PMMA/PLA

L207S) with PMMA. A cocontinuous morphology was identified using the volume fraction ratio and viscosity ratio of the components and dynamic mechanical analysis (DMA). It was observed that PMMA/PLA L210 and PMMA/PLA L207S have cocontinuous compositions at 48 and 28wt% PLA content, respectively. The cocontinuous composition provided superior mechanical properties such as higher modulus. 

Zhang et al. [71] studied blends of PMMA/poly (d,l-lactide) (PDLLA) at various concentrations. The blends prepared by solution precipitation were characterized by DSC. All the PMMA/PLA blend compositions demonstrated a single Tg (Figure 16.7a). The authors fitted the Gordon-Taylor equation (Equation 16.3) to understand the interaction between the two polymers (Figure 16.7b). 

The phase diagrams with respect to temperature for the PMMA/PLA blend system are highly dependent on die molar mass, which contributes to entropic terms. 

Poly(lactide), PLA Poly(lactide-co-glycolide), PLGA polyethylene glicol), PEG Poly(methyl methacrylate), PMMA. 

Abbreviations sc, supercritical CDFM, chlorodifluoromethane PCL, polycaprolactone PGA, polyglycolic acid PLA, polylactic acid PMMA, polylmethyl methacrylate). 

PEG/ lysozyme or lipase PMMA/ lysozyme or lipase PLA/lysozyme or lipase PLGA/lysozyme or lipase... 

Abbreviations ASES, aerosol solvent extraction system BSA, bovine serum albumin PCA, precipitation with compressed antisolvent PLA, polylactic acid PLGA poly(lactic-co-glycolic acid) PMMA, poly(methyl methacrylate) PPG, poly(propylene glycol) RESS, rapid expansion of supercritical solution TFE, 2,2,2-trifluoroethanol. 

In this article, we prepared PP-g-PMMA graft copolymers with different polymer stmctures through a controlled radical polymerization with a PP macroiititiator derived from the hydroxylated PP. In addition, we have confirmed that the thus-obtained graft copolymer worked as a compatibilizer for PP/PLA polymer blends and herein discuss the effect of PP-g-PMMA on the mechanical properties of the PP/PLA polymer blends. 

Entry PP/PLA/ PP-g-PMMA (weight ratio) Tensile Strength (MPa) Young s Modulus (MPa) Elongation at Break (%)... 

Figure 5. Effect of the weight fraction of PLA on (a) the tensile strength and (b) the Young s modulus of the PP/PLA binary blend (triangles) and the PP/PLA/PP-g-PMMA ternary blend (squares).

Figure 7. Morphologies of PP/PLA (40/60) polymer blend observed by (a) optical microscopy or (b) TEM and (c) PP/PLA/PP-g-PMMA (40/60/5) polymer...

One of the most promising applications of polyolefin hybrids is a compatibilizer for blend polymer for polyolefin and non-polyolefin. In Figure 7, TEM micrographs of PP/PMMA and EBR/poly(lactic acid) (PLA) blend polymers with and without polyolefin hybrids as a compatibilizer are displayed. Figure 7(a) represents the phase stracture of a PP/PMMA (62/38 wt%) blend polymer. Since PP and PMMA are immiscible, huge PMMA domains (> 20 pm) exist in the PP matrix. When 5 wt% of PP-g-PMMA (PMMA contents 38 wt%) was added to this blend polymer as a compatibilizer, PMMA domains were finely dispersed as is shown in Figure 7(b). As a result, the physical properties for both FM and FS were drastically enhanced from 35.3 MPa for FS and 1800 MPa for FM to 61.4 MPa for FS and 2200 MPa for FM, respectively. 

Figure 7(c) shows the phase stmcture of the blend polymer composed of EBR/PLA (15/85 wt%). Macro-phase separated EBR domains in the PLA matrix were observed. By adding 5 wt% of PE-/ -PMMA (PMMA contents 75 wt%) to EBR/PLA (10/85 wt%) as a compatibilizer, finely dispersed EBR domains are observed in Figure 7(d). As a result, this polymer indicates very high Izod impact strength value (378 J/m) vis-a-vis the blend polymer s value... 

Figure 7. TEM Micrographs of (a) PP/PMMA (Weight ratio 68/32) (b) PP/PMMA/PP-g-PMMA (Weight ratio 68/32/5) (c) PLA/EBR (Weight ratio 85/15) (d) PLA/EBR/PE-b-PMMA (Weight ratio 85/15/5)...

---