Effect of Star-shaped chain architectures on the polylactide stereocomplex crystallization behaviors

Zhou, Kang; Li, Jianbo; Wang, Han-Xuan; Ren, Jie

doi:10.1007/s10118-017-1935-4

Cited by 19 publications

(15 citation statements)

References 47 publications

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“…In previous work, the formation of SC would also cause low‐frequency shift . As reported, the hydrogen bonding between PLLA and PDLA leads to the PLA SC formation, which can be verified by FTIR spectral measurements.…”

Section: Resultssupporting

confidence: 75%

“…Miktoarm star‐shaped copolymers, also called asymmetric star copolymers, heteroarm star copolymers, or simply miktoarm copolymers, are star‐shaped copolymers with certain amount of different polymer arms radiating from a core . In our previous work, we have discussed the SC crystallization behaviors of linear/linear, linear/star‐shaped, and star‐shaped/star‐shaped blends . However, whether a miktoarm star‐shaped PLA copolymer possesses the same or peculiar crystallization behavior has not been systematically studied.…”

Section: Introductionsupporting

confidence: 65%

“…29 In our previous work, we have discussed the SC crystallization behaviors of linear/ linear, linear/star-shaped, and star-shaped/star-shaped blends. 30 However, whether a miktoarm star-shaped PLA copolymer possesses the same or peculiar crystallization behavior has not been systematically studied.…”

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confidence: 99%

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Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Xie

Wang

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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The miktoarm star‐shaped poly(lactic acid) (PLA) copolymer, (PLLA)2‐core‐(PDLA)2, was synthesized via stepwise ring‐opening polymerization of lactide with dibromoneopentyl glycol as the starting material. 1H NMR and FTIR spectroscopy proved the feasibility of synthetic route and the successful preparation of star‐shaped PLA copolymers. The results of FTIR spectroscopy and XRD showed that the stereocomplex structure of the copolymer could be more perfect after solvent dissolution treatment. Effect of chain architectures on crystallization was investigated by studying the nonisothermal and isothermal crystallization of the miktoarm star‐shaped PLA copolymer and other stereocomplexes. Nonisothermal differential scanning calorimetry and polarizing optical microscopy tests indicated that (PLLA)2‐core‐(PDLA)2 exhibited the fastest formation of a stereocomplex in a dynamic test due to its special structure. In isothermal crystallization tests, the copolymer exhibited the fast crystal growth rate and the most perfect crystal morphology. The results reveal that the unique molecular structure has an important influence on the crystallization of the miktoarm star‐shaped PLA copolymer. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 814–826

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Section: Resultssupporting

confidence: 75%

Section: Introductionsupporting

confidence: 65%

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Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Xie

Wang

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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“…Through non-isothermal and isothermal crystallization kinetics analysis, it is concluded that the half crystallization time of the blends is signicantly shortened and the crystallization rate increases with the addition of PEG and TMC-306. Zhou et al 24 synthesized linear PLLA, linear PDLA, starshaped PLLA and star-shaped PDLA by ring-opening polymerization with 3-butyn-1-ol and pentaerythritol as initiators, respectively. In these blends, the crystallization rate of starshaped PLLA/PDLA and PLLA/star-shaped PDLA stereocomplex is fast, and the crystallinity is high compared with pure PLLA.…”

Section: Introductionmentioning

confidence: 99%

Effect of molecular weight of polyethylene glycol on crystallization behaviors, thermal properties and tensile performance of polylactic acid stereocomplexes

Bai

et al. 2020

RSC Adv.

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“…The melting point of SC (around 230°C) is approximately 50°C higher than that of homo-crystals (HC); hence, this has become a hot spot in the field of PLA crystallization. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] For PLLA/PDLA racemic blends with higher molecular weight, the growth of HC and SC competes. 32 For crystallization from solution and the melt, the upper boundary of molecular weights to completely form SC is approximately 40 and 6 kg mol −1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of epoxy resin crosslinking networks on stereocomplexation of poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends

Meng

et al. 2020

Polymer International

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In contrast to existing methods that add specific substances to poly(L-lactic acid)/poly(D-lactic acid) racemic blends to enhance stereocomplexation, in this study, a crosslinkable epoxy resin (EP) was introduced into a racemic blend. The results showed that, when the mass ratio of EP to racemic blend was 0.2:1 (EP:racemic blend = 0.2), regardless of the amount of diethylenetriamine (DETA) curing agent, homo-crystals in the racemic blend were essentially inhibited. With a fixed EP content, a 0.05:1 DETA to EP mass ratio resulted in a homogeneous poly(L-lactic acid)/poly(D-lactic acid)/EP/DETA mixture. Uniformly dispersed EP network promoted the stereocomplexation of the racemic blend from the melt, but delayed the lamellar thickening of the stereocomplex crystals during heating. Thus, the constrained chain diffusion caused by the uniformly dispersed EP network was likely responsible for these contradictory results. Introducing uniformly dispersed network into poly(L-lactic acid)/poly(D-lactic acid) racemic blends is presumably a promising approach for gaining more insight into poly(lactic acid) stereocomplexation.

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Effect of Star-shaped chain architectures on the polylactide stereocomplex crystallization behaviors

Cited by 19 publications

References 47 publications

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Miktoarm star‐shaped poly(lactic acid) copolymer: Synthesis and stereocomplex crystallization behavior

Effect of molecular weight of polyethylene glycol on crystallization behaviors, thermal properties and tensile performance of polylactic acid stereocomplexes

Effects of epoxy resin crosslinking networks on stereocomplexation of poly(l‐lactic acid)/poly(d‐lactic acid) racemic blends

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