Phase Structure and Properties of Ternary Polylactide/Poly(methyl methacrylate)/Polysilsesquioxane Blends

Area of Science:

• Polymer Science
• Materials Science
• Nanotechnology

Background:

• Polylactide (PLA) and poly(methyl methacrylate) (PMMA) blends are widely used but can benefit from property enhancement.
• Functionalized polysilsesquioxanes (LPSQ-R) offer tunable chemical properties for material modification.

Purpose of the Study:

• To investigate the effect of different functionalized polysilsesquioxanes (LPSQ-R) on the structure and properties of PLA/PMMA blends.
• To explore the influence of LPSQ-R type and concentration on blend morphology, thermal behavior, and mechanical performance.

Main Methods:

• Solution blending was used to prepare ternary blends of PLA, PMMA, and LPSQ-R.
• Techniques including SEM-EDS, DMTA, Raman spectroscopy, DSC, tensile testing, and depth-sensing indentation were employed.
• Micro- and nano-scale mechanical properties (hardness, elastic behavior) were spatially resolved.

Main Results:

• The type and content (1-3 wt.%) of LPSQ-R significantly modulated the blend structure and properties.
• SEM-EDS, DMTA, Raman, DSC, and tensile tests revealed distinct effects of different LPSQ-R moieties (LPSQ-OH, LPSQ-COOMe, LPSQ-F5).
• Depth-sensing indentation provided detailed insights into micro- and nano-scale mechanical property variations.

Conclusions:

• Functionalized polysilsesquioxanes are effective modifiers for PLA/PMMA blends.
• LPSQ-R can be tailored to achieve specific structural and property enhancements in polymer blends.
• This study demonstrates a pathway for developing advanced polymer composites with controlled characteristics.