The coupling effect of cellulose nanocrystal and strong shear field achieved the strength and toughness balance of Polylactide

Wu, Junjun; Gao, Ning; Jiang, Long; Zhong, Gan‐Ji; Deng, Cong; Gao, Xueqin

doi:10.1016/j.ijbiomac.2022.03.172

Cited by 16 publications

(9 citation statements)

References 22 publications

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“…It can be easily understood that the formation of hydrogen bonding interactions possibly will affect SC crystal formation, and this phenomenon can be described as follows: although CNS 3 nanocomposite has more hydrogen bonds, the effective movement of chain segments was restricted by the strong hydrogen bonds. In contrast, it is favorable for SC crystals to grow along the axial direction due to CNF 3 's high aspect ratio 47 Compared to these heat-resistant composites, our L/D/NC nanocomposites exhibit excellent crystallization ability, with the highest melting point of 220.6 °C and a crystallinity index of 33.9%. In addition, to visually determine the heat resistance of L/D/NC nanocomposites, the samples were subjected to heat treatment at 100 °C for 2 h, and then the appearance changes of the nanocomposites were observed to evaluate the heat resistance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Although nucleating agents or modification methods were conducted to improve PLA’s heat resistance, these studies could only enhance melting temperature with a low crystallinity index. For example, it can be seen in the nanocomposite system of PLA/CNF provide ( T m of 151.1, 147.1, and 140.8 °C, crystallinity index of 28.4, 44.2 and 35.9%), PLA/CNC ( T m of 169.8, 169.1 and 163.5 °C, crystallinity index of 2.3, 2.0 and 8.7%), PLLA/PDLA/NCC (nanocrystalline cellulose) ( T m of 223.0 and 215.0 °C, crystallinity index of 7.5 and 29.5%), PLLA/PDLA/CNF ( T m of 205.7, 210.3 and 209.2 °C, crystallinity index of 8.5, 11.0 and 20.5%), PLA/MFC (cellulose microfibers)/CNC ( T m of 161.0 and 157.0 °C, crystallinity index of 23.4 and 24.0%), PLA/CNC-PDLA ( T m of 165.5, 164.0 and 163.4 °C, crystallinity index of 17.5, 19.3 and 29.8%), PLLA/PDLA ( T m of 213.5, 213.8 and 214.5 °C, crystallinity index of 21.4, 23.2 and 21.8%), PLLA/CNC–rD–PDLA ( T m of 193.0, 194.0 and 195.0 °C, crystallinity index of 16.6, 23.3 and 24.1%), PLA/CNC-CIM ( T m of 169.2 and 169.3 °C, crystallinity index of 8.4 and 10.5%) . Compared to these heat-resistant composites, our l / d /NC nanocomposites exhibit excellent crystallization ability, with the highest melting point of 220.6 °C and a crystallinity index of 33.9%.…”

Section: Resultsmentioning

confidence: 99%

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Various-Sized Nanocelluloses Induced Stereocomplexes Crystallization Formation and Its Mechanism of Stereoisomers Poly(lactide acid) Blend

Xie

Abdalkarim

et al. 2023

ACS Sustainable Chem. Eng.

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This work provides evidence to explore the relationship between hydrogen bonding interactions and stereocomplex crystallization (SC) formation of nanocomposite-based nanocelluloses (NCs). Here, we evaluated the synergistic effect of various aspect ratios of NCs as nucleating agents on the properties of a poly(l-lactic acid)/poly(d-lactic acid) (l/d) stereocomplexable matrix using the casting method. Furthermore, NCs enhanced the interfacial adhesion interaction of the l/d matrix, improving crystallization ability, heat resistance, and barrier properties against the water vapor of nanocomposites. As expected, the nanocomposite with cellulose nanofibers (CNF3) had the highest SC crystallinity of 33.9% and a maximum SC melting temperature of 220.6 °C. The tensile strength of the l/d/CNF3 nanocomposite increased to 53.0 MPa due to the highest aspect ratio and rigidity of CNF, which improved interfacial hydrogen bonding interactions between CNF3 and the l/d matrix. Compared with different samples, nanocomposite with cellulose nanospheres (CNS3) had the smallest spherulite size. While nanocomposite with cellulose nanocrystals (CNC3) exhibited more efficient heterogeneous nucleation than that of CNS3 or CNF3. We demonstrated the relationship between the hydrogen-bonding interactions of l/d nanocomposites and crystallization kinetic/mechanism. This work offers a suitable strategy for selecting appropriate types of NCs as nucleating agents for designing high-performance materials for food packaging industries to solve the plastic melt processing problem.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Various-Sized Nanocelluloses Induced Stereocomplexes Crystallization Formation and Its Mechanism of Stereoisomers Poly(lactide acid) Blend

Xie

Abdalkarim

et al. 2023

ACS Sustainable Chem. Eng.

