The relationship between morphology and impact toughness of poly(l-lactic acid)/poly(ethylene oxide) blends

Li, Jinze; Schultz, J. M.; Chan, Chi‐Ming

doi:10.1016/j.polymer.2015.02.049

Cited by 28 publications

(12 citation statements)

References 46 publications

(37 reference statements)

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“…The lines joining the points are meant only as a guide to the eye not experience hindrance from A-polymer, since A-polymer already crystallized within its own domains. Thus, the mode of crystallization in case of two-step cooling appears to be sequential crystallization, as evident by the recent experimental observation on PLLA/PEO [60] and PEO/PES blend [61]. In PLLA/PEO blend, crystallinity and spherulite size decreases with decreasing crystallization temperature.…”

Section: Isothermal Crystallizationmentioning

confidence: 70%

“…For example, PC in PCL/PC blend [38], increases the degradation temperature of PCL with a decrease in melting point, and reduction in crystallinity; PBS in PCL/PBS blend [39], retards the crystallization of PCL; whereas, PEO in PCL/ PEO blend [40], does not affect the crystallization of PCL, however, the crystallization of PEO is affected by PCL. Similarly, PEO in PLLA/PEO blend [60] increases the toughness of PLLA; PHB in PLLA/PHB blend [31] increases the melting point of PLLA; POM in PLA/POM blend [19] increases the heat deflection temperature of PLA. Therefore, by changing B-polymer (viz., PC, PBS or PEO) in PCL/B binary blend, the properties of PCL and the blend can suitably be tuned for specific applications.…”

Section: Structural Analysismentioning

confidence: 99%

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Phase separation and crystallization in double crystalline symmetric binary polymer blends

Dasmahapatra

2016

J Polym Res

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Blending of two or more pure polymers is an effective way to produce composites with tunable properties. In this paper, we report dynamic Monte Carlo simulation results on the crystallization of crystalline/crystalline (A/B) symmetric binary polymer blend, wherein the melting temperature of A-polymer is higher than B-polymer. We study the effect of segregation strength (arises from the immiscibility between Aand B-polymers) on crystallization and morphological development. Crystallization of A-polymer precedes the crystallization of B-polymer upon cooling from a homogeneous melt. Simulation results reveal that the morphological development is controlled by the interplay between crystallization driving force (viz., attractive interaction) and de-mixing energy (viz., repulsive interaction between two polymers). With increasing segregation strength, the interface becomes more rigid and restricts the development of crystalline structures. Mean square radius of gyration shows a decreasing trend with increasing segregation strength, reflecting the increased repulsive interaction between A-and B-polymers. As a consequence, a large number of smaller size crystals form with lesser crystallinity. Isothermal crystallization reveals that the transition pathways strongly depend on segregation strength. We also observe a path-dependent crystallization behavior in isothermal crystallization: two-step (sequential) isothermal crystallization yields superior crystalline structure in both A-and B-polymers than one-step (coincident) crystallization.

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Section: Isothermal Crystallizationmentioning

confidence: 70%

Section: Structural Analysismentioning

confidence: 99%

Phase separation and crystallization in double crystalline symmetric binary polymer blends

Dasmahapatra

2016

J Polym Res

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“…Some research groups have used electron microscope images for direct observation upon removing PEO [22,23]. In this study, where and how PEO would crystallize under DLI is analyzed as supplementary evidence.…”

Section: Crystallization and Degradation Behavior Of Peo/plla Blendsmentioning

confidence: 99%

Using depolarized light intensity to study the crystallization and degradation behavior of poly(l-lactic acid) and its blends with poly(ethylene oxide)

Zhang

Singfield

2016

Polym. Bull.

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The crystallization and degradation behaviors of poly(L-lactic acid) (PLLA) and its blends with poly(ethylene oxide) (PEO) were investigated by depolarized light intensity (DLI). It was found that DLI is sensitive to study the degree of order in polymer thin film samples. The growth rate of the PLLA spherulites was increased by blending up to 80 % PEO, as it increased the chain mobility in the blend melts. At larger PEO compositions (i.e., 90 % PEO), the dilution effect dominates and the PLLA growth rate was retarded. Three distinct blend groups with respect to the blend composition were proposed: (1) 10-20 wt% PEO in which the PEO is not able to form any ordered structure in the binary blend;(2) 30-50 wt% PEO in which the PEO is able to form some order but not enough to develop spherulitic crystals; (3) 60-90 wt% PEO in which the PEO forms a network of spherulites throughout the pre-crystallized PLLA.

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“…Numerous investigations have found that phase morphology and interfacial compatibility have strong influences on toughening efficiency . For common ‘sea–land’ structures, such as poly( l ‐lactic acid) (PLLA) blends, the optimal size of the dispersed phase is 0.7–1.0 µm for high impact toughness of blends .…”

Section: Introductionmentioning

confidence: 99%

Effect of the composition and degree of crosslinking on the properties of poly(l‐lactic acid)/crosslinked polyurethane blends

Zheng

et al. 2018

Polymer International

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Poly(L-lactic acid)/crosslinked polyurethane (PLLA/CPU) blends which were prepared via reactive blending of PLLA with poly( -caprolactone) (PCL), glycerol and 4,4 ′ -methylenediphenyl diisocyanate showed excellent toughness. The effects of the composition of the mixture and degree of crosslinking of CPU on the toughness of the PLLA/CPU blends (80/20 w/w) were studied in detail. Dynamic mechanical analysis and rheological measurements were used to characterize the structure of the in situ formed CPU in the PLLA matrix. A novel netlike phase structure was observed when the average molecular weight of PCL and degree of crosslinking were 1 kDa and 10%, respectively. The impact strength of the blend was enhanced from 2.2 kJ m −2 for pure PLLA to 62.4 kJ m −2 ; meanwhile, the elongation at break was increased to 489.8%. Therefore, the mechanical properties of PLLA/CPU blends can be easily tailored by tuning the composition of the mixture and the degree of crosslinking of CPU.

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The relationship between morphology and impact toughness of poly(l-lactic acid)/poly(ethylene oxide) blends

Abstract: The morphology of unannealed and annealed poly(L-lactic) acid (PLLA)/polyethylene oxide (PEO) (80/20) and (50/50) blends were studied using polarized optical microscopy (POM), scanning electron microscopy (SEM) and time-of-flight secondary ion mass spectrometry (ToF- SIMS

Cited by 28 publications

References 46 publications

Phase separation and crystallization in double crystalline symmetric binary polymer blends

Phase separation and crystallization in double crystalline symmetric binary polymer blends

Using depolarized light intensity to study the crystallization and degradation behavior of poly(l-lactic acid) and its blends with poly(ethylene oxide)

Effect of the composition and degree of crosslinking on the properties of poly(l‐lactic acid)/crosslinked polyurethane blends

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