title: [Time-resolved FTIR study of amorphous process of nylon 6 with calcium chloride].
abstract: The influence of calcium chloride on the crystallinity of nylon 6 was studied by means of time-resolved FTIR, WADX and DSC. The results show that the crystallinity of nylon 6 decreased with the increase of CaCl2, and finally nylon 6 changed from crystal phase to amorphous phase. Because hydrogen bond is the main reason that nylon has three-dimensional ordered structure and forms crystalline phase, we further studied the changes of wave number of NH, amide I and amide II related to hydrogen bond in CaCl2/PA6 complexes by time-resolved FTIR. These studies indicate that in the chloroethanol solution of nylon 6 and calcium chloride, complex bonds between calcium cation and oxygen atom of carbonyl group gradually form, and calcium cations are inserted into the molecular chains of nylon 6, which weaken the hydrogen bonds between the molecular chains of nylon 6 and damage the three-dimensional ordered structure of nylon 6, so the crystallinity of nylon 6 decreases and nylon 6 changes from crystalline to amorphous phase.
authors.affiliation: The State Key Laboratory of Polymer Material Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Cheng
authors.forename: Qi-jia
authors.initials: QJ
authors.lastname: He
authors.forename: Ai-min
authors.initials: AM
authors.lastname: Zhang
mesh_terms: D002122:Calcium Chloride / Q000494:pharmacology*; D002209:Caprolactam / Q000031:analogs & derivatives* / Q000737:chemistry; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D006860:Hydrogen Bonding / Q000187:drug effects*; D008958:Models, Molecular; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D011108:Polymers; C009916:nylon 6; D002209:Caprolactam; D002122:Calcium Chloride