafted polypropylene. A reaction mechanism was proposed to explain the chain extension and long-chain branching reactions and was verified by the Fourier transform infrared spectroscopy data. The analysis of the gel permeation chromatography data showed that LCB-PA6 presented a strong increase in the molecular weight and in the dispersity index. Moreover, the rheological properties of the v-PA6 and modified PA6 resins were characterized by a dynamic shear test. The LCB-PA6 compared with CE-PA6 showed much higher shear viscosity and longer characteristic relaxation times, indicating the presence of an LCB structure. A uniaxial elongation test showed that the LCB-PA6 had the highest melt viscosity and melt strength as well as most obvious strain-hardening behavior. A high-pressure differential scanning calorimeter under compressed CO 2 was used to investigate the PA6's crystallization properties so as to analyze its minimum temperature of foaming windows. The melt foamability of the CE-PA6 and the LCB-PA6 was verified by batch melt foaming experiments with CO 2 as the blowing agent and maximum temperature of foaming windows was also quantitatively determined by numerical simulation of bubble growth based on the rheological measurements. The results showed that the LCB-PA6 foams had a smaller cell diameter, a larger cell density, a greater expansion ratio, and wider foaming temperature window than the CE-PA6.

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“…Following a different approach, one can add the use of caprolactam dimer, i.e. 1,1 0 -carbonyl-bis-caprolactam, as chain extender, improving in particular the strain at break of PA6 [29,30]. Recently, Mathias and co-workers proposed the synthesis of vinyl monomers from a-amino-ε-caprolactam for the preparation of new vinyl polymers and supramolecular assemblies [31].…”

Section: Introductionmentioning

confidence: 99%

Controlled synthesis of crosslinked polyamide 6 using a bis-monomer derived from cyclized lysine

Bouchékif

Tunc

Coz

et al. 2014

Polymer

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Thermo-mechanical properties of Polyamide 6 chemically modified by chain extension with Polyamide/Polycarbonate blend

Cited by 30 publications

References 16 publications

Shape memory epoxy nanocomposites with carbonaceous fillers and in‐situ generated silver nanoparticles

Shape memory epoxy nanocomposites with carbonaceous fillers and in‐situ generated silver nanoparticles

Determination of modified polyamide 6's foaming windows by bubble growth simulations based on rheological measurements

Controlled synthesis of crosslinked polyamide 6 using a bis-monomer derived from cyclized lysine

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