Poly(lactic acid) crystallization

Saeidlou, Sajjad; Huneault, Michel A.; Li, Hongbo; Park, Chul

doi:10.1016/j.progpolymsci.2012.07.005

Cited by 1,299 publications

(1,083 citation statements)

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“…Similar to all thermoplastic polymers, PLA exhibited Newtonian behavior at the low shear rates (<10 s -1 ) whereas it exhibited nonNewtonian behavior (shear thinning) at the high shear rates (>10 s -1 ) as shown in Figure 4. Many studies reported the rheological behavior of PLA and showed that PLA obeyed the power law (Equation (1)) over a certain range of shear rates and tem- [26] peratures in the same way where other polymers obeyed [21][22][23][24][25][26]:…”

Section: Properties Of Polylactic Acid 31 Rheological Propertiesmentioning

confidence: 99%

“…Two types of PLA were investigated, such as amorphous PLA containing 82% L-lactide and 18% D-lactide and semicrystalline PLA containing 95% L-lactide and 5% D-lactide. The results showed that the shear viscosity of the polymer increased with increasing L-isomer in the L/D-isomer mixture because of the increasing crystallinity of PLA, where the crystallinity increased with increasing L-isomer content [24]. In addition, Dorgan et al [25] investigated the effect of the structure of PLA on the rheological properties using two different types of PLA, such as linear and branched.…”

Section: Properties Of Polylactic Acid 31 Rheological Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Properties and medical applications of polylactic acid: A review

Hamad¹,

Kaseem²,

Yang

et al. 2015

Express Polym. Lett.

599

306

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Abstract. Polylactic acid (PLA), one of the well-known biodegradable polyesters, has been studied extensively for tissue engineering and drug delivery systems, and it was also used widely in human medicine. A new method to synthesize PLA (ring-opening polymerization), which allowed the economical production of a high molecular weight PLA polymer, broadened its applications, and this processing would be a potential substitute for petroleum-based products. This review described the principles of the polymerization reactions of PLA and, then, outlined the various materials properties affecting the performance of PLA polymer, such as rheological, mechanical, thermal, and barrier properties as well as the processing technologies which were used to fabricate products based on PLA. In addition, the biodegradation processes of products which were shaped from PLA were discussed and reviewed. The potential applications of PLA in the medical fields, such as tissue engineering, wound management, drugs delivery, and orthopedic devices, were also highlighted.

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Section: Properties Of Polylactic Acid 31 Rheological Propertiesmentioning

confidence: 99%

Section: Properties Of Polylactic Acid 31 Rheological Propertiesmentioning

confidence: 99%

Properties and medical applications of polylactic acid: A review

Hamad¹,

Kaseem²,

Yang

et al. 2015

Express Polym. Lett.

599

306

View full text Add to dashboard Cite

show abstract

“…This usually occurs because PLA crystallization is too slow to develop significant crystallinity. Several reviews have reported the low crystallization kinetics of PLA [41][42][43]. The second heating thermograms for the as received and processed PLA are shown in Figure 1.…”

Section: Thermal Properties Analysismentioning

confidence: 99%

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Hernández-Alamilla

Valadez-González

2015

Journal of Polymer Engineering

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Abstract The effect of two commercial melt strength enhancer additives, Paraloid BPMS-250 (BPMS) and Biostrength 700 (BIOS), on the thermal, rheological and morphological properties of polylactide (PLA) was studied. Thermal analyses showed that both the BPMS and BIOS additives decreased the ability of PLA to crystallize. The rheological tests indicated that zero-shear viscosity and storage modulus of the PLA/BPMS and PLA/BIOS blends were significantly increased with the additive content. These could be attributed to the entanglements between the PLA chains with those of the high molecular weight additive, creating a physical network which reduces the segmental mobility of PLA and improves the melt elasticity of the blend. The entanglement molecular weights (Me) of PLA/BPMS and PLA/BIOS blends were lower than those of unprocessed and processed PLA (Me≈4×104 g/mol), which suggests greater chain entanglements and a higher entanglement density (ve). The elongational viscosity (ηE) and melt strength values were estimated using a screw-extrusion capillary rheometer, where the PLA/BIOS blends presented the highest values. Finally, scanning electron microscopy on the samples was carried out to assess the blend morphology.

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“…PLA has been used intensively in food and industrial packaging [4]. Surprisingly, PLA has the potential to replace conventional petroleum-based plastics such as polystyrene, polyethylene, polypropylene, polyethylene terephthalate in many disposable or short-term applications [5].Naturally, PLA has a good mechanical properties such as high strength, high Young modulus, and high biocompatibility [6].However, PLA has some drawbacks such as its ductility at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%