The influence of block copolymer microstructure on the toughness of compatibilized polylactide/polyethylene blends

Anderson, Kelly S.; Hillmyer, Marc A.

doi:10.1016/j.polymer.2004.10.047

Cited by 276 publications

(221 citation statements)

References 54 publications

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“…10 If we assume that b DME = b PLA , and that l = 5 Å, we calculate that l k = 10 Å, corresponding to two norbornene units. Previous theory typically assumes that these scaling laws hold when n g >> l k , but that is not necessarily true for our polymers at the transitions.…”

Section: = √ (S8)mentioning

confidence: 99%

Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers

et al. 2018

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The linear viscoelastic behavior of poly(norbornene)-graft-poly(±-lactide) was investigated as a function of grafting density and overall molar mass. Eight sets of polymers with grafting densities ranging from 0 to 100% were synthesized by living ring-opening metathesis copolymerization. Within each set, the graft chain molar mass and spacing between grafts were fixed, while the total backbone length was varied. Dynamic master curves reveal that these polymers display Rouse and reptation dynamics with a sharp transition in the zero-shear viscosity data, demonstrating that grafting density strongly impacts the entanglement molar mass. The entanglement modulus (G e) scales with inverse grafting density (n g) as G e ∼ n g 1.2 and G e ∼ n g 0 in accordance with scaling theory in the high and low grafting density limits, respectively. However, a sharp transition between these limiting behaviors occurs, which does not conform to existing theoretical models for graft polymers. A molecular interpretation based on thin flexible chains at low grafting density and thick semiflexible chains at high grafting density anticipates the sharp transition between the limiting dynamical regimes.

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Section: = √ (S8)mentioning

confidence: 99%

Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers

et al. 2018

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“…This was suggested to be related to the inability of HDPE to cavitate in combination with the lack of debonding at the PLLA/HDPE interface. 40 Compatibilization of LLDPE/PLLA Blends with Poly-(PDL-block-LLA) Copolymers. In order to obtain more insight in the compatibilizing efficiency of the block copolymers P26L74, P52L48, and P77L23 and the type polyethylene used, LLDPE/PLLA blends were prepared and investigated.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

et al. 2015

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Block copolymers consisting of a polyethylene block and a polar polymer block are interesting structures for the compatibilization of polyethylene/polar polymer blends or polyethylene-based composites. Since the synthesis of polyethylene-based block copolymers is an elaborate process, diblock copolymers consisting of “polyethylene-like” poly(pentadecalactone) (PPDL) and poly(l-lactide) (PLLA) were synthesized using a one-pot, sequential-feed ring-opening polymerization of pentadecalactone (PDL) and l-lactide (LLA). The peculiar activity of the used aluminum salen catalysts yielded a block copolymer consisting of two blocks with both a high dispersity, as a result of intrablock transesterification. Interestingly, interblock transesterification was effectively suppressed. The obtained poly(PDL-block-LLA) of various block lengths showed coincidental crystallization of the two blocks with an associated microphase-separated morphology, in which PLLA spheres with a high dispersity are distributed within the PPDL matrix. The complex morphologies is believed to arise from the presence of a whole range of block sizes as a consequence of the large dispersity of both blocks. The application of these block copolymers as compatibilizers for high density polyethylene (HDPE)/PLLA blends led to a clear change in blend morphology and a steep decrease in particle size of the dispersed phase. Furthermore, addition of the block copolymers to blends of linear low density polyethylene (LLDPE) and PLLA led to a significant increase in adhesion between the two phases. For both HDPE/PLLA and LLDPE/PLLA blends, the compatibilization efficiency of the poly(PDL-block-LLA) increased when the length of the PPDL block was increased. The presented results clearly show that PPDL can function as a substituent for various types of polyethylene, which opens up a new method for compatibilizing polyethylene with polar polymers using easy attainable “PE-like” block copolymers.

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“…In the majority of cases the blends have been produced in binary combinations with polymers derived from petrochemicals [2][3][4][5][6][7][8][9]. Gajria et al have shown that PLA is thermodynamically miscible with poly(vinyl acetate) (PVAc) over the entire concentration range, and large increases in elongation at break were observed for concentrations greater than 20 w% PVAc [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber

et al. 2016

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Citation: MASCIA, L. ...et al., 2016. Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber. Thermochimica Acta, 633, pp. 82-90. Additional Information:• This paper was accepted for publication in the journal Ther- AbstractThe reactivity of polylactic acid (PLA) with epoxidized natural rubber (ENR50) was confirmed by monitoring the changes in melt viscosity during mixing and by TGA runs.The plasticization resulting from a partial miscibilization of ENR50 during mixing was found to have opposite effects on the crystallization of the PLA matrix, depending on the temperature scanning mode. An increase in heat of crystallization (ΔHc) with increasing temperature scanning rate was observed when heated from the glassy state, while a corresponding reduction in ΔHc was obtained in cooling scans from the melt.Studies on the kinetics of events have shown that the classical Kissinger plots for crystallization by heating from the glassy state display a variable activation energy for the case of the reactive blend. The vitrification kinetics, on the other hand, could be modelled quite accurately with the Mahadevan method for all systems, including an intrinsically amorphous PLA.

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The influence of block copolymer microstructure on the toughness of compatibilized polylactide/polyethylene blends

Cited by 276 publications

References 54 publications

Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers

Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber

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