UV absorber co-intercalated layered double hydroxides as efficient hybrid UV-shielding materials for polypropylene

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polypropylene (PP) is susceptible to photodegradation, limiting its outdoor applications.
• Effective UV-shielding additives are crucial for enhancing the durability and lifespan of PP materials.
• Layered double hydroxides (LDH) offer a promising platform for developing novel UV-shielding materials due to their unique structure and intercalating capabilities.

Purpose of the Study:

• To synthesize a novel UV-shielding material by co-intercalating 2-hydroxy-4-methoxy-benzophenone-5-sulphonic acid (HMBA) and cinnamic acid (CA) into Mg2ZnAl layered double hydroxides (LDH).
• To evaluate the UV-shielding performance and anti-photoaging capabilities of the prepared HMBA-CA-LDH material when incorporated into polypropylene (PP).

Main Methods:

• Modified coprecipitation method for co-intercalating HMBA and CA into Mg2ZnAl LDH.
• Solvent casting method for preparing LDH/PP composites with evenly dispersed LDH nanosheets.
• Characterization of UV absorption, thermal stability, and anti-photoaging performance.

Main Results:

• The synthesized HMBA-CA-LDH exhibited significantly enhanced UV absorption across the entire UV spectrum compared to individual HMBA-LDH and CA-LDH.
• LDH/PP composites demonstrated improved thermal stability and anti-photoaging properties compared to pristine PP.
• HMBA-CA-LDH/PP composites showed superior anti-photoaging performance, reducing PP photodegradation by approximately 85% due to synergistic UV-shielding effects.

Conclusions:

• The co-intercalation of HMBA and CA into LDH creates a highly efficient UV-shielding material with synergistic effects.
• The developed HMBA-CA-LDH is a promising additive for enhancing the photoaging resistance of polypropylene.
• This novel material holds potential for applications requiring improved UV protection in polymer-based products.