Residual stress induced by crystallization of polymers from the melt

Malkin, A. Ya.; Begishev, V. P.; Шардаков, И. Н.; Shardin, O.A.; Bolgov, S.A.

doi:10.1016/0032-3950(87)90033-5

Cited by 3 publications

(3 citation statements)

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“…When the fiber is formed using NFES (Figure c), the polymer molecules inside the fiber experience nonhomogeneous solidification due to the gradient of thermal conduction. This results in nonuniform aggregation of molecules and the associated increase of semicrystalline anisotropy. , Then, electromagnetic refractions occur at the boundary of crystalline and amorphous domains in the fiber. Since λ 0 is less sensitive to the δ of polymer materials, the δ is assumed to be primarily a function of t fiber ,, and crystallinity ( X C ).…”

Section: Theoretical Basismentioning

confidence: 99%

“…This results in nonuniform aggregation of molecules and the associated increase of semicrystalline anisotropy. 21,22 Then, electromagnetic refractions occur at the boundary of crystalline and amorphous domains in the fiber. Since λ 0 is less sensitive to the δ of polymer materials, 23 the δ is assumed to be primarily a function of t fiber 16,24,25 and crystallinity (X C ).…”

Section: Theoretical Basismentioning

confidence: 99%

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Fiber Lithography: A Facile Lithography Platform Based on Electromagnetic Phase Modulation Using a Highly Birefringent Electrospun Fiber

Kim

Shin

Chang

2020

ACS Appl. Mater. Interfaces

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Lithography plays a key role in advancing manufacturing as well as the semiconductor industry. However, the currently available state-of-the-art lithography methods still require access to expensive tools and facilities. Herein, we suggest a novel lithography method based on electromagnetic phase modulation of ultraviolet using a highly birefringent electrospun fiber to overcome such limitations. The optical birefringent effect, by which the phase of incident ultraviolet electromagnetic fields is retarded when passing through optically anisotropic media, is combined with semicrystalline poly(ethylene oxide) (PEO)− poly(ethylene glycol) (PEG) polymeric microfibers patterned in a programmable form using near-field electrospinning. By positioning the mask between two linear polarizers that are perpendicular to each other, only the UV waves that are passing through the fibers can be selectively utilized to exhibit lithographic property. Therefore, the UV intensity on the photoresist (PR) surface follows the shape of the fiber pattern, enabling precisely controlled patterning of the photoresist. Zero-to two-dimensional key features of lithography are achieved, including straight, curved, array, and isolated patterns. Facile optical alignments without using dedicated alignment marks are successfully demonstrated, as well as various applications including micro-to macroscale serpentine, tree, and antenna circuit patterns on a flexible substrate. The presented approach, packed in a table-top scale, is expected to provide a practical and affordable lithography solution by leveraging the directwriting capability and tunable optical functionality of polymers, scalability, and the simple optical alignment method.

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Section: Theoretical Basismentioning

confidence: 99%

Section: Theoretical Basismentioning

confidence: 99%

Fiber Lithography: A Facile Lithography Platform Based on Electromagnetic Phase Modulation Using a Highly Birefringent Electrospun Fiber

Kim

Shin

Chang

2020

ACS Appl. Mater. Interfaces

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“…The heated glass dish was cooled at room temperature, and it usually takes about 15 minutes for the melt to solidify. wrinkles appeared on the membrane due to the non-uniform residual stresses generated in the crystallization process [189], that is, some parts of the membrane contracted more than the others, resulting in mild topographical distortion of the membrane.…”

Section: Step 3: Cooling a Layer Of Melt Into A Membranementioning

confidence: 99%

Engineering scaffolds for restorative tissue repair of tendon via polycaprolactone microfiber and polycaprolactone membrane

An¹

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Chua Chee Kai, for his open-minded approach, strong actions of support, and wellplanned trainings of various essential research skills. Besides, he has taught me, with great patience, how important of developing a problem solving mindset, being resourceful all the time, and communicating effectively everywhere. He is a great leader whose traits have deeply impressed and influenced me. I am also genuinely grateful to my co-supervisor, Associate Professor Leong Kah Fai, for his great patience and understanding, constant encouragement and motivation, invaluable comments and advice. His critical thoughts, sharp insights, and professional knowledge of research are absolutely impressive and substantially helpful. His mentoring is always philosophical and full of implied wisdoms, leaving a lot for the students to realize themselves and hence remember forever without fading in memory. He has always been strict outside but warm inside. I want to thank all the final year students as well,

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