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A novel reactive extrusion process for compatibilizing immiscible polymer blends

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Volume
42
Issue
21
Identifiers
DOI: 10.1016/s0032-3861(01)00317-2
Keywords
  • Reactive Extrusion
  • Compatibilization
  • Polyamide 6

Abstract

Abstract A novel reactive extrusion process was developed to obtain compatibilized A/B immiscible polymer blends. It consisted of polymerizing a monomer of polymer A in the presence of polymer B. A fraction of polymer B chains bore initiating sites either at the chain end(s) or along the chain backbones, from which polymer A chains could grow. In the process, polymer A and a graft or block copolymer of A and B were formed simultaneously leading to in situ polymerized and in situ compatibilized A/B polymer blends. This paper shows the feasibility of this novel process in a batch mixer using polypropylene (PP) and polyamide 6 (PA 6) blends as an example. Specifically, ε-caprolactam (ε-CL) was polymerized anionically in the presence of PP. A fraction of the PP chains bore 3-isopropenyl-α,α-dimethylbenzene isocyanate (TMI) which acted as growing centers to initiate PA 6 chain growth from the PP chains and to form a graft copolymer of PP and PA 6.

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