Toughening effect and mechanism of polyamide 12 and modified montmorillonite in polybenzoxazine resin
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Junping Zhou
,
Xiaojia He
Abstract
The mechanical properties of polybenzoxazine (PBa) resins were improved by adding polyamide 12 (PA12) and modified montmorillonite (OMMT) as additives. The mechanical properties and thermal stability of PBa and resulting PBa composites were investigated using an Instron universal material testing instrument and dynamic mechanical analysis. The morphologies of the fracture surfaces were characterized by scanning electron microscopy. The results of morphological studies showed that PBa/PA12/OMMT composites exhibit significantly improved mechanical properties and thermal stability compared with that of the pristine PBa. When the OMMT content increased to 1 wt%, the fracture toughness (1.36 MPa·m1/2) and the fracture energy (GIC, 315.76 J·m−2) of PBa/PA12/OMMT-1 composites increased by 67.9% and 181.4%, respectively, compared with those of the pristine PBa. The thermal stability properties demonstrated that the storage modulus and glass transition temperature (Tg) of PBa/PA12/OMMT composites gradually increased with the addition of OMMT particles. The scanning electron microscopy results indicated that PBa/PA12/OMMT composites possess a toughening mechanism of crack deflection, with a large bulk of voids and debonding induced by PA12 and OMMT clay particles. Moreover, the OMMT might provide microvoid nucleating sites at its surface to release constrains for shear yielding.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51703191
Funding source: Southwest Petroleum University
Award Identifier / Grant number: X151517KCL44
Funding statement: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was financially supported by the National Natural Science Foundation (Funder Id: 10.13039/501100001809, 51703191) of China, the Scientific Research Innovation Team of University in Sichuan Provence (16TD0009), the International Cooperation Research Program of Sichuan Province (2017HH0082), and the Foundation for Key Lab of Oil and Gas Material of Southwest Petroleum University (X151517KCL44), P. R. China.
Conflict of interest statement: The author(s) declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Material properties
- Steady shear and dynamic strain thickening of halloysite nanotubes and fumed silica shear thickening composite
- Diffusivity of solvents in semi-crystalline polyethylene using the Vrentas-Duda free-volume theory
- Toughening effect and mechanism of polyamide 12 and modified montmorillonite in polybenzoxazine resin
- The effects of cross-linked/uncross-linked electrospun fibrinogen/polycaprolactone nanofibers on the proliferation of normal human epidermal keratinocytes
- Frequency independent AC electrical conductivity and dielectric properties of polyaniline-based conductive thermosetting composite
- Preparation and assembly
- Study on the preparation and drug release property of soybean selenoprotein/carboxymethyl chitosan composite hydrogel
- Engineering and processing
- Interaction of nanofillers in injection-molded graphene/carbon nanotube reinforced PA66 hybrid nanocomposites
- Prediction of the yellowing of styrene-stat-acrylonitrile and acrylonitrile-butadiene-styrene during processing in an internal mixer
- Milling process optimization for the best surface coat adhesion of the rigid polyurethane foam
- A numerical analysis of calendering of Oldroyd 4-constant fluid
Artikel in diesem Heft
- Frontmatter
- Material properties
- Steady shear and dynamic strain thickening of halloysite nanotubes and fumed silica shear thickening composite
- Diffusivity of solvents in semi-crystalline polyethylene using the Vrentas-Duda free-volume theory
- Toughening effect and mechanism of polyamide 12 and modified montmorillonite in polybenzoxazine resin
- The effects of cross-linked/uncross-linked electrospun fibrinogen/polycaprolactone nanofibers on the proliferation of normal human epidermal keratinocytes
- Frequency independent AC electrical conductivity and dielectric properties of polyaniline-based conductive thermosetting composite
- Preparation and assembly
- Study on the preparation and drug release property of soybean selenoprotein/carboxymethyl chitosan composite hydrogel
- Engineering and processing
- Interaction of nanofillers in injection-molded graphene/carbon nanotube reinforced PA66 hybrid nanocomposites
- Prediction of the yellowing of styrene-stat-acrylonitrile and acrylonitrile-butadiene-styrene during processing in an internal mixer
- Milling process optimization for the best surface coat adhesion of the rigid polyurethane foam
- A numerical analysis of calendering of Oldroyd 4-constant fluid