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“…Place the sample shear layer in the center of the scattering hole in the sample holder to obtain shear layer data. All SAXS modes are preprocessed to correct for the effects of background scattering, air scattering, and synchrotron beam fluctuations, they are analyzed by Fit2D software, , and the resulting data are processed by software such as Foxtro and origin to obtain a two-dimensional (2D)-SAXS image.…”

Section: Methodsmentioning

confidence: 99%

“…Cellulose nanocrystals (CNCs) are characterized by high strength, high modulus, and low cost. , As one of the alternatives to inorganic nanoparticles, CNC is widely used in the semicrystalline matrix. For example, they have been used to reinforce polylactic acid (PLA), poly-3-hydroxybutyrate- co -3-hydroxyvalerate (PHBV), polycaprolactone (PCL), polyurethane (PU),etc. Although there are many studies on the enhancement of the mechanical properties of semicrystalline polymer materials by CNC so far, previous papers have not explored the effect of CNC on the formation of crystals, especially shish–kebab crystals, in semicrystalline matrices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cellulose Nanocrystals and Hot Stretching on Shish–Kebab Structures of High-Density Polyethylene

Zhang,

Xie,

Zhong

et al. 2023

Ind. Eng. Chem. Res.

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In this study, we aimed to further enhance the properties of high-density polyethylene (HDPE) by controlling the shish−kebab structures formed during dynamic packing injection molding (DPIM) through the addition of cellulose nanocrystals (CNC) filler and hot stretching. The microstructure of HDPE and HDPE/CNC DPIM samples with and without hot stretching was analyzed using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and small-angle X-ray scattering (SAXS). The results showed that the combination of CNC and hot stretching significantly altered the crystallization behavior of HDPE. After adding CNC and applying hot stretching, the degree of orientation increased from 0.704 to 0.859, and clear interlocking shish− kebab structures were observed. The degree of crystallization increased from 57.71 to 59.28%. The synergistic effect of cellulose nanocrystals and hot stretching effectively reinforced HDPE by changing its microstructure and morphology. In comparison with HDPE DPIM samples without hot stretching, the tensile strength of HDPE/CNC after hot stretching increased from 52.45 to 88.99 MPa, and the Vicat softening temperature increased from 97.7 to 103.7 °C.

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“…As a nanoscale structure with stretching chains, CNC can induce disordered molecular chains to attach and grow into lamellae, forming a shish-kebab structure. 8 CNC possesses exceptional characteristics including high strength, elevated crystallinity, a high elastic modulus, a substantial aspect ratio, a significant specific surface area, heightened reactivity, pronounced adsorption capacity, and biodegradability. As a result, CNC serves not only as a nucleating agent to augment the crystallinity of PLA, but also exhibits considerable potential in enhancing the MP of 3D-printed articles.…”

Section: Introductionmentioning

confidence: 99%

Exploring the impact of cellulose nanocrystals and annealing treatment on the interlayer bond strength of polylactic acid 3D printed composites

Zhang,

Lu,

et al. 2023

J of Applied Polymer Sci

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The extrusion‐based 3D printing process offers advantages, such as high precision, low cost, high speed, simplicity, and the ability to deposit multiple materials simultaneously. However, using 3D printing composite materials with orthogonal anisotropy can limit the interlayer bonding strength of printed parts. In this study, the interlayer tensile strength of 3D‐printed polylactic acid (PLA) was affected by adding 0.5 wt% cellulose nanocrystals (CNC) and 1.2 wt% di‐cumyl peroxide (DCP) to PLA, and annealing at low temperature (373 K, 1 h). The effects of annealing and CNC were determined by mechanical testing, scanning electron microscopy, differential scanning calorimetry, expansion testing, rheological testing, and x‐ray diffraction analysis. After annealing, the interlayer gap increased due to crystal shrinkage, leading to a 25.9% decrease in tensile strength. However, the addition of CNC and DCP significantly improved the flow properties of the sample, resulting in better interlayer bonding and a 52.7% increase in tensile strength.

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The coupling effect of cellulose nanocrystal and strong shear field achieved the strength and toughness balance of Polylactide

Cited by 16 publications

References 22 publications

Various-Sized Nanocelluloses Induced Stereocomplexes Crystallization Formation and Its Mechanism of Stereoisomers Poly(lactide acid) Blend

Various-Sized Nanocelluloses Induced Stereocomplexes Crystallization Formation and Its Mechanism of Stereoisomers Poly(lactide acid) Blend

Effect of Cellulose Nanocrystals and Hot Stretching on Shish–Kebab Structures of High-Density Polyethylene

Exploring the impact of cellulose nanocrystals and annealing treatment on the interlayer bond strength of polylactic acid 3D printed composites

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