Fractionated crystallization and fractionated melting behaviors of poly(ethylene glycol) induced by poly(lactide) stereocomplex in their block copolymers and blends

Bao, Jianna; Dong, Xiaolei; Chen, Shichang; Lü, Wangyang; Zhang, Xianming

doi:10.1016/j.polymer.2020.122189

Cited by 15 publications

(14 citation statements)

References 52 publications

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“…To address these sturdy and tensile disadvantages, a number of studies have been done so far to modify PLA by blending it with other polymers, which still keep the superlative properties of PLA (such as the combining binary and ternary immiscible blends) of polylactide (PLA) with poly [(butylene adipate)-co-terephthalate] (PBAT) and poly [(butylene succinate)-co-adipate] (PBSA), 11 PMMA, 12 poly-amide11 (PA11), 13 polyethylene glycol, 14,15 PVC, 16 PCL, 17 and poly (propylene glycol). 18 Among these agents, starch is considered to have potential and is a promising candidate for combining with PLA. Starch is comprised of amylose and amylopectin and used as a thermoplastic polymer when it is plasticized by polarized plasticizing agents with low molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Valorization of starch nanoparticles on microstructural and physical properties of PLA‐starch nanocomposites

Nguyen

Thuc

et al. 2021

J of Applied Polymer Sci

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Starch nanoparticles, synthesized from native starch through the hydrolysis approach, are considered as potential reinforcers to sustainable biodegradable nanocomposite with poly(lactic)acid. Some properties of nanocomposites are upgraded to expand their applications compared to poly(lactic) acid. As relevant, starch nanoparticles are spherically shaped with mainly distributive sizes under 80 nm. Especially, they are homogeneously dispersed in the matrix polymer at high content, resulting in improving the interfaces between matrix polymer and starch nanoparticles, thermal stability, and mechanical properties of nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Valorization of starch nanoparticles on microstructural and physical properties of PLA‐starch nanocomposites

Nguyen

Thuc

et al. 2021

J of Applied Polymer Sci

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“…AB-type diblock copolymers with one or two crystallizable blocks have been studied in the past few decades. Among medium or strongly segregated systems, the diblock copolymer PE- b -PLLA [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ] is a well-known system. Müller et al [ 19 , 20 , 21 ] reported strong segregation strength for these diblock copolymers and a lamellar morphology for compositions close to 50/50.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of a third potentially crystallizable block to diblock copolymers results in a more complex analysis of the crystallization behavior. Few studies have been published about tricrystalline triblock terpolymers, such as ABC-type triblock terpolymers and ABCBA pentablock terpolymers, including the apolar PE block, and the polar PEO, PCL, and PLLA blocks [ 17 , 24 , 37 , 42 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 ].…”

Section: Introductionmentioning

confidence: 99%

Crystallization and Morphology of Triple Crystalline Polyethylene-b-poly(ethylene oxide)-b-poly(ε-caprolactone) PE-b-PEO-b-PCL Triblock Terpolymers

et al. 2021

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The morphology and crystallization behavior of two triblock terpolymers of polymethylene, equivalent to polyethylene (PE), poly (ethylene oxide) (PEO), and poly (ε-caprolactone) (PCL) are studied: PE227.1-b-PEO4615.1-b-PCL3210.4 (T1) and PE379.5-b-PEO348.8-b-PCL297.6 (T2) (superscripts give number average molecular weights in kg/mol and subscripts composition in wt %). The three blocks are potentially crystallizable, and the triple crystalline nature of the samples is investigated. Polyhomologation (C1 polymerization), ring-opening polymerization, and catalyst-switch strategies were combined to synthesize the triblock terpolymers. In addition, the corresponding PE-b-PEO diblock copolymers and PE homopolymers were also analyzed. The crystallization sequence of the blocks was determined via three independent but complementary techniques: differential scanning calorimetry (DSC), in situ SAXS/WAXS (small angle X-ray scattering/wide angle X-ray scattering), and polarized light optical microscopy (PLOM). The two terpolymers (T1 and T2) are weakly phase segregated in the melt according to SAXS. DSC and WAXS results demonstrate that in both triblock terpolymers the crystallization process starts with the PE block, continues with the PCL block, and ends with the PEO block. Hence triple crystalline materials are obtained. The crystallization of the PCL and the PEO block is coincident (i.e., it overlaps); however, WAXS and PLOM experiments can identify both transitions. In addition, PLOM shows a spherulitic morphology for the PE homopolymer and the T1 precursor diblock copolymer, while the other systems appear as non-spherulitic or microspherulitic at the last stage of the crystallization process. The complicated crystallization of tricrystalline triblock terpolymers can only be fully grasped when DSC, WAXS, and PLOM experiments are combined. This knowledge is fundamental to tailor the properties of these complex but fascinating materials.

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“…Therefore, PET has been extensively used for the manufacture of beverage bottles, packing films, engineering plastics, industrial fibers and so on [ 4 ]. As a semicrystalline polymer, the crystallization and its degree of crystallinity play an important role on applications, which would highly affect physical and mechanical properties [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Generally speaking, the introduction of other polymers, nanofillers, comonomers and reactive functional groups are commonly used technique to modify the crystallization behaviors by means of copolymerization, blending, etc.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and Thermal Behaviors of Poly(ethylene terephthalate)/Bisphenols Complexes through Melt Post-Polycondensation

et al. 2020

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Three kinds of modified poly(ethylene terephthalate) (PET) were prepared by solution blending combined with melt post-polycondensation, using 4,4′-thiodiphenol (TDP), 4,4′-oxydiphenol (ODP) and hydroquinone (HQ) as the bisphenols, respectively. The effects of TDP, ODP and HQ on melt post-polycondensation process and crystallization kinetics, melting behaviors, crystallinity and thermal stability of PET/bisphenols complexes were investigated in detail. Excellent chain growth of PET could be achieved by addition of 1 wt% bisphenols, but intrinsic viscosity of modified PET decreased with further bisphenols content. Intermolecular hydrogen bonding between carbonyl groups of PET and hydroxyl groups of bisphenols were verified by Fourier transform infrared spectroscopy. Compare to pure PET, both the crystallization rate and melting temperatures of PET/bisphenols complexes were reduced obviously, suggesting an impeded crystallization and reduced lamellar thickness. Moreover, the structural difference between TDP, ODP and HQ played an important role on crystallization kinetics. It was proposed that the crystallization rate of TDP modified PET was reduced significantly due to the larger amount of rigid benzene ring and larger polarity than that of PET with ODP or HQ. X-ray diffraction results showed that the crystalline structure of PET did not change from the incorporation of bisphenols, but crystallinity of PET decreased with increasing bisphenols content. Thermal stability of modified PET declined slightly, which was hardly affected by the molecular structure of bisphenols.

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Fractionated crystallization and fractionated melting behaviors of poly(ethylene glycol) induced by poly(lactide) stereocomplex in their block copolymers and blends

Cited by 15 publications

References 52 publications

Valorization of starch nanoparticles on microstructural and physical properties of PLA‐starch nanocomposites

Valorization of starch nanoparticles on microstructural and physical properties of PLA‐starch nanocomposites

Crystallization and Morphology of Triple Crystalline Polyethylene-b-poly(ethylene oxide)-b-poly(ε-caprolactone) PE-b-PEO-b-PCL Triblock Terpolymers

Crystallization and Thermal Behaviors of Poly(ethylene terephthalate)/Bisphenols Complexes through Melt Post-Polycondensation

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