Poly(lactic acid)/polyoxymethylene blends: Morphology, crystallization, rheology, and thermal mechanical properties

Guo, Xinwen; Zhang, Jinwen; Huang, Jingsong

doi:10.1016/j.polymer.2015.05.050

Cited by 51 publications

(52 citation statements)

References 26 publications

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“…Our simulation results are in close agreement with the experimental observation, where high melting component crystallizes first and suppresses the crystallization of the low melting component [12,59]. Recent experimental observation by Guo et al [19] reveals that even for an immiscible blend (PLA/POM) with closely spaced melting Overall with U p (~1/T) for λ = 0, 1, 2, 3, 4, 5 and 6. HA in (a) represents the data for pure A-polymer.…”

Section: Development Of Crystallinity During Non-isothermal Coolingsupporting

confidence: 90%

“…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%

“…The chemical dissimilarity leads to the formation of macrophase separated domains [6][7][8] influencing the morphology of the resultant composites. For a miscible blend, a single glass transition temperature (T g ) is observed [9][10][11][12][13][14][15][16][17], however, for immiscible polymer blends, two distinct glass transition temperatures for individual component are observed [18,19].…”

Section: Introductionmentioning

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: Development Of Crystallinity During Non-isothermal Coolingsupporting

confidence: 90%

Section: Structural Analysismentioning

confidence: 99%

Section: Introductionmentioning

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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“…On the other hand, improving heat resistance has also drawn increasing attention in the area of PLLA modifications [3,[32][33][34]. The poor heat resistance, namely low HDT, arises from the low degree of crystallinity during thermal processing, ascribed to the extremely slow crystallization rate of PLLA.…”

Section: Introductionmentioning

confidence: 99%

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Zeng

et al. 2017

Sci. China Mater.

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Inherent brittleness and low heat resistance are the two major obstacles that hinder the wide applications of poly(L-lactide) (PLLA). In this study, we report a fully biobased, highly toughened and heat-resistant PLLA ternary blend, which was prepared by dynamic vulcanization of PLLA with poly(D-lactide) (PDLA) and an unsaturated bioelastomer (UBE). The results indicated that during dynamic vulcanization PDLA cocrystallized with PLLA to form stereocomplex (SC) crystallites, which not only enhanced the molecular entanglement but also accelerated the crystallization rate of PLLA matrix. With increase in the content of PDLA, the matrix molecular entanglement increased while phase-separation was enhanced, which enabled the impact strength to increase first and then decrease. The ternary blends containing 10 wt.% PDLA showed the highest impact strength. The presence of SC crystallites makes it possible to achieve a fully sustainable PLLA/VUB/PDLA ternary blend with highly crystalline matrix under conventional injection molding, due to the high nucleation efficiency of SC towards crystallization of PLLA. The highly crystalline ternary blend showed excellent heat resistance and better impact toughness than high impact polystyrene.

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“…[31][32][33][34] Alternatively, the introduction of advanced polymers, featuring higher heat resistance, [35][36][37][38][39] inside the blend, can represent another viable strategy. The use of nucleating agents in the form of mineral fillers can promote the formation of the crystalline phase and at the same time confer additional thermal resistance to the biodegradable polymer.…”

Section: Introductionmentioning

confidence: 99%

Improvements in mechanical strength and thermal stability of injection and compression molded components based on Poly Lactic Acids

et al. 2017

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Degradable polymers are limited by their often-insufficient mechanical and thermal properties, which limit their usage to single-use packaging items at room temperature and in dry conditions. In this respect, the present work deals with the manufacture of custom-built Poly Lactic Acids (PLAs), which are designed to be compostable, suitable for food contact and are characterized by a good compromise between mechanical properties and thermal stability. A commercial grade PLA was, therefore, compounded in a twin-screw co-rotating extruder by the use of specific additives: maleated and glycidyl methacrylate PLAs as compatibilizers/chain extenders and microlamellar talc as mineral filler/nucleation promoter. After pelletizing, the resulting compounds were melt-processed by injection and compression molding.Differential scanning calorimetry, flexural tests in static machine and top-hat cylindrical flat indentations were performed to evaluate the thermal and mechanical response of the molded components. The experimental findings show that crystallization of the PLA can be controlled by fine-tuning the compound formulation as well as by properly setting the processing parameters. In addition, achievement of the appropriate crystallization degree in the polymer can lead to molded components, which exhibit improved mechanical strength and high thermal stability. K E Y W O R D Scompostable polymer, mechanical response, melt processing, molding, thermal stability

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Poly(lactic acid)/polyoxymethylene blends: Morphology, crystallization, rheology, and thermal mechanical properties

Cited by 51 publications

References 26 publications

Phase separation and crystallization in double crystalline symmetric binary polymer blends

Phase separation and crystallization in double crystalline symmetric binary polymer blends

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Improvements in mechanical strength and thermal stability of injection and compression molded components based on Poly Lactic Acids

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