Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends
Functional triblock copolymers (BCPs), i.e., poly(glycidyl methacrylate/methyl methacrylate)-b-poly(lauryl methacrylate)-b-poly(glycidyl methacrylate/methyl methacrylate) triblock copolymers [(P(GMA/MMA)-b-PLMA-b-P(GMA/MMA)], were investigated as toughening modifiers for all-methacrylate polymer ble...
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| Format: | Article |
| Language: | English |
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Budapest University of Technology and Economics
2024-11-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0013062&mi=cd |
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| author | Hajime Kishi Ayana Kubo Yohei Miyaji Ayu Mochizuki Ryoko Hara Katsuya Tanaka Takeshi Kakibe Satoshi Matsuda |
| author_facet | Hajime Kishi Ayana Kubo Yohei Miyaji Ayu Mochizuki Ryoko Hara Katsuya Tanaka Takeshi Kakibe Satoshi Matsuda |
| author_sort | Hajime Kishi |
| collection | DOAJ |
| description | Functional triblock copolymers (BCPs), i.e., poly(glycidyl methacrylate/methyl methacrylate)-b-poly(lauryl methacrylate)-b-poly(glycidyl methacrylate/methyl methacrylate) triblock copolymers [(P(GMA/MMA)-b-PLMA-b-P(GMA/MMA)], were investigated as toughening modifiers for all-methacrylate polymer blends. Methyl methacrylate (MMA) was copolymerized with methacrylic acid (MAA) in the presence of the BCPs. Without MAA in the polymethacrylate matrices, the BCP blends formed micron-scale phase structures by polymerization-induced phase separation. In matrices copolymerized with MAA, self-assembled nanostructures, such as curved lamellae, worm-like cylindrical micelles, or spherical micelles were formed. The BCP blends with worm-like cylindrical nano-micelles achieved much higher fracture toughness than those with spherical nano-micelles. The toughening mechanisms were elucidated by transmission electron microscopy. Cavitation was initiated in worm-like cylindrical nano-micelles, and the aligned cavitation formed craze-like deformation with increased loads. This relieves hydrostatic tensile stress in front of the crack tip, forming a large shear yield zone within the craze-like deformation region, contributing to high toughness. |
| format | Article |
| id | doaj-art-47b7d64bd9074ed5af57e192907c30fb |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-47b7d64bd9074ed5af57e192907c30fb2025-08-20T03:56:13ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2024-11-0118111094110810.3144/expresspolymlett.2024.84Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blendsHajime KishiAyana KuboYohei MiyajiAyu MochizukiRyoko HaraKatsuya TanakaTakeshi KakibeSatoshi MatsudaFunctional triblock copolymers (BCPs), i.e., poly(glycidyl methacrylate/methyl methacrylate)-b-poly(lauryl methacrylate)-b-poly(glycidyl methacrylate/methyl methacrylate) triblock copolymers [(P(GMA/MMA)-b-PLMA-b-P(GMA/MMA)], were investigated as toughening modifiers for all-methacrylate polymer blends. Methyl methacrylate (MMA) was copolymerized with methacrylic acid (MAA) in the presence of the BCPs. Without MAA in the polymethacrylate matrices, the BCP blends formed micron-scale phase structures by polymerization-induced phase separation. In matrices copolymerized with MAA, self-assembled nanostructures, such as curved lamellae, worm-like cylindrical micelles, or spherical micelles were formed. The BCP blends with worm-like cylindrical nano-micelles achieved much higher fracture toughness than those with spherical nano-micelles. The toughening mechanisms were elucidated by transmission electron microscopy. Cavitation was initiated in worm-like cylindrical nano-micelles, and the aligned cavitation formed craze-like deformation with increased loads. This relieves hydrostatic tensile stress in front of the crack tip, forming a large shear yield zone within the craze-like deformation region, contributing to high toughness.http://www.expresspolymlett.com/letolt.php?file=EPL-0013062&mi=cd block copolymer morphology polymer alloys nanoblends compatibilization |
| spellingShingle | Hajime Kishi Ayana Kubo Yohei Miyaji Ayu Mochizuki Ryoko Hara Katsuya Tanaka Takeshi Kakibe Satoshi Matsuda Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends eXPRESS Polymer Letters block copolymer morphology polymer alloys nanoblends compatibilization |
| title | Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends |
| title_full | Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends |
| title_fullStr | Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends |
| title_full_unstemmed | Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends |
| title_short | Nanostructures and toughening mechanisms in lightly cross-linked all-methacrylate copolymer/functional block copolymer blends |
| title_sort | nanostructures and toughening mechanisms in lightly cross linked all methacrylate copolymer functional block copolymer blends |
| topic | block copolymer morphology polymer alloys nanoblends compatibilization |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0013062&mi=cd |
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