The preparation of chain branching PLLA by intermolecular hydrogen bonding with 3-Pentadecylphenol and its crystallization, relaxation behavior and thermal stability

Sun, Xiaolei; Luo, Fa; Yan, Dongguang

doi:10.1007/s10965-019-1729-1

Cited by 8 publications

(10 citation statements)

References 35 publications

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“…However, bulk PDP showed partially overlapping double melting peaks at 49.26 and 53.49 °C, which is very common in the melting processes of semicrystalline polymers. 55 This phenomenon proved that the crystallization of PDP is more similar to that of semicrystalline polymers, so the simulation of the confined crystallization of semicrystalline polymers by PDP is more realistic than that of n-alkanes. Figure 4d shows the melting curves of bulk C 15 and 450 nm AAO-C 15 .…”

Section: Resultsmentioning

confidence: 86%

“…The values T m of the AAO-PDP samples were approximately the same, which was independent of the nanopore sizes, indicating that there was only one crystal type in AAO-PDP when the crystallization was completed, and the stability and grain size of the crystal were basically unchanged. However, bulk PDP showed partially overlapping double melting peaks at 49.26 and 53.49 °C, which is very common in the melting processes of semicrystalline polymers . This phenomenon proved that the crystallization of PDP is more similar to that of semicrystalline polymers, so the simulation of the confined crystallization of semicrystalline polymers by PDP is more realistic than that of n -alkanes.…”

Section: Resultsmentioning

confidence: 91%

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Confined Crystallization and Melting Behaviors of 3-Pentadecylphenol in Anodic Alumina Oxide Nanopores

Liu

Yao

et al. 2021

ACS Omega

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To explore the effects of end groups on the confined crystallization of an alkyl chain, 3-pentadecylphenol (PDP) was infiltrated into the anodic aluminum oxide template (AAO) to investigate the melting and crystallization behaviors of PDP in a nanoconfined environment. Wide-angle X-ray diffraction (WAXD) found that the solid–solid phase transition of PDP occurred under confined conditions, and the absence of the (00L) reflections indicated that the stacking of the end groups of the alkyl chain layered structure was seriously disturbed. Thermal analysis (TG) showed that the thermal stability of the confined samples decreased due to the confinement effect, and the introduction of end groups made the confinement effect more obvious. Differential scanning calorimeter (DSC) results well reflected the space–time equivalence in the PDP crystallization processes, i.e., the solid–solid phase transition can be achieved by reducing the cooling rate or confining PDP in the nanometer space. Compared with C15, the introduction of the end groups with a phenol ring led to the disappearance of the solid–solid phase transition of an alkyl chain at high cooling rates. In the confined environment, the introduction of the end groups with a phenol ring caused the melting double peaks of the alkyl chain to become a single melting peak, and it also caused the disappearance of the surface freezing monolayer for alkyl chains. Through the analysis of crystallinity, it was found that AAO-PDP was more sensitive to AAO pore size changes than AAO-C15, the X c of AAO-PDP had a good linear relationship with the pore size d, but the X c of the AAO-C15 had a nonlinear relationship with the pore size d. Attenuated total reflection (ATR)-IR proved that in the confined environment, the order of the alkyl chain decreased and the degree of chain distortion increased.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 91%

Confined Crystallization and Melting Behaviors of 3-Pentadecylphenol in Anodic Alumina Oxide Nanopores

Liu

Yao

et al. 2021

ACS Omega

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“…The crystal interplanar spacing can be calculated according to Bragg equation (as shown in Eq. 6) [49].…”

Section: Isothermal Crystallization Kineticsmentioning

confidence: 99%

A novel blend material to improve the crystallization and mechanical properties of poly (ethylene terephthalate)

Wang

Luo

2019

J Polym Res

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To resolve the problems of phase separation in the process of toughness improvement for poly (ethylene terephthalate) (PET) by blending rubber phase, referencing the technology of interpenetrating polymer network (IPN) hindering phase separation, here a solution of phase separation restraining was developed in the process of adding thermoplastic polyester-ether elastomer (TPEE) to improve the toughness of PET by using nucleation agent bicyclo[2.2.1]heptane-2,3-dicarboxylic acid disodium salt (HPN-68 L) to enhance greatly gelation temperature to hinder the melt movement under the high temperature. It was found that TPEE and HPN-68 L could improve the crystallization rate and toughness of PET at the same time. The long period of PET increased after adding HPN-68 L and TPEE, while the crystal form of PET had a negligible effect. In addition, the spherulites arranged more closely and the size was more uniform after adding the nucleator HPN-68 L into PET/TPEE blends. In mechanical properties testing, with increasing the TPEE content, the flexural strength and flexural modulus of PET/TPEE/HPN-68 L blends were decreased, but the toughness of the blends was greatly improved. Especially, no distinct phase separation was observed and the tissue morphology of the blends was very uniform.

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“…Moreover, small molecules can obviously enhance impact strength as a result of plasticization effect 24 . In our previous work, PDP was utilized to toughen PLA by establishing intermolecular H‐bonding interaction 25 . Ge et al 23 selected PDP to obviously enhance the toughness of phenolic resin.…”

Section: Introductionmentioning

confidence: 99%

“…24 In our previous work, PDP was utilized to toughen PLA by establishing intermolecular H-bonding interaction. 25 Ge et al 23 selected PDP to obviously enhance the toughness of phenolic resin. To the best knowledge of authors, limited investigation has been reported about the effect of Hbonding formation between PA6,12 and small molecules and its consequence on their crystalline structure and resultant toughness enhancement.…”

Section: Introductionmentioning

confidence: 99%

Toughness enhancement of polyamide 6,12 with intermolecular hydrogen bonding with 3‐pentadecylphenol

Jalali

Yao

et al. 2022

J of Applied Polymer Sci

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Due to the brittle performance of polyamide 6,12 (PA6,12) in high impact environment, we report a facile, efficient, and scalable method to toughen PA6,12 by establishing intermolecular hydrogen bonding (H‐bonding) interaction with 3‐pentadecylphenol (PDP). Interestingly, the intermolecular H‐bonding interaction obviously hindered PA crystallization, which was evidenced by decrease of crystalline temperature from 186.8 to 175.8°C and prolong of crystallization half‐time from 0.27 to 0.37 min, when the amount of PDP was increased to 30 wt%. Consequently, the toughness of the PA6,12/PDP composites containing 30 wt% PDP was improved and their notched impact strength reached to 17.5 kJ m−2, about three times higher than that of the neat PA6,12. It was deduced that both plasticizing effect and intermolecular H‐bonding interaction played critical roles in PA6,12 resultant composites toughness, which opens a new perspective of PA6,12 toughening for a wide range of applications.

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The preparation of chain branching PLLA by intermolecular hydrogen bonding with 3-Pentadecylphenol and its crystallization, relaxation behavior and thermal stability

Cited by 8 publications

References 35 publications

Confined Crystallization and Melting Behaviors of 3-Pentadecylphenol in Anodic Alumina Oxide Nanopores

Confined Crystallization and Melting Behaviors of 3-Pentadecylphenol in Anodic Alumina Oxide Nanopores

A novel blend material to improve the crystallization and mechanical properties of poly (ethylene terephthalate)

Toughness enhancement of polyamide 6,12 with intermolecular hydrogen bonding with 3‐pentadecylphenol

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