Bio-based, amorphous polyamides with tunable thermal properties

Velthoven, J.L.J. van; Gootjes, Linda; Noordover, Bart A. J.; Meuldijk, J.

doi:10.1016/j.eurpolymj.2015.01.040

Cited by 24 publications

(36 citation statements)

References 17 publications

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“…Similar peaks from ISO were partially observed by van Velthoven et al as well. 26 Peak c was noticed to overlap with peak a 0 . To conrm these assignments, the integrals of a 00 (I a 00 ), c & a 0 (I c+a 0 ) and d & e (I d+e ) were calculated.…”

Section: Synthesis and Characterization Of Iso-pdlla Diol And Iso-pusmentioning

confidence: 96%

Incorporating isosorbide as the chain extender improves mechanical properties of linear biodegradable polyurethanes as potential bone regeneration materials

Liu

Luo

et al. 2017

RSC Adv.

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Section: Synthesis and Characterization Of Iso-pdlla Diol And Iso-pusmentioning

confidence: 96%

Incorporating isosorbide as the chain extender improves mechanical properties of linear biodegradable polyurethanes as potential bone regeneration materials

Liu

Luo

et al. 2017

RSC Adv.

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“…However, odd derivatives are gaining interest due to the development of materials based on renewable resources because of concerns over long-term availability of chemicals derived from fossil resources [1,2]. Nylons 5 6 [3-6], 6 9 [7] and 13 6 [8] can be considered in this context.…”

Section: Introductionmentioning

confidence: 99%

Reversible changes induced by temperature in the spherulitic birefringence of nylon 6 9

Murase

Casas

Martínez

et al. 2015

Polymer

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Spherulitic morphologies of nylon 6 9 as an example of an even-odd nylon were studied by optical microscopy. A well-defined dependence on crystallization temperature was found. In particular, positively birefringent spherulites were characteristic for temperatures higher than 232 ºC, low birefringence spherulites developed between 232 and 225 ºC, positive ringed spherulites were found between 225 and 220 ºC, and finally negative fibrillar spherulites were formed at temperatures lower than 220 ºC. These optical properties were clearly different from those observed with even-even nylons (e.g., negative and positive birefringence for high and low temperatures, respectively), and may derive from the peculiar crystalline structures determined for even-odd nylons.Furthermore, low birefringence spherulites were characterized by a flat-on lamellar disposition and reversibility of the birefringence sign in the 80-120 ºC temperature interval (positive and negative values at high and low temperatures, respectively).Real time WAXD profiles taken during heating and cooling processes demonstrated that different crystalline structures (named I, II and III) developed depending on the temperature and crystallization procedure of samples (e.g., from solution or from the melt state). Crystalline structures were characterized by the formation of hydrogen bonds along two crystalline directions in all cases, a peculiar arrangement that may account for the development of positive and negative spherulites in a more simple way than formulated for conventional polyamides having a single hydrogen bonding direction. DSC and FTIR data also showed a complex structural behavior with structural transitions in the 80-120 ºC range, a region that corresponds to birefringence sign reversibility.

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“…Thus, crystallinity control is one of the major tasks in biopolyamide engineering. For instance, recently van Velthoven et al [57] proposed a new biopolyamide that contained moieties of isoidide-based diamine and dimerized fatty acid to obtain rigid but amorphous biopolymer. The chemical components were rationally selected to provide the planar structure of the monomer, enhancing the rigidity of the polymer backbone for increased glass transition temperature, as well as steric hinderance combined with the introduction of the odd-even effect that hampered the regular packing of polymer chains into the crystal structure.…”

Section: Synthesis Of Biopolyamides From Other Bio-based Monomersmentioning

confidence: 99%

Modern biopolyamide-based materials: synthesis and modification

2019

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The wider use of renewable feedstock in structural applications, where high mechanical performance is required, can be achieved by the application of recently developed engineering biopolymers and their further modification by micro-and nanoparticles. In this review, we present the current state of the art of biopolyamide materials for structural and functional applications. The overview includes all stages of the manufacturing-from the synthesis of building blocks, through the synthesis of polymers and its physical modification, with special emphasis on the properties of the obtained engineering biocomposites as a final product of modern polymer technology. In the first part, the synthetic routes of bio-derived counterparts of common polyamides as well as specialty polymers with functional properties arising from the complex structure of biochemicals were exemplified. The development of environmentally friendly composites and nanocomposites based on biopolyamides and natural fillers, such as plant fibers or cellulosic nanofibers, was of particular interest due to preserved sustainable character of such materials.

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Bio-based, amorphous polyamides with tunable thermal properties

Cited by 24 publications

References 17 publications

Incorporating isosorbide as the chain extender improves mechanical properties of linear biodegradable polyurethanes as potential bone regeneration materials

Incorporating isosorbide as the chain extender improves mechanical properties of linear biodegradable polyurethanes as potential bone regeneration materials

Reversible changes induced by temperature in the spherulitic birefringence of nylon 6 9

Modern biopolyamide-based materials: synthesis and modification

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