Synergism of cellulosic nanowhiskers and graft structure in stereocomplex-based materials: formation in solution and a stereocomplex memory study

Purnama, Purba; Kim, Jeongrae

doi:10.1007/s10570-014-0300-9

Cited by 9 publications

(27 citation statements)

References 28 publications

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“…Several studies on PLA grafts and the corresponding stereocomplexation have been reported with cellulose in the nanoscale dimensions (e.g., nanocrystalline cellulose (NCC) , and cellulose nanowhiskers (CNW) , as well as in the microscale range. The use of cellulose as a nucleating agent could suppress the crystallization of single polymers and facilitate both SC formation and crystal size control. ,, For example, Lemstra and his co-workers reported that nanohybrid NCC- g -PLLA grafts in solvent casted PDLA nanocomposites resulted in higher stereocomplexation rate in comparison with the mixture of PDLA and PLLA homopolymers. The rapid crystallization behavior was evidenced by the increased SC formation temperature (∼145 °C) and crystallinity (38%) when the materials were processed by a fast cooling treatment from the melt at 250 °C. , In addition, the half crystallization time detected at 175–190 °C was reduced by 84%–92% in the presence of NCC- g -PLLA, indicating better process-ability for practical use.…”

Section: Thermal and Mechanical Enhancement By Stereocomplexation Of ...mentioning

confidence: 99%

“…The use of cellulose as a nucleating agent could suppress the crystallization of single polymers and facilitate both SC formation and crystal size control. 35,118,121 For example, Lemstra and his co-workers reported that nanohybrid NCC-g-PLLA grafts in solvent casted PDLA nanocomposites resulted in higher stereocomplexation rate in comparison with the mixture of PDLA and PLLA homopolymers. The rapid crystallization behavior was evidenced by the increased SC formation temperature (∼145 °C) and crystallinity (38%) when the materials were processed by a fast cooling treatment from the melt at 250 °C.…”

Section: Stereocomplexation Of Enantiomeric Pla-based Polymer Graftsmentioning

confidence: 99%

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Recent Progress in Using Stereocomplexation for Enhancement of Thermal and Mechanical Property of Polylactide

Tan

Muiruri

Liu

et al. 2016

ACS Sustainable Chem. Eng.

211

142

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Polylactide (PLA) has been receiving significant attention in biopolymer research due to its excellent biodegradability, biocompatibility and sustainability. The mass production of PLA from renewable agricultural resources has delved this green material as a top alternative to replace the petroleum-based conventional polymers. However, the inherent weaknesses of PLA in its raw state such as brittleness, low heat distortion temperature and recrystallization rate, as well as the inadequate crystallization ability and degree after fast processing have limited the competitive edge of PLA over traditional synthetic plastics in industrial use or for biomedical applications. Being different from other types of biodegradable polymers, the diverse isomeric forms of PLA have provided great opportunities for thermal and mechanical enhancement through stereocomplexation formation. In this review, we present the most recent development in thermal and mechanical enhancement of PLA via stereocomplexation of PLA in different polymeric systems, including enantiomeric PLA homopolymers, PLA-based block and graft copolymers, as well as enantiomeric PLA materials having unique architectures such as cyclic, star, dendritic and comb-shaped. Insightful discussion on the influence of crystal structure and intermolecular interactions between PLLA and PDLA in the different polymeric systems on the enhanced performance of the resultant materials are provided. The enhanced PLA with diverse functions oriented toward engineering materials and their biosignificance in different areas are also covered in this review.

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Section: Thermal and Mechanical Enhancement By Stereocomplexation Of ...mentioning

confidence: 99%

Section: Stereocomplexation Of Enantiomeric Pla-based Polymer Graftsmentioning

confidence: 99%

Recent Progress in Using Stereocomplexation for Enhancement of Thermal and Mechanical Property of Polylactide

Tan

Muiruri

Liu

et al. 2016

ACS Sustainable Chem. Eng.

