Modification of Nylon 6 Structure via Nucleation

Nucleated crystallization;non-stoichiometric Inclusion Compounds;Cyclodextrin;Nylon

Mohan, Anushree ; Bruce Novak, Committee Member,Jan Genzer, Committee Member,Alan E. Tonelli, Committee Chair,Richard Kotek, Committee Co-Chair,Mohan, Anushree ; Bruce Novak ; Committee Member ; Jan Genzer ; Committee Member ; Alan E. Tonelli ; Committee Chair ; Richard Kotek ; Committee Co-Chair

University:North Carolina State University

关键词: Nucleated crystallization;    non-stoichiometric Inclusion Compounds;    Cyclodextrin;    Nylon;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/3101/etd.pdf?sequence=1&isAllowed=y

美国|英语

来源: null

【 摘 要 】

For nearly two decades inclusion compounds (ICs) have been formed by threading polymer chains into the cyclic starches, cyclodextrins (CDs). Non-covalently bonded crystalline ICs have been formed by threading CDs, onto guest nylon-6 (N6) chains. When excess N6 is employed, non-stoichiometric (n-s)-N6-CD-ICs with partially uncovered and dangling N6 chains result. We have been studying the constrained crystallization of the N6 chains dangling from (n-s)-N6-CD-ICs in comparison with bulk N6 samples, as a function of N6 molecular weights, lengths of uncovered N6 chains, and the CD host used. While the crystalline CD lattice is stable to ~ 300° C, the uncovered and dangling, yet constrained, N6 chains may crystallize below, or be molten above ~225° C.In the IC channels formed with host α- and γ-CDs containing 6 and 8 glucose units, respectively, single and pairs of side-by-side N6 chains can be threaded and included. In the α-CD-ICs the ~ 0.5nm channels are separated by ~ 1.4nm, while in γ-CD-ICs the ~ 1nm channels are ~ 1.7 nm apart, with each γ-CD channel including two N6 chains. The constrained dangling chains in the dense (n-s)-N6-CD-IC brushes crystallize faster and to a greater extent than those in bulk N6 melts, and this behavior is enhanced as the molecular weights/chain lengths of N6 are increased. Furthermore, when added at low concentrations (n-s)-N6-CD-ICs serve as effective nucleating agents for the bulk crystallization of N6 from the melt. Because of the biodegradable/bioabsorbable nature of CDs, (n-s)-polymer-CD-ICs can provide environmentally favorable, non-toxic nucleants for enhancing the melt crystallization of polymers and improving their properties.