Synthesis and properties of stereo mixtures of enantiomeric block copolymers of polylactide and aliphatic polycarbonate

Abstract

Enantiomeric A‐B‐A tri‐block copolymers of polylactides (A) and aliphatic polycarbonates (B) were mixed to prepare stereo mixtures that are applicable as thermoplastic elastomers having high thermal resistivity.

Fully bio-renewable multiblocks copolymers of poly(lactide) and commercial fatty acid-based polyesters polyols: Synthesis and characterization

“…Stereocomplexation between enantiomeric PLA has been found to occur between polymer chains of varying architecture, including random copolymers [55] and PLA-amorphous triblock copolymers [41,56]. This test confirms that PDLA and PLLA chain segments can co-crystallize even in segmented multiblocks copolymers, composed of a random sequence of polylactide and amorphous blocks.…”

“…The dihydroxyl terminated polymer is then used as a macro-initiator for the subsequent ring-opening polymerization of lactide. A variety of polymers can be used as soft block [16,17,21,27,31,38,41], provided that they have a suitably low glass transition temperature, and that they can be obtained with proper terminal functional groups. Recently, the research focused on the development of fully biobased PLA-containing triblocks copolymers, by employing biorenewable soft blocks, such as amorphous polyhydroxyalkanoates [18,26], polymethide [28] and polyesters derived from castor oil [44].…”

High‐molecular‐weight poly(1,2‐propylene succinate): A soft biobased polyester applicable as an effective modifier of poly(l‐Lactide)

“…As for amorphous polymers, few biobased polymers have emerged until now except for natural rubber and a glassy polycarbonate consisting of isosorbide (Durabio ® ) . Poly(hexamethylene carbonate) (PHMC) and poly(3‐methyl‐1,5‐pentylene succinate) that have recently been commercialized are representative soft polymers prepared from environmentally benign substances . Hillmyer et al .…”

Biorenewable Thermoplastic Elastomeric Triblock Copolymers Containing Salicylic Acid‐Derived End‐Blocks and a Fatty Acid‐Derived Midblock

“…By contrast, relatively few polymers have been examined in the literature as replacements for the glassy endblocks in triblock copolymer TPEs. The dominant focus in the literature has been the use of polylactide, [ 26,[33][34][35][36][37][38][39] a commercially available biodegradable polymer sourced from plant sugars. Additionally, polymers derived from menthide, [ 31 ] α-methylene-γ-butyrolactone found in tulips, [ 40,41 ] polysaccharides, [ 32,42 ] rosin acid, [ 42 ] methacrylated vanillin (a model lignin compound), [ 25 ] and other plant-derived molecules [ 29 ] have been investigated.…”