069f7e0508eeb5acefe144f39384df22 theindstru_a2018v10n2p198.pdf e7ac9466725101bd4f63598c9177823b9d251ac9 theindstru_a2018v10n2p198.pdf 9955be5841d44f370f4ad1b08fdf73671966d3c4627977b9d9583f54f6f5357a theindstru_a2018v10n2p198.pdf Title: Thermally Induced Structural Transitions of Nylon 4 9 as a New Example of Even–Odd Polyamides Subject: Crystalline morphology and structure of nylon 4 9 have been studied by means of optical and transmission electron microscopies, and X-ray diffraction. Rhombic crystals were characteristic of crystallization from glycerin dilute solutions, although the final morphology was dependent on the crystallization temperature. In any case, a single electron diffraction pattern was always obtained, being characteristic a 2 mm symmetry and reflections at spacings that were indicative of a projected rectangular unit cell with hydrogen bonds established along two planar directions (i.e., the diagonals of the unit cell), as it was determined from related polyamides. Crystallization from the melt gave rise to negative birefringent spherulites with a morphology (axialitic, speckled or ringed) that was dependent on the crystallization temperature. Kinetic analysis indicated that melt crystallization took place according to two growth mechanisms (Regimes II and III), which reflect distinct secondary nucleation rates. A complex polymorphic behavior on heating and cooling processes was evidenced by real time synchrotron experiments, being determined an intermediate crystalline structure as well as the typical pseudohexagonal arrangement associated to the Brill transition. Polymorphic transitions were highly dependent on the initial crystalline structure, being enhanced the structural transition from the low temperature structure to the intermediate one when traces of the latter were initially present. Calorimetric and infrared studies supported also the detected thermal transitions of nylon 4 9. Keywords: polyamides; thermal transitions; hydrogen bonds; lamellar morphology; spherulites; synchrotron radiation; crystalline structure Author: Cristian Olmo, Maria Teresa Casas, Juan Carlos Martínez, Lourdes Franco and Jordi Puiggalí Creator: LaTeX with hyperref package Producer: pdfTeX-1.40.17 CreationDate: Tue Feb 20 15:47:20 2018 CET ModDate: Tue Feb 20 15:47:20 2018 CET Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 24 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 7355705 bytes Optimized: no PDF version: 1.5 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- ZRRRGK+URWPalladioL-Ital Type 1 Custom yes yes no 76 0 RGLTUI+URWPalladioL-Bold Type 1 Custom yes yes no 77 0 WLENKM+VnURWPalladioL-Bold Type 1 Custom yes yes no 78 0 OXBKYU+TeXGyreAdventor-Bold Type 1 Custom yes yes no 79 0 OEZYYX+URWPalladioL-Roma Type 1 Custom yes yes no 80 0 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