Compatibility of poly(butadiene‐co‐acrylonitrile) with poly(L‐lactide) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate)

Abstract

Poly(l-lactide) (PLLA) and poly(3-hydrobutyrate-co-3-hydroxyvalerate) (PHBV) were blended with poly(butadiene-co-acrylonitrile) (NBR). Both PLLA/NBR and PHBV/NBR blends exhibited higher tensile properties as the content of acrylonitrile unit (AN) of NBR increased from 22 to 50 wt %. However, two separate glass transition temperatures (T g ) appeared in PLLA/NBR blends irrespective of the content of NBR, revealing that PLLA was incompatible with NBR. In contrast, a single T g , which shifted along with the blend composition, was observed for PHBV/ NBR50 blends. Moreover NBR50 suppressed the crystallization of PHBV, indicating that PHBV was compatible with NBR50. Decrease of both elongation modulus and stress at maximum load was less significant and increase of elongation at break was more pronounced in PHBV/NBR50 blends than in PLLA/NBR50 blends.

Morphology and properties of renewable poly(3-hydroxybutyrate-co -3-hydroxyvalerate) blends with thermoplastic polyurethane

“…For nanomodification method, clay , CNTs , boron nitride , hydroxyapatite et al were used as nucleating agents to improve the toughness and thermal stability of PHBV. For polymer blending method, starch , PCL , ENR are immiscible with PHBV while PVAc , PVPh , PVDF , NBR are miscible with it. However, the improvement of mechanical properties was not significantly or the added materials were not environmental friendly.…”

The effect of crosslinking on the mechanical properties of polylactic acid/polycaprolactone blends

“…The serious issues of its mechanical properties are brittle behavior and low impact strength. Recently, synthetic rubbers were even‐blended with PLA to improve impact strength while bearing in mind the restriction that only a limited quantity of petroleum based materials could be added to retain its biodegradable nature 5. Lately, the authors attempted to create materials that could withstand practical application while their biodegradation properties are maintained 6, 7…”

Effect of processing conditions on the development of morphological features of banded or nonbanded spherulites of poly(3‐hydroxybutyrate) (PHB) and polylactic acid (PLLA) blends

“…The crystalline morphology depends on the crystallization conditions since their components could be crystalline at a wide crystallization temperature range. It has been found that PLLA is immiscible with PHB (higher molecular weight) [7–11], poly(butadiene‐ co ‐acrylonitrile) (NBR) [12], poly( p ‐dioxanone) [13], poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHB‐ co ‐PHV) [14], poly (vinyl alcohol) (PVA) [15], poly(butylene succinate) (PBS) [16], poly(caprolactone) [17], poly(ethylene succinate) [18, 19] and thermoplastic starch [20]. Conversely, PLLA is miscible with poly(vinyl acetate) (PVAc) [21] and poly(ethylene oxide) [21].…”