PAmXD,6/PP-g-MA blends. I. Compatibilization

Abstract

This work deals with the study of PAmXD,6/PP‐g‐MA blends [poly(meta‐xylylene adipamide)] and (maleic‐anhydride‐functionalized‐polypropylene) blends. Compatibilization occurs during the blending of the components in a Brabender plastograph at 265 ± 5°C and at a mixing rate of 45 rpm. Kinetic data from the literature indicate that the rate of amine/anhydride reaction is much faster than the rate of amide/anhydride reaction. This interpretation is confirmed by the use of model systems constituted of PAmXD,6 and pyromellitic dianhydride or of PP‐g‐MA and meta‐xylylene diamine. Infrared analyzes of extracted nodules of PAmXD,6/PP‐g‐MA blends also confirm the extent of the imidization and show that the length of the PAmXD,6 blocks is lower than the free PAmXD,6 one. Segregation mechanisms during the compatibilization are discussed to explain this observation. The structure of the copolymers was deduced from those results and from the previous characterizations of PP‐g‐MA and PAmXD,6. It consists in a block of PP linked with some blocks of PAmXD,6. The average number of PAmXD,6 blocks depends on the average length of the poly(maleic anhydride) functionality carried on by PP‐g‐MA. © l997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 901–915, 1997

Graft Copolymers of Poly(methyl methacrylate) and Polyamide-6: Synthesis by Reactive Blending and Characterization

“…This suggests that PA chains of lower average molecular weight graft first. For similar systems Legras and co-workers 9,33,34 reported a decrease in the molecular weight of PA due to hydrolysis. Our data do not indicate such an effect probably because of the lower molecular weight of our PA (2500 g/mol) and the less severe blending conditions (lower temperature, shorter time).…”

Effect of processing conditions on compatibility of nylon 6/polystyrene blend

“…The carboxylic stretching in maleic anhydride (MA) unit in SMA seemed to be negligible, which means the most of MA is consumed during the reaction with amine group of nylon 6. It can be easily found from the previous reports that the reaction of MA units with amine is more favorable than with amide group in nylon 6 9–11…”

“…The viscosity of nylon 6‐ g ‐SMA mixture is increased in the early mixing stage. The moisture formed by imidization between amine end group in nylon 6 and MA in SMA may cause the hydrolysis of amide group in nylon 6 9–12. This is thought to reduce the viscosity of the blend in subsequent mixing stage.…”

Compatibility effect of radiation‐grafting‐functionalized styrene–butadiene–styrene on polyamide 6/styrene–butadiene–styrene blends

“…The sketch maps of the interactions are shown in Figure 10. The amine end groups and the amide links of PA6 can interact with the anhydride or acid groups, but the amine reaction proceeds much faster than the amide reaction 28–30. Additionally, the number of amine end groups and amide links is in excess to the MAA or MAH units over the entire composition range under investigation.…”