Material Design in Poly(Lactic Acid) Systems: Block Copolymers, Star Homo- and Copolymers, and Stereocomplexes

Spinu, M.; Jackson, Christian; Keating, M. Y.; Gardner, K. H.

doi:10.1080/10601329608014922

Cited by 154 publications

(70 citation statements)

References 81 publications

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“…The most widely used method for improving PLA processability is based on T m depression by the random incorporation of small amounts of lactide enantiomers of opposite configuration into the polymer (i.e., adding a small amount of D-lactide to the L-lactide to obtain PDLLA). On the other hand, unfortunately, the T m depression is accompanied by a significant decrease in crystallinity and crystallization rates [139].…”

Section: Processing Thermal Degradation and Recyclabilitymentioning

confidence: 99%

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Physical and mechanical properties of PLA, and their functions in widespread applications — A comprehensive review

Farah

Anderson

Langer

2016

Advanced Drug Delivery Reviews

2,387

1,486

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Available online xxxxPoly(lactic acid) (PLA), so far, is the most extensively researched and utilized biodegradable aliphatic polyester in human history. Due to its merits, PLA is a leading biomaterial for numerous applications in medicine as well as in industry replacing conventional petrochemical-based polymers. The main purpose of this review is to elaborate the mechanical and physical properties that affect its stability, processability, degradation, PLA-other polymers immiscibility, aging and recyclability, and therefore its potential suitability to fulfill specific application requirements. This review also summarizes variations in these properties during PLA processing (i.e. thermal degradation and recyclability), biodegradation, packaging and sterilization, and aging (i.e. weathering and hygrothermal). In addition, we discuss up-to-date strategies for PLA properties improvements including components and plasticizer blending, nucleation agent addition, and PLA modifications and nanoformulations. Incorporating better understanding of the role of these properties with available improvement strategies is the key for successful utilization of PLA and its copolymers/composites/blends to maximize their fit with worldwide application needs.© 2016 Elsevier B.V. All rights reserved. Contents lists available at ScienceDirectAdvanced Drug Delivery Reviews

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Section: Processing Thermal Degradation and Recyclabilitymentioning

confidence: 99%

“…PLA homopolymers have a T g and T m of about 55°C and 175°C, respectively. They require processing temperatures in excess of 185-190°C [139]. At these temperatures, unzipping and chain scission reactions leading to loss of Mw, as well as thermal degradation, are known to occur.…”

Section: Processing Thermal Degradation and Recyclabilitymentioning

confidence: 99%

Physical and mechanical properties of PLA, and their functions in widespread applications — A comprehensive review

Farah

Anderson

Langer

2016

Advanced Drug Delivery Reviews

2,387

1,486

View full text Add to dashboard Cite

show abstract

“…The high price also limits its use as a packaging material. 7,8 For designing novel biodegradable materials, polymer blends present a faster and economic way. Blending PDLLA with other polymers can improve its undesirable properties, lower cost, and enlarge its applications.…”

Section: Introductionmentioning

confidence: 99%

Miscibility and phase behavior of poly(D,L-lactide)/poly(p-vinylphenol) blends

Zhang

Goh

Lee

1998

J. Appl. Polym. Sci.

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ABSTRACT:The miscibility of poly(D,L-lactide) (PDLLA) and poly(p-vinylphenol) (PVPh) blends has been studied by differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR). Phase separation was observed in blends over a wide composition range. A PDLLA-rich phase was found to coexist with an almost pure PVPh phase. The quenched blend samples showed two glass transitions (T g s), except for a blend with a low PVPh content. However, the T g value of the PDLLA-rich phase showed a gradual increase with increasing PVPh content. No evidence of interassociation (hydrogen bond formation) between PDLLA and PVPh was found by FTIR. The phase behavior of the blends was simulated using an association model. The results suggested that the equilibrium constant of interassociation between PDLLA and PVPh was small. The phase compositions of the two separated phases were calculated using Fox, Gordon-Taylor, and Couchman equations. The amount of PVPh in the PDLLA-rich phase increased with increasing PVPh content in the blend.

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“…Similarly, in stereocopolymers of L-lactide and D-or DLlactide, the melting temperatures of the semicrystalline copolymers decrease as the content of D-units increases (Vert, 1986). This random incorporation of a small amount of lactide enantiomer of opposite configuration has been utilized in varying the degradation profile, but it has also been the most widely used method for improving PLA processability (Spinu, 1996;Kolstad, 1996). Copolymers of lactide and ε-caprolactone (CL) have a wide variety of mechanical properties, ranging from elastomeric to rigid, depending on the composition and the average sequence length .…”

Section: Copolymerization Of Poly (Lactic Acid)mentioning

confidence: 99%

Synthesis and Characterization of PLA-Based Aliphatic-Aromatic Copolyesters: Effect of Diols

Namkajorn

Petchsuk

Opaprakasit

et al. 2008

AMR

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AcknowledgementI wish to express my deepest and sincere gratitude to my supervisor, Asst. Prof. Dr. Pakorn Opaprakasit for his supervision, valuable instructions, excellent suggestions, kindness and assistance on the preparation of this thesis. This accomplishment would not be possible without his help.Moreover, I feel very thankful and grateful to Dr. Atitsa Petchsuk, Dr. Mantana Opaprakasit for their kindness and valuable discussion and comments on this thesis.My appreciation is also extended to the staff of the School of Bio-Chemical Engineering and Technology and the department of Common and Graduate Studies, Sirindhorn International Institute of Technology (SIIT), Thammasat University.Unforgettably, this work was made possible by a financial support from the SIIT-NSTDA scholarship and partial support from the teaching assistant program.I would like to thank all of my colleagues for great cooperation and the best wonderful relationship. Finally, thank you my lovely family for their love and encouragement.Montree Namkajorn ii Abstract PLA-based aliphatic aromatic copolyesters have been synthesized and characterized in order to incorporate the degradability of PLA and good mechanical property of aromatic species. Synthesis of the copolymer was conducted by polycondensation of lactic acid with dimethyl terephthalate (DMT) and diols using Stannous(II)octoate as a catalyst. Four types of diols with different methylene length were employed, i.e., ethylene glycol (EG), propylene glycol (PG), 1, 4-butanediol (BD), 1,3-propanediol (PD). Effects of diols and comonomer ratio on the polycondensation and the molecular weight of resulting copolymers were investigated. Diacids and diol ratios of L-lactic acid (LLA), dimethyl terephthalate (DMT) and diol of 1/1/2, 1/2/4, and 2/1/2 were employed, respectively. Characterization of chemical property, molecular weight, thermal property and degradability of the resulting copolymers were conducted by FTIR, UV, NMR, TGA, and DSC experiments.

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Material Design in Poly(Lactic Acid) Systems: Block Copolymers, Star Homo- and Copolymers, and Stereocomplexes

Cited by 154 publications

References 81 publications

Physical and mechanical properties of PLA, and their functions in widespread applications — A comprehensive review

Physical and mechanical properties of PLA, and their functions in widespread applications — A comprehensive review

Miscibility and phase behavior of poly(D,L-lactide)/poly(p-vinylphenol) blends

Synthesis and Characterization of PLA-Based Aliphatic-Aromatic Copolyesters: Effect of Diols

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