Simultaneously improving stiffness, toughness, and heat deflection resistance of polylactide using the strategy of orientation crystallization amplified by interfacial interactions

Sang, Zi‐Hong; Chen, Yuan; Li, Yue; Xu, Ling; Lei, Jun; Zheng, Yan; Zhong, Gan‐Ji; Li, Zhong‐Ming

doi:10.1002/pcr2.10004

Cited by 10 publications

(4 citation statements)

References 46 publications

(73 reference statements)

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“…It is well documented that the mechanical properties of polymers depend on their structure and morphology . To show the influence of illite on the mechanical properties of the iPP matrix, tensile test of iPP and its composites with different illite has be performed.…”

Section: Resultsmentioning

confidence: 99%

The influence of illite on the crystallization and properties of isotactic polypropylene

Song

Sun

et al. 2019

Polymer Crystallization

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The iPP/illite composites with varied content of illite were prepared and the influence of illite on the crystallization kinetics, crystalline morphology, and mechanical property of iPP was investigated. It is found that the illite exhibits obvious nucleation ability toward iPP in its α‐form. A 1 wt% of illite leads to an increment of iPP crystallinity from 33% to 50%. Moreover, the crystallization of iPP has been accelerated remarkably. Tensile test shows that the addition of illite also improves the mechanical properties of iPP. A 1 wt% illite leads to an enhancement of modulus of iPP from 1.4 GPa to 1.9 GPa, whereas the tensile strength increases from 30.5 to 37.1 MPa. The above‐mentioned influence of illite on the iPP depends on its content. This has been correlated to the aggregation of illite in the iPP matrix with increasing amount, which reduces the aspect ratio and specific surface area of illite.

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Section: Resultsmentioning

confidence: 99%

The influence of illite on the crystallization and properties of isotactic polypropylene

Song

Sun

et al. 2019

Polymer Crystallization

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“…Semicrystalline polymers account for more than two-thirds of the global applications of polymeric materials and the material properties of which are directly related to their crystalline morphology. − Polymer crystallization is the fundamental and governing process of structure formation ranging from atomistic to macroscopic scales. By changing crystallization conditions, polymers can exhibit different amounts, orientations, and interconnectivities of crystallites, which affect their mechanical, thermal, and electrical properties. − Understanding polymer crystallization and the resulting morphologies under different processing conditions is thus the key to designing and manufacturing high-performance polymer products with desired properties. − However, the crystallization mechanism is still one of the major unresolved problems of polymer science, even after several decades of in-depth studies. − …”

Section: Introductionmentioning

confidence: 99%

Nucleation and Crystallization of Polymer Melts under Cyclic Stretching: Entanglement Effect

Zhu

Zhao

2023

Macromolecules

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It is well known that the local orientation order plays a key role in stretch-induced nucleation and crystal growth of polymer melts, where a competition between chain orientation and dynamics of entangled polymer chains must exist. However, it remains unclear how much the topological entanglements affect the crystallization of polymer melts when the local order remains approximately unchanged. In this study, the influence mechanism of entanglements on the crystallization of polymer melts under cyclic stretching is revealed using molecular dynamics simulations and primitive path analysis. Polymer systems with different entanglement densities and similar local order are constructed by cyclic stretching, which can be used to figure out the contribution of the entanglement effect to the polymer nucleation and crystal growth. The current results show that the polymer melts prefer to nucleate in the less-entangled regions. The polymer nucleation rate and crystal growth rate decrease exponentially and linearly with increasing entanglement density, respectively. The lower entanglement density holds the shorter nucleation time and eventually leads to the smaller average size of crystalline clusters and more crystalline regions. This study provides a physical insight to understand the cyclic-stretch-induced nucleation and crystal growth that involves the topological restriction of entanglements.

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“…However, due to the semirigid molecular backbone, the crystallisation rate of PLLA and PDLA is rather slow. This results in an amorphous product after injection moulding [4], as the modulus greatly drops above the glass transition temperature (T g ≈ 55 • C) [5].…”

Section: Introductionmentioning

confidence: 99%

Development of High Temperature Resistant Stereocomplex PLA for Injection Moulding

2022

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In this study, the production of stereocomplex PLA formulations (sc-PLA) by compounding and subsequent injection moulding at different mould temperatures was investigated. Several selective nucleating agents were identified and compounded with different poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) ratios on a co-rotating twin screw extruder. The effect of nucleating agents (NA) on the crystallisation behaviour of the compound was systematically investigated by DSC analysis. The crystallisation behaviour of NA-21 (aluminium complex of a phosphoric ester), also in combination with talc, under cooling rates of up to 70 K/min was analysed. The wide-angle X-ray diffraction (WAXD) results showed a complete stereocomplex (sc) crystal formation on all specimens containing NA-21 even at the highest cooling rates. The thermo-mechanical testing of sc-PLA shows a Young’s modulus of approx. 3 GPa, yield stress of 30–40 MPa, elongation of 1%, and a heat deflection temperature (HDT-B) up to 180 °C. Processing sc-PLA exclusively via the processing route of compounding and injection moulding will open new areas of application for PLA at higher temperatures.

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Simultaneously improving stiffness, toughness, and heat deflection resistance of polylactide using the strategy of orientation crystallization amplified by interfacial interactions

Cited by 10 publications

References 46 publications

The influence of illite on the crystallization and properties of isotactic polypropylene

The influence of illite on the crystallization and properties of isotactic polypropylene

Nucleation and Crystallization of Polymer Melts under Cyclic Stretching: Entanglement Effect

Development of High Temperature Resistant Stereocomplex PLA for Injection Moulding

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