Optimization of amphiphobic structural surface thickness in relation to its functionality on stainless steel plates

Yuan, Weihao; Su, Cheng‐Kuan; Lei, Chien‐Ming; Mou, Chun-Yueh

doi:10.1002/app.41003

Cited by 4 publications

(2 citation statements)

References 58 publications

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“…The PLLA powder was fully filled in an aluminum container with an inner diameter of 24 mm and a depth of 3 mm. The details of the sample assembly and the pressure and temperature calibrations were the same as those described in previous article . After loading the sample, low pressure (0.1 MPa) was applied, and the temperature was raised to a predetermined level.…”

Section: Methodsmentioning

confidence: 99%

“…This can be observed by time‐resolved synchrotron small‐angle X‐ray scattering (SAXS). Our group researched the cold crystallization behavior of amorphous PLLA under high pressure and found that the α ′ crystal was formed at a limited temperature and pressure range . Recently, Ru et al utilized a homemade pressuring and shearing device to study the crystalline morphology and structure of PLLA under the coexistence of shear and pressure; they obtained almost an exclusive β ‐form directly from the PLLA melt crystallization .…”

Section: Introductionmentioning

confidence: 99%

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Isothermally crystallization behavior of poly (L‐lactide) from melt under high pressure

Yuan

Yang

et al. 2018

Polymers for Advanced Techs

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The poly (L-lactide) (PLLA) samples from melt were isothermally crystallized at 175°C and 190°C under pressures (P C ) ranging from 0.1 to 400 MPa. The crystalline structures and thermal properties were investigated by using wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). On the basis of the DSC and WAXD results, it is confirmed that an α crystal was formed in the low-pressure region (P C ≤ 50 MPa), and the disordered α crystal (α′) was formed in the medium-pressure region (100 MPa ≤ P C ≤ 200 MPa) for the PLLA samples isothermally crystallized at 175°C. However, the only α crystal was formed in the pressure range from 0.1 to 200 MPa, and no α′ crystal could be found in the PLLA samples isothermally crystallized at 190°C. Interestingly, the full amorphous PLLA was obtained at 175°C and 190°C, when the P C was above 250 MPa. There seems to exist a cut-off pressure for the crystallization of PLLA, which divides the pressure into high and low regions.The peculiarities of crystalline structure could be explained by the enhanced melt supercooling and the confined crystallization behaviors of PLLA under high pressure.The effect of the compression rate on the formation of amorphous PLLA was also researched with different compression rates. The results indicate that the molten PLLA could be easy to solidify as full amorphous phase under the higher pressure at a lower critical compression rate. KEYWORDS high pressure, isothermally crystallization, melt, PLLA | INTRODUCTIONWith the development of polymer science, plastics bring us civilized conveniences. However, a large amount of waste plastics have been a serious environmental problem. We live in the plastic age (the "plasticene"), producing over 300 million tons (mt) of plastic every year globally, 5 to 15 mt of which flow into already polluted oceans. 1 Poly (L-lactide) (PLLA) has received much attention over the past few decades, because it is renewable, nontoxic, biodegradable, and biocompatible. [2][3][4] Furthermore, PLLA has unique properties, such as high modulus, high strength, and good clarity. Therefore, it has been widely applied in the fields of packing textile, and tissue engineering, making it one of the most potential alternatives for petroleum-based commodity polymers. 5,6 Due to its limited application because of its brittleness at room temperature, PLLA is usually blended with plasticizers to modify the brittle behavior for improving the application performance. 7,8 In contrast with the aforementioned approaches, regulating the crystalline structure and morphology of PLLA through controlling crystallization conditions can also effectively improve its impact resistance but can avoid aforementioned problems.Poly (L-lactide) is known to form three kinds of crystal modification, namely, the α, 9 β, 10 and γ 11 forms, along with a new α crystal modification, named the α′ form. 12 The resulting formation of crystal structure depends on various processing conditions, including temperature, shearing, and stretching. The most co...

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isothermally crystallization behavior of poly (L‐lactide) from melt under high pressure

Yuan

Yang

et al. 2018

Polymers for Advanced Techs

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Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties

Chen

Zhang

et al. 2014

J of Applied Polymer Sci

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A series of amine-terminated and anhydride-terminated hyperbranched polyimides (HBPIs) were successfully prepared with various commercial dianhydrides and a novel BB 0 2 -type aromatic triamine, 2,4,6-tris[4-(4-aminophenoxy)phenyl]pyridine, with a symmetrical triaryl-substituted pyridine segment and prolonged flexible linkages. The chemical structure of the triamine monomer and the hyperbranched structure of the resulting polymers were verified by Fourier transform infrared spectroscopy and 1 H-NMR spectroscopy. The resulting HBPIs, which mainly held an amorphous morphology, exhibited improved organosolubilities in several strong polar aprotic solvents, good heat resistance with glass-transition temperature values in the range 218.6-311.0 C, and excellent thermal stabilities in both N 2 and air [the temperature at 5% weight loss (T 5% ) in N 2 was higher than 529.8 C and the T 5% in air was higher than 465.1 C]. The obtained HBPI films also showed outstanding mechanical properties with tensile strength, tensile modulus, and elongation at break values of 86.4-101.3 MPa, 1.73-2.04 GPa, and 5.07-10.67%, respectively; considerable optical transparency; low water absorption; and neutral interface wettability.

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Styrene/isoprene/butadiene integrated rubber prepared by anionic bulk polymerization in a twin‐screw extruder

Yuan

Wang

Shan

et al. 2014

Polymer Engineering & Sci

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Styrene/isoprene/butadiene integrated rubber (SIBR) was synthesized using anionic bulk polymerization in a corotating intermeshing twin‐screw extruder. In order to study the relationship between microstructure and physical properties, three SIBRs were synthesized using different initiator complexes: n‐BuLi (N‐butyl lithium), n‐BuLi/THF (tetrahydrofuran), and n‐BuLi/TMEDA (tetramethylethylenediamine). The microstructure of the rubber products was analyzed by gel permeation chromatography and H nuclear magnetic resonance. SIBR prepared with pure n‐BuLi exhibited a multiblock microstructure. With the addition of THF or TMEDA, the vinyl content of the alkadiene increased; and the microstructure of SIBRs was randomized, indicated by the presence of a high weight content of styrene microblocks. Transmission electron microscopy demonstrated similar morphology in both the SIBRs and SSBR2003 (an industrial product). Dynamic mechanical analysis of the vulcanized SIBRs showed that the randomized SIBRs were quite suitable for the preparation of high‐performance tires. Tensile and tear test results of SIBRs were equivalent to those of SSBR2003. The low manufacturing cost of reactive extrusion technology will allow the large‐scale industrialization of SIBRs. POLYM. ENG. SCI., 55:1163–1169, 2015. © 2014 Society of Plastics Engineers

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Optimization of amphiphobic structural surface thickness in relation to its functionality on stainless steel plates

Cited by 4 publications

References 58 publications

Isothermally crystallization behavior of poly (L‐lactide) from melt under high pressure

Isothermally crystallization behavior of poly (L‐lactide) from melt under high pressure

Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties

Styrene/isoprene/butadiene integrated rubber prepared by anionic bulk polymerization in a twin‐screw extruder

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