An aqueous miscible organic (AMO) process for layered double hydroxides (LDHs) for the enhanced properties of polypropylene/LDH composites

Zhang, Qian; Guo, Yixuan; Leroux, Fabrice; Tang, Pinggui; Li, Dianqing; Wang, Liren; Feng, Yongjun

doi:10.1039/c9nj06444c

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…To confirm how LDH and PP to mix, FTIR spectra of composites are carried out, as shown in Figure 2B. The FTIR spectra of PP composites are similar because of the small amount of LDH, which mainly exhibits the characteristic peaks of PP 35 . The reflections at around 555 cm −1 and 687 cm −1 are attributed to metal‐oxygen vibration (M–O) and CO stretching vibration of CO 3 2− .…”

Section: Resultsmentioning

confidence: 98%

Non‐isothermal crystallization kinetics of polypropylene/layered double hydroxide composites

Guo

Bai

et al. 2021

Polymers for Advanced Techs

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The crystalline behaviors of polymers have a large impact on their physical and mechanical properties, especially as reinforcing and toughening materials in the construction industry. This work investigates the crystallization behaviors of polypropylene (PP) composites with layered double hydroxide (LDH) by using differential scanning calorimeter and a polarizing optical microscope (POM), and analyzed the non‐isothermal crystallization kinetics of PP composites by Avrami model and Mo's method. The results show that the entire process of non‐isothermal crystallization is appropriate for Mo′s method instead of Avrami model due to the offset of the curves in initial nucleation and secondary crystallization stages. The addition of LDH and modified LDH (SLDH) can increase the crystallinity (Xc) of PP despite decreasing the crystallization rate in the non‐isothermal crystallization process. The migration activation energy (∆E) indicates that LDH acts as a heterogeneous nucleating agent, which is consistent with POM results. The values of ∆E and semi‐crystallization time (t1/2) reveal that the nucleation capacity of PP/LDH is greater than that of PP/SLDH, but the crystallization rate of PP/LDH is slower than that of PP/SLDH, resulting in a decrease in Xc.

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Section: Resultsmentioning

confidence: 98%

Non‐isothermal crystallization kinetics of polypropylene/layered double hydroxide composites

Guo

Bai

et al. 2021

Polymers for Advanced Techs

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“…102 Based on the above mechanisms, our group developed a series of AMO D-LDH (h) materials (DBHP, identified using the letter D) with different acetone modification times (0, 1, 3, 6, 9, and 12 h) and prepared PP/ D-LDH (h) nanocomposites by using AMO D-LDH (h) as an antiaging nanofiller to mix with PP (Figure 17a). 103 The layered structure of D-LDH remained intact (not affected by the AMO method), but guest anions were contaminated by CO 2 . The amount of DBHP in the interlayer was altered by the cointercalation of D − and CO 3 2− in D-LDH (h), resulting in altered crystallinity, thermal stability, and radical-scavenging abilities of D-LDH (h).…”

Section: Intercalation-mediated Assemblymentioning

confidence: 95%

“…Gao et al synthesized PP/LDH–OCNT (oxidized carbon nanotubes) nanocomposites by using the AMO method and increased synergistic effect of LDH, OCNT, and PP, as well as improved mechanical, thermal, and flame-retardant qualities . Based on the above mechanisms, our group developed a series of AMO D-LDH (h) materials (DBHP, identified using the letter D) with different acetone modification times (0, 1, 3, 6, 9, and 12 h) and prepared PP/D-LDH (h) nanocomposites by using AMO D-LDH (h) as an antiaging nanofiller to mix with PP (Figure a) . The layered structure of D-LDH remained intact (not affected by the AMO method), but guest anions were contaminated by CO 2 .…”

Section: Intercalation-mediated Assemblymentioning

confidence: 99%

Antimigration Polypropylene Antioxidants: A Review

Li,

Zhang,

Jiang

et al. 2024

Ind. Eng. Chem. Res.

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Hindered phenolic antioxidants have been extensively recognized and applied to boost the heat resistance and oxidative aging performance of poly(propylene) (PP) composites. Low-molecular-weight antioxidants are easy to volatilize, migrate, and be extracted from PP or PP-based products, which can directly reduce the antithermal oxidative aging effect of PP and its composites, and it can contaminate food or drugs under its packaging. The design of an efficient and durable antioxidant with antimigration performance has drawn the attention of researchers. Currently, three main approaches are explored: (I) enhancement of molecular weight, that is, high molecular weight of antioxidants can stimulate the structure stability and the resistance toward migration; (II) inorganic immobilization, which involves immobilizing the antioxidants on inorganic substrate to enhance the dispersion and the antimigration performance; and (III) intercalation-mediated assembly, which involved intercalating low-molecular-weight antioxidants into the interlayer region of a layered host to boost antimigration performance based on the host–guest interaction.

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“…Intuitively, thinner LDH platelets should improve the dispersion state of the LDH particles into PVC, thus to be more exposed to the polymer chains and more efficient to capture HCl when PVC degrades [41][42][43][44]. Evidently, the lateral size may play a role as a barrier effect, the LDH platelets acting as a sacrificial reservoir in improving PVC stability.…”

Section: Structural Analysis Of Mg 2 Al-co 3 -Ldhmentioning

confidence: 99%

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

Guo¹,

Zhang²,

Hu³

et al. 2021

Materials Today Communications

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Developing green thermal stabilizer for poly(vinyl chloride) (PVC) today is a great challenge for materials as polymer filler. Here, the "salt-oxide/hydroxide" route in mild conditions is used to fabricate a series of Mg 2 Al-CO 3 -LDH samples from Mg(OH) 2 precursors with different average particle sizes from 202 ± 10 nm to 334 ± 13 nm. A linear correlation is observed for the lateral size of the platelets between Mg 2 Al-CO 3 -LDH samples and their associated Mg(OH) 2 precursors. After surface-organo-modification (SOM), organophilic Mg 2 Al-CO 3 -LDH samples are found to be highly dispersed into PVC and investigated as environmentfriendly thermal stabilizers. From the static/dynamic tests, the performances are strongly enhanced and related to the particle size of the LDH stabilizer, with the yellowish color aspect appearing later than for the commercial HT-3/PVC. Among the LDH series, the platelets with an average particle lateral size of about 220 ± 10 nm perform the best for the thermal stability for PVC polymer. Among the series, the corresponding PVC composite film presents comparatively the minimum color value in static/dynamic discoloration test, exhibiting the longer ignition time for proton initial release as well as the longer stability time in dehydrochlorination test. It underlines that the salt-oxide/hydroxide route is an efficient and environmentally friendly process in producing high-performance green LDH stabilizer for PVC.

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An aqueous miscible organic (AMO) process for layered double hydroxides (LDHs) for the enhanced properties of polypropylene/LDH composites

Abstract: AMO D-LDH (h) antioxidants are fabricated using an acetone solvent, and the modified time is optimized based on the anti-aging performance of PP/D-LDH (h).

Cited by 10 publications

References 30 publications

Non‐isothermal crystallization kinetics of polypropylene/layered double hydroxide composites

Non‐isothermal crystallization kinetics of polypropylene/layered double hydroxide composites

Antimigration Polypropylene Antioxidants: A Review

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

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