Miscibility, melting, and crystallization behavior of poly(hydroxybutyrate) and poly(D,L‐lactic acid) blends

Abstract

Melting behavior and crystal morphology of poly(3‐hydroxybutyrate)‐poly(D,L‐lactic acid) (PHB‐RPLA) blends with various compositions have been investigated by modulated temperature differential scanning calorimetry (mt‐DSC), polarized optical thermomicroscopy (POTM), modulated force thermomechanometry (mf‐TM), and small angle X‐ray scattering (SAXS). Thermal properties were investigated after fast cooling crystallization treatment. Multiple melting peak behavior was observed for all polymers. mt‐DSC data revealed that PHB‐RPLA blends undergo melting‐recrystallization‐remelting during heating, as evidenced by exothermic peaks in the nonreversing heat capacity. A decrease in degree of crystallinity due to significant melt‐recrystallization was observed for blends. PHB‐RPLA showed different crystal morphologies for various compositions. POTM results showed that the crystallization rates and sizes of spherulites were significantly reduced as RPLA content increased. mf‐TM results confirmed miscibility of these two polymers. SAXS data provided evidence of lamella thickness of blends, which increased with increasing RPLA content. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

Interactions, structure and properties in poly(lactic acid)/thermoplastic polymer blends

“…The number of papers on the blending of biopolymers is vast, partly because of the huge number and wide diversity of these polymers and partly because of the increased interest in them. PLA and starch are the most often studied materials [36][37][38][39][40][41][42][43][44][45], but one could mention poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/poly(vinyl phenol) [46], thermoplastic phenol formaldehyde resin/poly(!-caprolactone) (PCL) [47], poly(3-hydroxybutyrate) (PHB)/PCL [48], PLA/poly(butylene succinate) (PBS) [49,50], poly(3-hydroxybutyrate-co-3-hydroxihexanoate)/poly (lactic acid) (PLA) [51], PHB/PLA [52], etc. without even attempting to be comprehensive.…”

Multiple melting behavior of poly(lactic acid)-hemp-silica composites using modulated-temperature differential scanning calorimetry

“…The C p NR curve is a valuable curve for determining the irreversible or non-reversing process in polymers. A baseline value with an empty aluminum pan was Brought to you by | Western University Authenticated Download Date | 6/10/15 2:55 AM is no structural change in this region, except during the melting events with a broad endotherm [20,21]. Technically, the zero C p ″ implies a successful mT-DSC scan.…”

“…The first melting endotherm observed in the C p ′ curve at lower temperature was due to the formation of secondary crystals during heating for all composites and the melting peak at a high temperature corresponds to primary crystals. Previous research proposed that multiple melting behavior of a polymer was linked either to the process of partial mrr or melting of different crystal structures [13][14][15][17][18][19][20][21].…”

“…Melting behavior including multiple melting has been observed for many semicrystallines [12][13][14][15][16][17][18][19][20][21]. The main model of double melting behavior is a melt-recrystallization model that has been explained.…”

Recent Strategies for the Development of Biosourced-Monomers, Oligomers and Polymers-Based Materials: A Review with an Innovation and a Bigger Data Focus

“…Poly(3-hydroxybutyrate-co-3-hydroxy-hexanoate)/Poly(vinyl phenol) [210] Thermoplastic phenol formaldehyde resin/(PCL) [211] Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)/PLA [212] Polyhydroxybutyrate(PHB/PLA) [213] PLA/Poly(butylene succinate) (PBS) [214] PHB/PCL [215] PLA/(PEG) [216] PHB/PBS [217] PHB/Cellulose acetate butyrate [218] PLA/Poly(epichlorohydrin-co-ethylene oxide) (PEEO) [219] Poly(propylene carbonate)/Poly(ethylene-co-vinyl alcohol) [220] [221]…”