Compatibility and epitaxial crystallization between Poly(ethylene) and Poly(ethylene)-like polyesters

Pepels, Mark P. F.; Kleijnen, Rob G.; Goossens, Jgp Han; Spoelstra, Anne B.; Tandler, Renate; Martens, Hans; Soliman, Maria; Duchateau, Robbert

doi:10.1016/j.polymer.2016.01.035

Cited by 12 publications

(15 citation statements)

References 34 publications

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“…Even though the PPDL does not cocrystallize with HDPE, the ability of PPDL to exhibit epitaxial crystallization from the HDPE domains leads to a significant increase in the adhesion. 25 Therefore, the interfacial morphology is more an interphase, than an interface, in which PPDL functions as a shell layer around the HDPE. To confirm that the block copolymers are responsible for the compatibilization, HDPE20 containing 5 wt % P100L0 (PPDL homopolymer) was prepared and analyzed, which resulted in a similar morphology as the noncompatibilized HDPE/PLLA blend.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…23,24 Even though "PE-like" polyesters such as PPDL are not fully miscible with PE, the similarity of the crystal lattice dimension of both polymers leads to epitaxial crystallization of PPDL from the PE lamellae, which strongly increases the adhesion between the two phases. 25 Recently, Todd et al reported the synthesis of PPDL-block-PLLA copolymers using a sequential feed polymerization of PDL and LLA using organic catalysts, in which the consecutive polymerization steps were performed at different temperatures in order to avoid transesterification. These copolymers were shown to be effective compatibilizers for PLLA/poly(ωhydroxytetradecanoate) blends, which results from the molecular similarity of PPDL and poly(ω-hydroxytetradecanoate) (methylene/ester group ratio = 14 and 13, respectively).…”

Section: ■ Introductionmentioning

confidence: 99%

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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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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

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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“…If OPDL were crystallizing upon degradation, one would observe a step in the degradation curve due to sudden formation of 3D structures, as was, for example, observed for poly(β-hydroxybutyrate). [13] This result is rather remarkable, because PPDL has been described as polyethylene like, [3,14] meaning that it is highly crystalline and hydrophobic. Such a polymer is not expected to form amorphous layers at the air-water interface.…”

Section: Resultsmentioning

confidence: 95%

“…This result is rather remarkable, because PPDL has been described as polyethylene like, [ 3,14 ] meaning that it is highly crystalline and hydrophobic. Such a polymer is not expected to form amorphous layers at the air‐water interface.…”

Section: Resultsmentioning

confidence: 99%

Assessing the Influence of Temperature‐Memory Creation on the Degradation of Copolyesterurethanes in Ultrathin Films

Machatschek

Saretia

Lendlein

2021

Adv Materials Inter

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Copolyesterurethanes (PDLCLs) based on oligo(ε‐caprolactone) (OCL) and oligo(ω‐pentadecalactone) (OPDL) segments are biodegradable thermoplastic temperature‐memory polymers. The temperature‐memory capability in these polymers with crystallizable control units is implemented by a thermomechanical programming process causing alterations in the crystallite arrangement and chain organization. These morphological changes can potentially affect degradation. Initial observations on the macroscopic level inspire the hypothesis that switching of the controlling units causes an accelerated degradation of the material, resulting in programmable degradation by sequential coupling of functions. Hence, detailed degradation studies on Langmuir films of a PDLCL with 40 wt% OPDL content are carried out under enzymatic catalysis. The temperature‐memory creation procedure is mimicked by compression at different temperatures. The evolution of the chain organization and mechanical properties during the degradation process is investigated by means of polarization‐modulated infrared reflection absorption spectroscopy, interfacial rheology and to some extend by X‐ray reflectivity. The experiments on PDLCL Langmuir films imply that degradability is not enhanced by thermal switching, as the former depends on the temperature during cold programming. Nevertheless, the thin film experiments show that the leaching of OCL segments does not induce further crystallization of the OPDL segments, which is beneficial for a controlled and predictable degradation.

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“…[19][20][21] Yet, PDL is of high commercial and scientific interest, since the properties of poly (ω-pentadecalactone) PPDL resemble those of low density polyethylene (LDPE). [22][23][24] The polymerization of PDL has found great benefit from the fast reaction kinetics associated LP polymerization. 4,13,25 Nevertheless, polymerization of PDL generally requires high reaction temperatures and long reaction times to achieve high conversions, 4 decreasing the environmental benefit of its use.…”

Section: Introductionmentioning

confidence: 99%

Linear not cyclic – unravelling an anionic initiation pathway for Lewis pair polymerization of lactones

et al. 2023

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Compatibility and epitaxial crystallization between Poly(ethylene) and Poly(ethylene)-like polyesters

Cited by 12 publications

References 34 publications

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

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

Assessing the Influence of Temperature‐Memory Creation on the Degradation of Copolyesterurethanes in Ultrathin Films

Linear not cyclic – unravelling an anionic initiation pathway for Lewis pair polymerization of lactones

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