Synchronous toughening and strengthening of the immiscible polylactic acid/thermoplastic polyurethane (PLLA/TPU) blends via the interfacial compatibilization with Janus nanosheets

In situ microfibrillar poly(lactic acid) (PLA)/polyolefin elastomer (POE) composites (MFCs) with and without compatibilizer POE‐g‐GMA were prepared using a multistage stretching equipment. The results showed that the distribution of PLA inside the POE matrix for the MFCs without compatibilizer was in the form of microfibrils, and most of the PLA microfibrils were well‐oriented and arranged in the matrix. Further, the high PLA content was more likely to form longer PLA microfibrils in MFCs. With the increase in the amount of POE‐g‐GMA for (PLA/POE, 20/80) system, the length of PLA microfibrils significantly decreased, whereas the average diameter increased. The addition of 2 wt% POE‐g‐GMA increased the tensile strength and elongation at the break of POE‐20‐2 by 52.7% and 53.5%, respectively, and the crystallization temperature increased by about 4°C.

Section: Micromorphological Analysis Of Mfcsmentioning

confidence: 97%

Enhancement in the mechanical properties of in situ microfibrillar PLA/POE composites

Sun,

Li,

Huang

et al. 2023

“…33 The peak at 1496 cm À1 is attributed to C=C stretching of benzenoid rings. 18 In addition, the appearance peaks at 1300 and 1238 cm À1 are assigned to the C-N stretching of quinoid rings, while the peaks at 1138 and 801 cm À1 are corresponded to the aromatic C-H in-plane bending and the out-of-plane deformation of C-H. 27,34,35 Figure 2e,f show the TG and DTG curves of JNSs and PANI@JNSs. JNSs contain three weight loss stages at about 25-116 C, 116-265 C and 265-575 C, which are respectively corresponded to the removal of free water, the elimination of bonding water and the decomposition of organic groups as amino group, carbonyl groups, double bonds and saturated alkyl groups.…”

Section: Morphology and Chemical Composition Of Jnss And Pani@jnssmentioning

confidence: 99%

“…The Janus nanosheets are more commonly used in polymer blending because it exhibits high activity in capturing non-equilibrium intermediate states. 27,28 Attributing to its 2D structure, the Janus nanosheets are more effective in reducing the free energy of the system and inhibiting phase separation than Janus particles, which plays the role of compatibilization, strengthening and toughening in the process of polymer blending. However, to the best of our knowledge there have been no reports on the composites of Janus nanosheets and polymer coating used in anticorrosion.…”

Section: Introductionmentioning

confidence: 99%

Barrier and passivation effects of 2D PANI@JNSs Janus nanosheets in epoxy anticorrosion coating

Zheng

Chi

Chen

et al. 2023

The filled sheet‐like inorganic materials can usually improve the anticorrosion performance of the coating. Herein, the Janus nanosheets (JNSs) with two‐dimensional structure were prepared by phase separation method, modified by polyaniline (PANI) on the amino side of JNSs and composited with epoxy resin (EP). Scanning electron microscope (SEM), transmission electron microscopy (TEM), atomic force microscope (AFM), Fourier transform infrared spectroscopy (FT‐IR), thermogravimetry (TG) were used to characterize the morphology and chemical structure of JNSs and PANI@JNSs. The anti‐corrosion performance of coatings was measured by electrochemical impedance spectroscopy (EIS) and salt spray experiment. Compared with pure EP, the |Z|0.01Hz of 0.5%‐JNSs/EP coating and that of 0.5%‐PANI@JNSs/EP coating reached 5.6 × 108 and 5.4× 1010 Ω·cm2 after immersed for 35 days, nearly 2 and 4 orders of magnitude higher than pure EP respectively. The excellent anti‐corrosion performance of 0.5%‐PANI@JNSs/EP coating is due to the synergistic effect of physical barrier effect of PANI@JNSs, interfacial interaction between PANI@JNSs and epoxy resin and passivation effect of PANI. Moreover, PANI@JNSs possess both strengthening and toughening effects on composite coating. Janus nanosheets provide a new idea and method for preparing high‐performance anticorrosive materials.

“…The results indicate that the introduction of OH or PLA chains on BNNS enhances the toughness of PLA. In another study, Guan et al 15 synthesized functionalized Janus nanosheets (JNSs) by grafting PU chains and epoxide groups onto opposite sides of silica nanosheets. This modification significantly increased the elongation at the break of PLA/TPU blends from 31.4% to 362.6%.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dielectric and mechanical properties of polylactic acid/polycaprolactone blends by introducing double‐layer carbon nanofillers

Tu,

Chu,

Gao

et al. 2023

To overcome the issues of poor toughness and low dielectric constant associated with PLA, which limit its application in the electronics industry, we introduced an insulating polydopamine (PDA) layer on the surface of core‐shell nickel‐coated carbon nanotube (Ni‐CNT) and nickel‐coated graphene (Ni‐GRA). Through a double‐layer structural design approach, we successfully prepared polylactic acid (PLA)/polycaprolactone (PCL) blends that exhibit high dielectric constant (ε’) and low dielectric loss (tanδ). This innovative design led to impressive impact strengths of 29.41 kJ/m2 for PLA/PCL/4Ni‐GRAs and 22.54 kJ/m2 for PLA/PCL/4Ni‐CNTs. PDA enhanced the interfacial interactions between the filler and matrix, which improved the dispersion of Ni‐CNTs and Ni‐GRAs and contributed to the mechanical properties of the PLA/PCL blends. Simultaneously, PLA/PCL/4Ni‐CNTs and PLA/PCL/4Ni‐GRAs exhibited commendable integrated dielectric properties. The PDA@fillers form microcapacitors with the polymer matrix and the conductive Ni layer enhances ε’ and reduces the conductivity difference between fillers. Furthermore, the insulating PDA layer contributed to improved dispersion, inhibition of charge carrier migration, and reduction in tanδ. At 1000 Hz, the ε′ of PLA/PCL/4Ni‐CNTs and PLA/PCL/4Ni‐GRAs increased to 88.3 and 124.6, respectively, and the tanδ values remained below 1, indicating minimal dielectric loss. This provides a promising direction for eco‐friendly materials with enhanced dielectric and mechanical properties.