Stereocomplexation of Poly(<scp>l</scp>-lactide) and Random Copolymer Poly(<scp>d</scp>-lactide-<i>co</i>-ε-caprolactone) To Enhance Melt Stability

Purnama, Purba; Jung, Youngmee; Kim, Jeongrae

doi:10.1021/ma202814c

Cited by 70 publications

(79 citation statements)

References 26 publications

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“…The SC can be used for broad applications such as films, fibers, plastics and the above discussed nucleating agents (78). Stereocomplexation is heavily influenced by preparation routes, processing conditions and molar mass of PLA (79)(80)(81). The stereocomplexation mechanism between enantiomeric poly(lactide)s were investigated by Brizzolara et al (82) They proposed simultaneous folding of the two enantiomeric chains in stereocomplexation which explained the triangular shape of single crystals.…”

Section: Pla Stereocomplexationmentioning

confidence: 99%

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Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Jiang

Shen

et al. 2016

E-Polymers

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Poly(lactide), PLA, as one of the most promising biopolymers, has been receiving increasing attention in recent years because of its excellent performances in renewability, mechanical properties, biocompatibility and biodegradability. However, its application is limited by its brittleness and low heat distortion temperatures (HDT). The low HDT mainly results from a low crystallization rate and lack of crystallinity after fast processing, e.g. injection molding. Consequently, considerable attention was paid, in recent years, to achieve fast(er) crystallization of PLA. In here, we briefly review the research progress in the crystallization modification of PLA notably by means of adding nucleating agents and stereocomplexation.

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Section: Pla Stereocomplexationmentioning

confidence: 99%

“…In general, low-M w , equal molar ratio and solutionmethods are favorable for stereocomplexation, but a high-M w and melt-processing is preferred in industrial practice (79)(80)(81). The HC crystallites prevailed SC crystallites when the M w of PLA was over 10 5 g/mol (83,84).…”

Section: Pla Stereocomplexationmentioning

confidence: 99%

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Jiang

Shen

et al. 2016

E-Polymers

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“…At 5% TCP content, stereocomplex degree of s-PDLCL/TCP decreases drastically to about ~44%. The presence of !-caprolactone fragments in the s-PDLCL results in decreasing stereocomplex degree compared to the streocomplex formed from polylactide homopolymer [4]. The presence of inorganic materials also caused a decreasing stereocomplex degree due to the interruption of the interaction between L-and D-lactide fragments to form stereocomplex [17].…”

Section: Resultsmentioning

confidence: 98%

“…It could not achieve 100% of stereocomplex during 5 h stereocomplexation processing time. As mentioned in the literature, the presence of !-caprolactone fragments bothers the interaction between L-and D-lactide fragments to form stereocomplex [4]. In the biocomposite system, the presence of inorganic materials also affects the interaction with the polymer matrix [17].…”

Section: Resultsmentioning

confidence: 99%

“…The precipitate was removed from the solution by centrifugal separation. These powders were washed five times with distilled water to completely remove free residual PO 4 3-ions, and dried at 60°C under vacuum before used. Evacuation was used to minimize residual water in order to reduce the formation of ungrafted PLLA and L-lactide hydrolisis [13,14].…”

Section: Grafting Of Lactide Onto Surface-modifiedmentioning

confidence: 99%

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Preparation and characterization of a stereocomplex of poly(lactide-co-ε-caprolactone)/tricalcium phosphate biocomposite using supercritical fluid technology

Nurqadar¹,

Purnama²,

Kim³

2013

Express Polym. Lett.

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Absorbable materials are attractive for internal fracture fixation devices. They have advantages in the reduction of stress shielding, secondary operations for removal are no longer required, and the risks of complications are reduced [1]. Biopolymers such as polylactide, poly(glycolic acid), poly(!-caprolactone), and their copolymers attract great attention due to their biodegradability and biocompatibility. The major limitation of those materials is that their mechanical properties (as strength, toughness, elastic modulus) are lower than the mechanical properties of cortical bones. Abstract. A novel biocomposite material from a stereocomplex of poly (L-lactide-co-!-caprolactone) (PLLCL) and poly (D-lactide-co-!-caprolactone) (PDLCL) and inorganic tricalcium phosphate (TCP) was prepared by supercritical fluid method. Both pristine and poly (L-lactide)-grafted-TCP (PLLA-g-TCP) were used. PLLA-g-TCP was produced by ringopening polymerization of L-lactide in the presence of surface-activated TCP. Infrared (IR) spectroscopy and scanning electron microscopic (SEM) images confirm the attachment of PLLA onto the activated TCP surface. The stereocomplex formation of biocomposite was confirmed by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The biocomposite containing PLLA-g-TCP has higher stereocomplex degree and more homogeneous TCP distribution compared to the biocomposite containing pristine TCP. The presence of PLLA-g-TCP in the stereocomplex PLLCL-PDLCL (s-PDLCL) enhance the stereocomplex degree up to a certain content and also supports the homogeneous TCP dispersion in the stereocomplex matrix. These phenomena support the improvement in mechanical properties of the s-PDLCL composite the optimum content of PLLA-g-TCP being 10%. The biocomposites containing TCP materials are promising materials for biomedical application, especially for bone tissue engineering.

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Preparation, Structure, and Properties of Stereocomplex‐type Poly(lactic Acid)

Mulchandani¹,

Kimura²,

Katiyar³

2022

Poly(Lactic Acid)

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Stereocomplexation of Poly(l-lactide) and Random Copolymer Poly(d-lactide-co-ε-caprolactone) To Enhance Melt Stability

Cited by 70 publications

References 26 publications

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Preparation and characterization of a stereocomplex of poly(lactide-co-ε-caprolactone)/tricalcium phosphate biocomposite using supercritical fluid technology

Preparation, Structure, and Properties of Stereocomplex‐type Poly(lactic Acid)

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