Mechanical characterization of polyhydroxyalkanoate and poly(lactic acid) blends

Loureiro, Nuno Calçada; Esteves, J. L.; Viana, J. C.; Ghosh, Satyabrata

doi:10.1177/0892705712475020

Cited by 25 publications

(7 citation statements)

References 8 publications

(18 reference statements)

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“…Similarly, the second melting peak is in agreement with that of PHA, which was measured as 173 °C for PHA films . The presence of two separate peaks confirms the high immiscibility of the two phases . As a comparison, PLA filament and the pure PLA specimen printed at 210 °C have melting temperatures around 170 °C.…”

Section: Resultsmentioning

confidence: 69%

Improving the ductility of polylactic acid parts produced by fused deposition modeling through polyhydroxyalkanoate additions

Kaygusuz

Özerinç

2019

J of Applied Polymer Sci

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Polylactic acid (PLA) is one of the most commonly used materials for fused deposition modeling (FDM) due to its low cost, biocompatibility, and desirable printing characteristics. However, its low ductility is a major disadvantage for engineering applications where high damage tolerance is needed. This study investigates the feasibility of polyhydroxyalkanoate (PHA) additions to PLA for improving the ductility of parts produced by FDM. Thermal and mechanical behavior of PLA/PHA specimens containing 12 wt % PHA is investigated for a range of printing nozzle temperatures. All PLA/PHA specimens exhibit amorphous PLA phase with semicrystalline PHA and possess outstanding ductility exceeding 160% for nozzle temperatures in the range of 200 C-240 C. Lower and higher nozzle temperatures result in low ductility, similar to that of pure PLA. Overall, PLA/PHA is a very promising polymer blend for FDM processes, providing a combination of sufficient strength with excellent damage tolerance.

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Section: Resultsmentioning

confidence: 69%

Improving the ductility of polylactic acid parts produced by fused deposition modeling through polyhydroxyalkanoate additions

Kaygusuz

Özerinç

2019

J of Applied Polymer Sci

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“…The KUT model is commonly used to assess the interfacial adherence in immiscible polymer blends. [47][48][49][50] This model assumes the blend has spherical inclusions of a polymer (disperse,…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/thermoplastic polyurethane blends with improved mechanical and barrier performance

Martínez‐Abad

González‐Ausejo

Lagarón

et al. 2016

Polymer Degradation and Stability

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“…Therefore, research efforts are devoted to the improvement of PHAs performance, mainly by means of blending with other polymers, fiber reinforcements, or nanofillers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. In particular, a huge amount of articles report about modification of poly(3-hydroxybutyrate-co23-hydroxyvalerate) (PHBV) resins by blending with many polymers such as polyvinyl chloride [12], poly(propylene carbonate) [13], poly(L-lactic) acid [14][15][16], poly(ethylene succinate) [17], polyolefins [18], polycaprolactone [19], and poly(butylene adipate-co-terephthalate) (PBAT) [20,21,[25][26][27]. The latter, in particular, is one of the most studied and interesting for its beneficial effects, and thus, they are developed biodegradable commercial formulations, traded as ENMATV R , consisting of PHBV/PBAT blends.…”

Section: Introductionmentioning

confidence: 99%

Photooxidative weathering of biodegradable nanocomposite films containing halloysite

2015

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This study reports the results of photodegradation experiments performed on biodegradable nanocomposite blown films based on a commercial grade of poly(3-hydroxybutyrate-co−3-hydroxyvalerate)/poly(butylene adipate-co-terephthalate) blend added with different amounts (3, 5, and 10 wt%) of tubular halloysite nanoclays, natural and organomodified. The films, subjected to photooxidative weathering in a climatic chamber under UV exposure, were systematically analyzed to check the chemical and physical changes induced by the aging protocol, taking the as-produced films as the reference materials. In particular, the samples were characterized using several techniques [colorimetry, water contact angle tests, UV–vis, attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectrophotometry, X-ray diffraction, oxygen permeability, and mechanical tests]. The experiments demonstrated that all nanocomposite films, when compared with the unfilled one, show higher changes in the total color difference ΔE* and higher reduction in the average transparency due to the changes in the molecular structure of the polymer (hydrolysis of the ester linkage, multiple chain scissions, and crosslinking), as observed from ATR-FTIR analysis. The phenomenon, which basically involves the amorphous phase, tends to increase with the nanofiller percentage in the films and is more relevant in the presence of the organomodified halloysite. As a consequence of the photodegradation of the amorphous polymer chains that increase their molecular mobility, the oxygen permeability worsens, even in the presence of nanofillers. Instead, in terms of mechanical response, the addition of pure and organomodified halloysite to polymer matrix had positive effects on tensile properties both before and after photooxidation

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Mechanical characterization of polyhydroxyalkanoate and poly(lactic acid) blends

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Cited by 25 publications

References 8 publications

Improving the ductility of polylactic acid parts produced by fused deposition modeling through polyhydroxyalkanoate additions

Improving the ductility of polylactic acid parts produced by fused deposition modeling through polyhydroxyalkanoate additions

Biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/thermoplastic polyurethane blends with improved mechanical and barrier performance

Photooxidative weathering of biodegradable nanocomposite films containing halloysite

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