The inexistence of epitaxial relationship between stereocomplex and α crystal of poly(lactic acid): Direct experimental evidence

Wen, Tao; Zhang, Xiong; Liu, Guoming; Zhang, Xiuqin; Vos, Sicco de; Wang, Ryan; Joziasse, Cornelis A.P.; Wang, Dujin

doi:10.1016/j.polymer.2013.02.010

Cited by 35 publications

(41 citation statements)

References 42 publications

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“…Before annealing, no clear Debye circle was observed for linear PLLA and 30 %hyper branched PLLA blend, confirming their amorphous state. However, in the case of 7% hyper branched PDLA blend, rings at 2 h equal to 11.5, 20.5 and 23.7 which represent (110), (300)/(030) and (220) planes for stereocomplex crystals (Wen et al, 2013) were detectable before the annealing process. After the annealing, Debye circles at 2 h equal to 16.4 and 18.6 representing (200)/(110) and (203) reflections of homocrystal (Zhang et al, 2008) were observed for all the samples; however, their intensity distribution was not similar and was depended on the type of material and drawing conditions.…”

Section: Xrd Analysismentioning

confidence: 95%

Enhanced Film Blowing of Polylactide by Incorporating Branched Chains and Stereocomplex Crystals

Nouri

Lafleur

Dubois

2015

International Polymer Processing

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Chain architecture is an influential parameter in melt processing of polymeric material. In this study effect of different chain structures on polylactide (PLA) film blowing process and on the final film properties was investigated. Blends of linear PLA with three branched poly(L-lactide)s with 4-arms star shaped, comb like and hyper branched structures were prepared by twin screw extruder. In another series of blending, poly(D-lactide) of these branched structures were used to obtain stereocomplex crystal. Operating window of blends were determined in as eries of film blowing process experiments with different blow up and take up ratio and results were compared to linear PLA as ar eference. Moreover, different characterization techniques were applied to determine the properties of produced films. It was found that addition of branched architecture and presence of stereocomplex in a linear PLA matrix result in ag reater operating window for film blowing and improve mechanical and crystallization properties of blown films.

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Section: Xrd Analysismentioning

confidence: 95%

Enhanced Film Blowing of Polylactide by Incorporating Branched Chains and Stereocomplex Crystals

Nouri

Lafleur

Dubois

2015

International Polymer Processing

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“…17 Based on this observation, we found a new methodology that allowed us to prepare the TCs with different morphologies under same condition. 17 Based on this observation, we found a new methodology that allowed us to prepare the TCs with different morphologies under same condition.…”

Section: Introductionmentioning

confidence: 92%

“…17 Briefly, the blend fiber used in the present work was prepared by melt-spinning from a capillary rheometer (RH7, Bohlin). 17 Briefly, the blend fiber used in the present work was prepared by melt-spinning from a capillary rheometer (RH7, Bohlin).…”

Section: Preparation Of Fibers and Transcrystallizationmentioning

confidence: 99%

Study on fracture behavior of PLLA transcrystallization: Effect of crystalline morphology

Wen

Zhang

et al. 2014

J of Applied Polymer Sci

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In the present work, the fracture behavior of transcrystallization (TC) of poly(L-lactic acid) (PLLA) in thin film and the dependence of mechanical properties on the morphology of TC have been studied. The nucleation density of TC was merely determined by the annealing temperatures of the fibers which used for inducing nucleation, and the crystallization temperature and time of the samples were completely identical. By using in situ polarized optical microscopy, the fracture process of TCs was characterized. For the TC with high nucleating density (TC-H), lots of cracks were generated from the TC bulk during fracture. But only few cracks were observed on the TC with low nucleation density (TC-L), and the final fracture of TC-L always occurred in the junctions of crystal segments. Compared to the samples which do not contain TC, the fracture strength was enhanced by 8.1% because of the presence of TC-H. On the contrary, the presence of TC-L can reduce the fracture strength of the samples. The fracture surfaces of TC were characterized by scanning electron microscope. It was observed that the fracture surface of TC-H exhibited obvious fibrillation and cavitation, but the fracture surface of TC-L was smooth and featureless. The possible fracture mechanism for two TCs was discussed in view of their intrinsic crystal organizations.

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“…Although the possibility of epitaxial crystallization has been ruled out by Wen et al [43], it is still a fact that SC is an efficient nucleating agent for a crystals. A simple hypothesis is that oriented SC will nucleate oriented a crystals.…”

Section: In-situ Waxs Under Different Shear Ratesmentioning

confidence: 99%

Enhancement of stereocomplex formation in poly(l-lactide)/poly(d-lactide) mixture by shear

Song

Zhang

Yin

et al. 2015

Polymer

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The inexistence of epitaxial relationship between stereocomplex and α crystal of poly(lactic acid): Direct experimental evidence

Cited by 35 publications

References 42 publications

Enhanced Film Blowing of Polylactide by Incorporating Branched Chains and Stereocomplex Crystals

Enhanced Film Blowing of Polylactide by Incorporating Branched Chains and Stereocomplex Crystals

Study on fracture behavior of PLLA transcrystallization: Effect of crystalline morphology

Enhancement of stereocomplex formation in poly(l-lactide)/poly(d-lactide) mixture by shear

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