211

142

View full text Add to dashboard Cite

show abstract

“…Moreover, the crystallization in the form of stereocomplex after melting was, unusually, completely reversible, without the formation of any HC crystallites. The synergetic effect of cellulosic nanowhiskers (CNW) particles and the graft structure from PDLA-g-CNW and PLLA-g-CNW contributing to stereocomplex formation in solution was researched by Purnama et al (107). Their results showed that the graft structure as a core of PLA nanocomposites enhanced the stereocomplex formation in solution, and the generated SC nanocomposite showed stereocomplex memory.…”

Section: Stereocomplexation Via Chemicalphysical Routementioning

confidence: 99%

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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“…Polylactide (PLA), which is regarded as a promising biodegradable polymer, naturally exists in distinct forms of poly( l -lactide) (PLLA) (levorotatory) and poly( d -lactide) (PDLA) (dextrorotatory) owing to its chirality. − Formation of stereocomplex crystals can be induced between two enantiomers in racemic blends. , Stereocomplex PLA (sc-PLA) can possess significantly improved physical and mechanical properties as well as thermal resistance. Eco-friendly polymeric materials based on sc-PLA can be applied to applications that must endure high external stress and loads. , Stereocomplexation of PLA is commonly induced by solution blending, , melt blending, , and supercritical fluid (SCF) technology. , Our research group has been continuously investigating stereocomplexation for many years. − However, the methods developed thus far have many drawbacks, such as low processability, low yield, low solubility with solvent and solute, high cost, and slow production. It has been reported that PLLA/PDLA mixtures in solution induce the formation of stereocomplexes with distinctive physical and chemical stability due to their van der Waals interactions. , However, these supramolecular interactions are weak with reversible noncovalent interaction between molecules and are insufficient to induce rapid formation of stereocomplex crystal.…”

Section: Introductionmentioning

confidence: 99%

Strategy for Stereocomplexation of Polylactide Using O/W Emulsion Blending and Applications as Composite Fillers, Drug Carriers, and Self-Nucleating Agents

Park

Jung

et al. 2020

ACS Sustainable Chem. Eng.

Self Cite

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Biodegradable polymer polylactide (PLA) can form stereocomplex crystals through racemic blending between poly(Llactide) (PLLA) and poly(D-lactide) (PDLA). This stereocomplexation could lead to substantially improved mechanical and physical strengths for PLA. Various methods for preparing stereocomplex PLA (sc-PLA) have been studied, e.g., solution blending, melt blending, and supercritical fluid (SCF) technology. However, current methods inevitably have various drawbacks including poor efficiency, usability, and low stereocomplexation reaction speeds. Thus, the aim of this study is to develop a novel strategy using oil-in-water (O/W) emulsion blending to overcome the current limitations of stereocomplexation. Our results indicate that the developed strategy can considerably improve the efficiency and accessibility of stereocomplex crystal formation compared to conventional methods such as solution blending and SCF technology. The O/W emulsion blending method exhibits a stereocomplexation efficiency of up to nearly 99%. Additionally, the sc-PLA produced by O/W emulsion blending can act as filler in PLA composites, leading to improvement of their mechanical properties. In addition, a cancer drug such as fluorouracil (5-FU) could be infiltrated into sc-PLA during stereocomplexation induced by O/W emulsion blending. Furthermore, sc-PLA with 5-FU prepared by the novel method could be added for ISN-polymerization in order to give both a nucleating effect and an anticancer effect. It suggests that sc-PLA prepared by our novel method could act as a stable carrier for secondary molecules as well as nucleating agents.

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Synergism of cellulosic nanowhiskers and graft structure in stereocomplex-based materials: formation in solution and a stereocomplex memory study

Cited by 9 publications

References 28 publications

Recent Progress in Using Stereocomplexation for Enhancement of Thermal and Mechanical Property of Polylactide

Recent Progress in Using Stereocomplexation for Enhancement of Thermal and Mechanical Property of Polylactide

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

Strategy for Stereocomplexation of Polylactide Using O/W Emulsion Blending and Applications as Composite Fillers, Drug Carriers, and Self-Nucleating Agents

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