Miscible PMMA/PLLA

Both blends. PLLA/PMA and PLLA/PMMA, presented some degree of miscibility in the melt but after cooling if an adequate thermal treatment is applied, the crystallization tendency of PLLA acted as the drivir.g force for phase separation and the formation of segregated crystalline micro-domains. 

In the PLLA/PMMA blend, the crystallization of PLLA was restricted by PMMA. Once the thermal history of the blends was destroyed. PLLA and PMMA were miscible. 

The Tg composition relationship for both PDLLA/PMMA and PLLA/PMMA miscible systems obeyed the Gordon-Taylor equation. 

In a previous study, it was established that PLLA/PMMA blends, which are mixed with a solution/precipitation method, are miscible [120). In the present study it was confirmed that PLLA/PMMA blends, which are mixed with a two-roll mill, are also miscible. 

Experimental results that there is no more favorable tendency of PDLLA to form miscible blends with PMMA than PLLA does when PLLA is in the amorphous state. 

The Tg behavior indicated the miscibility of PLLA and PMMA blends. 

In amtinuing the previous studies proving existence in Mw-dependenre UCST behavior in blends of atactic PMMA with PLLA, this study investigated the relationship between the chain configuration in PMMA and blends miscibility or UCST behavior. 

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