Remarkable effects of silicone rubber on flame retardant property and mechanical properties of crosslinked high‐density polyethylene/bio‐based magnesium phosphate flame retardant (<scp>MHPA</scp>) composite

Feng, Xi; Wang, Zhengyu; Ma, Hongli; Dang, Bo; Li, Jianxi

doi:10.1002/vnl.22005

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Moreover, the superhydrophilicity of LDHs results in agglomeration and poor distribution in polymer matrices, reducing the mechanical properties of the materials. [14][15][16] In the past decade, various approaches have been implemented to improve the dispersion of LDHs, including surface chemical modification, interlayer intercalation, and exfoliation of LDHs. Among these methods, surface decoration or modification with organic anions can significantly improve the dispersion of LDH nanoparticles within polymer matrices.…”

Section: Introductionmentioning

confidence: 99%

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Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

Li,

Lin,

Liu

et al. 2023

Polymer Composites

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The incorporation of two‐dimensional layered metal hydroxides (LDHs) into nonpolar silicone rubber (SR) is not yet universal, mainly because of their originally hydrophilic surface and limited interlamellar galleries that make nanoparticle dispersion and intercalation of polymer segments more difficult. In this work, we develop a modified Ca‐Mg‐Al LDH form by conjugating the ternary Ca‐Mg‐Al LDH with silsesquioxane (SQ) surfactants containing benzoic acid moieties and polyethylene glycol chains via an in‐situ intercalation process. The bulky anions conjugation to the hydroxide layers dictated both the surface hydrophobicity and interlayer spacing of the modified Ca‐Mg‐Al LDH, enabling strong inter‐constituent interactions within the nanocomposites as well as extensive polymer penetration after incorporation into the SR matrix. The SR/modified LDH nanocomposites show excellent thermal stability and satisfactory mechanical properties due to the homogeneous dispersion and good compatibility of modified Ca‐Mg‐Al LDH. Moreover, we have observed that the shear‐induced orientation of the nano‐layered particles upon application of stress imparts a more notably decreased SR/LDH‐SQ‐40 gas transmission rate (reduced by 55% with respect to that in the unstretched composite films). This result also corroborates the better interfacial bonding and highly efficient load transfer between silsesquioxane‐modified LDH and polymer in melt extrusion mixing of such composites.Highlights Modified Ca‐Mg‐Al LDH with increased layer spacing and reduced hydrophilicity. Modifier enhanced the interfacial adhesion between Ca‐Mg‐Al LDH and SR matrix. SR/modified LDH showed excellent thermal stability and mechanical properties. Orientation and exfoliation enhanced gas barrier properties of SR/modified LDH.

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Section: Introductionmentioning

confidence: 99%

“…However, LDHs are difficult to delaminate because of the high charge density of the layers and anion content. Moreover, the superhydrophilicity of LDHs results in agglomeration and poor distribution in polymer matrices, reducing the mechanical properties of the materials 14–16 …”

Section: Introductionmentioning

confidence: 99%

Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

Li,

Lin,

Liu

et al. 2023

Polymer Composites

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Rational Utilization of Intermolecular Interactions: Enhancing the Mechanical Properties of Amorphous Glassy Polymer through Flexible Backbones

Liu,

Xiong,

et al. 2024

Macromolecules

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Intermolecular van der Waals (vdW) forces are ubiquitous and essential in polymers. However, their coupling with chemical rigidity makes it difficult to isolate their effects in polymers, resulting in a lack of understanding of how vdW influences macroscopic performance. Here, we exploited single and double bonds to modulate the rigidity of the molecular backbone without significantly altering vdW interactions, thereby decoupling the chemical rigidity and vdW interactions. Using this strategy, we prepared corresponding amorphous resins and conducted an indepth investigation of their macroscopic properties and microdimer binding characteristics. The macroscopic experiments demonstrated that the resin with the flexible single bonds exhibited greater apparent rigidity compared with the resin with the chemically rigid double bonds. Theoretical calculations at the microscopic level indicate that the deformability of the flexible backbone allows for more stable binding within the resin under vdW forces, thereby enhancing the apparent performance of the resin. We proposed a concise and self-consistent theoretical model to link macroscopic and microscopic phenomena, successfully explaining the loss modulus and tensile yield. Moreover, we pointed out that the enhancement of the flexible backbone, according to the energy properties, renders this effect applicable to various intermolecular interactions not limited to vdW forces. The study not only underscores the significance of the flexible backbone in designing high-performance polymers but also offers a new perspective for understanding the relationship between microscopic intermolecular interactions and the macroscopic properties of polymers.

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Remarkable effects of silicone rubber on flame retardant property and mechanical properties of crosslinked high‐density polyethylene/bio‐based magnesium phosphate flame retardant (MHPA) composite

Cited by 2 publications

References 34 publications

Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

Rational Utilization of Intermolecular Interactions: Enhancing the Mechanical Properties of Amorphous Glassy Polymer through Flexible Backbones

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