On the synthesis of poly(ε‐caprolactam)—poly(butadiene‐co‐acrylonitrile) block copolymers for the reaction injection molding process

Abstract

The liquid rubbers Hycar ATBN and HTBN were used in the preparation of poly(ε‐caprolactam)—poly(butadiene‐co‐acrylonitrile) block copolymers intended for reaction injection molding by the anionic polymerization of ε‐caprolactam. The conversion of Hycar end groups to polymerization growth centers and the conditions of polymerization influence the crystallization, morphology, and mechanical properties of the product through its molecular structure. The contribution of individual reactions to this molecular structure is discussed.

Studies on Molecular Composites of Polyamide 6/Polyamide 66

“…Many efforts have been made to try and improve the impact resistance of PA 6. For example, reactive elastomeric compounds have been incorporated, [1][2][3][4][5][6][7][8][9][10][11] such as amine-or hydroxy-terminated elastomers (which are usually modified by diisocyanate or blocked by dicaprolactam), into e-caprolactam by in situ polymerization to form composites. Because of the poor miscibility of the elastomer and the PA 6 matrix, large rubbery domains form, leading to inferior ultimate properties of the composite.…”

Toughening and phase separation behavior of nylon 6-PEG block copolymers andin situ nylon 6-PEG blend viain situ anionic polymerization

“…To improve toughening properties of nylon 6, it is a common practice to either blend rubbery soft segments into nylon 6 matrix or introduce rubbery soft segments into the nylon 6 main chains through the activated anionic copolymeriza-tion of -caprolactam (CL) with reactive rubbery compounds such as derivatives of polyethylene glycol (PEG), polypropylene glycol (PPG), polytetramethylene oxide (PTMG), hydroxy-terminated butyronitrile rubber (HTBN), or amine-terminated butyronitrile rubber (ATBN). [1][2][3][4][5][6][7] Using amine-or hydroxy-terminated rubber modifiers, the block copolymer of nylon 6 and rubbery component can be produced with very high yield copolymers. The in situ anionic copolymerization of CL by using dicarbamoyl dicaprolactam as an activator requires no prior synthesis of macroactivator of rubbery component.…”

Poly(ϵ‐caprolactam)–poly(butadiene‐co‐acrylonitrile) block copolymers. I. Synthesis, characterization, mechanical properties, and morphology

“…in other research": The (m) polyamide-polybutadiene copolymers, the (A) Nylon 6-P P G block copolymers with various P P G contents( 18,20,22,24, 26, 30 wt % PPG) , the (V) Nylon 6-EPDM blends with various rubber contents(2, 5,8,10,20 wt % ) , average rubber particle size 0.3 pm.…”