Interfacial region of poly(<scp><i>n</i>‐butyl</scp> acrylate)/silicon oxide

Matsuura, Kazuhiro; Kuboyama, Keiichi; Ougizawa, Toshiaki

doi:10.1002/app.50268

Cited by 2 publications

(1 citation statement)

References 34 publications

(62 reference statements)

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“…Moreover, the most significant difference between pBM and A‐LNP‐pBM in the XRD profile is that only the ordered packing of side and main chains of poly(butyl acrylate) (pBA) were delineated for A‐LNP‐1.5‐pBM film at 2θ = 7° and 19°, respectively. [ 52 ] It should be noted here that the XRD pattern of the A‐LNP‐2.5‐pBM and A‐LNP‐4.0‐pBM latex films shows a distinct and sharp diffraction peak at 2θ = 2.5°, which indicates that the core–shell emulsion polymerization using A‐LNPs as a structural template induced the formation of periodic mesostructures, typically confirming the presence of long‐range hexagonal order with a 3.5 nm domain spacing. [ 53 ] Subsequently, the latex films were quantitatively evaluated in terms of the interpenetration degree of near‐surface polymer chains on latex colloids using SAXS analysis.…”

Section: Resultsmentioning

confidence: 99%

Template‐Directed Polymerization of Binary Acrylate Monomers on Surface‐Activated Lignin Nanoparticles in Toughening of Bio‐Latex Films

Wang

Rosqvist

et al. 2023

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advanced functional templates, such as porous supraparticles and complex crystal superstructures, due to their facile surface functionalization and tunable colloidal assembly. [1][2][3][4][5][6] Films fabricated from latex colloids with a unique core-shell morphology is a novel class of nanoparticlepolymer composites that synergistically integrate the versatility of nanoparticles (core) with the processability and diversity of the corona polymers (shell). [5,7] Two techniques, that is, seeded free-radical emulsion polymerization and controlled radical emulsion polymerization of amphiphilic block copolymers (commonly a macro chain-transfer agent), have proven effective in devising multifunctional coreshell latex colloids. [7][8][9] In the above-mentioned techniques, the seed of the latex colloid or the hydrophobic core that is derived from the polymerization-induced self-assembly in aqueous dispersion functions as an interfacial modulator to direct hydrophobic polymer growth on the core surface or in the core, respectively. [10,11] Compared with controlled radical emulsion polymerization, seeded emulsion polymerization offers more possibilities to vary the constituents of the core (e.g., polyesters, polyolefins, polyvinyl acetate, acrylics, polysaccharides, silica) and distinct shell geometries, such as raspberry-and dumbbell-like features, Fabricating bio-latex colloids with core-shell nanostructure is an effective method for obtaining films with enhanced mechanical characteristics. Nanosized lignin is rising as a class of sustainable nanomaterials that can be incorporated into latex colloids. Fundamental knowledge of the correlation between surface chemistry of lignin nanoparticles (LNPs) and integration efficiency in latex colloids and from it thermally processed latex films are scarce. Here, an approach to integrate self-assembled nanospheres of allylated lignin as the surface-activated cores in a seeded free-radical emulsion copolymerization of butyl acrylate and methyl methacrylate is proposed. The interfacial-modulating function on allylated LNPs regulates the emulsion polymerization and it successfully produces a multi-energy dissipative latex film structure containing a lignin-dominated core (16% dry weight basis). At an optimized allyl-terminated surface functionality of 1.04 mmol g −1 , the LNPs-integrated latex film exhibits extremely high toughness value above 57.7 MJ m −3 . With multiple morphological and microstructural characterizations, the well-ordered packing of latex colloids under the nanoconfinement of LNPs in the latex films is revealed. It is concluded that the surface chemistry metrics of colloidal cores in terms of the abundance of polymerization-modulating anchors and their accessibility have a delicate control over the structural evolution of core-shell latex colloids.

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Section: Resultsmentioning

confidence: 99%