Nanostructuration effect on the mechanical properties of PMMA toughened by a triblock acrylate copolymer using multilayer coextrusion

Multilayer coextrusion was used to obtain nanolayered films of self-assembled commercial triblock copolymer poly(methyl methacrylate-b-butyl acrylate-b-methyl methacrylate) (MAM) confined by poly (methyl methacrylate) (PMMA). A double level of organization is achieved: the obtained films are made of...

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Bibliographic Details
Published in:Polymer (Guilford) 2018-08, Vol.149, p.124-133
Main Authors: Montana, Juan-Sebastián, Roland, Sébastien, Richaud, Emmanuel, Miquelard-Garnier, Guillaume
Format: Article
Language:English
Subjects:
Block copolymers
Coextrusion
Copolymers
Directed self-assembly
Engineering Sciences
Extrusion
Fracture toughness
Impact resistance
Mechanical properties
Mechanical reinforcement
Mechanics
Mechanics of materials
Morphology
Multilayer coextrusion
Multilayers
Polymer blends
Polymethyl methacrylate
Polymethylmethacrylate
Self-assembly
Thermoplastic resins
Thermoplastics
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Summary:Multilayer coextrusion was used to obtain nanolayered films of self-assembled commercial triblock copolymer poly(methyl methacrylate-b-butyl acrylate-b-methyl methacrylate) (MAM) confined by poly (methyl methacrylate) (PMMA). A double level of organization is achieved: the obtained films are made of thousands of alternating continuous nanolayers of each component, while within the nanolayers, MAM is self-assembled with a cylindrical morphology. The mechanical properties of the resulting films were compared to those of virgin PMMA and to classically extruded PMMA/MAM blends with the same compositions where no control of the nanostructure can be achieved. It is shown that significant reinforcement can be obtained with the multilayer films compared to virgin PMMA (on the order of 20 times in terms of fracture toughness) but also compared to classical blends, by a factor from 2 to 4. Reinforcing glassy thermoplastics has been a major industrial challenge due to their usually brittle behavior in the temperature range they are used. This industrially scalable one-step process shows promises for the design of nano-laminated organic glasses with high impact resistance. [Display omitted] •Films of PMMA/PMMA-b-PBA-b-PMMA are fabricated via multilayer coextrusion.•Films have a double level of organization: ordered BCP within continuous nanolayers.•The BCP toughening role when added to PMMA is characterized at various compositions.•Nanolayered films show an improved reinforcement over classically extruded blends.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2018.06.048