Molecular orientation angle of biaxially stretched poly(ethylene terephthalate) films

Kim, GeunHyung; Kang, Chang-Kwon; Chang, Cheol Gyu; Ihm, Dae Woo

doi:10.1016/s0014-3057(97)00053-0

Cited by 21 publications

(10 citation statements)

References 28 publications

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“…If the scaffold cannot provide adequate mechanical support, then emerging tissue formation will fail [11]. In these systems, the elastic modulus is closely associated with the molecular orientation of the polymer because of the formation of supramolecular structures made up of oriented polymer chain fragments [25, 26]. Figure 4a shows stress–strain curves for PCL strands fabricated at various PZT frequencies and a nozzle speed of 7 mm/s.…”

Section: Resultsmentioning

confidence: 99%

Improvement of mechanical properties of polycaprolactone scaffolds by applying piezoelectric vibration system based on a dispensing process: A new concept

Kang

Yoon

Kim

2010

Polymer Engineering & Sci

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The mechanical properties of biomedical scaffolds are important for applications in tissue regeneration. The dispensing system described herein, which is based on a solid free‐form fabrication technique, enables the production of design‐based scaffolds with controllable pore structures. Although current plotting systems can easily fabricate a variety of three‐dimensional scaffolds, the mechanical properties of these constructs are difficult to control because of low processing speed. To overcome this limitation, a new dispensing method, which uses a piezoelectric vibration system to improve mechanical properties, has been developed. Polycaprolactone (PCL) strands fabricated using this technique were roughly 70% stronger than normal PCL strands. To explain this increase in mechanical strength, the combined effects of the piezoelectric system and the melt‐dispensing process on the crystalline morphology and molecular orientation of PCL strands were investigated. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Improvement of mechanical properties of polycaprolactone scaffolds by applying piezoelectric vibration system based on a dispensing process: A new concept

Kang

Yoon

Kim

2010

Polymer Engineering & Sci

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“…A key aspect is the ability to effectively process the nanocomposites [47]. Research builds on a strong legacy of international research into the drawing (or extrusion) of the polymer, polyethylene terephthalate [48][49][50][51][52][53][54].…”

Section: Lightermentioning

confidence: 99%

Smarter–lighter–greener: research innovations for the automotive sector

Bhattacharyya

2015

Proc. R. Soc. A.

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This paper reviews the changing nature of research underpinning the revolution in the automotive sector. Legislation controlling vehicle emissions has brought urgency to research, so we are now noticing a more rapid development of new technologies than at any time in the past century. The lightweighting of structures, the refinement of advanced propulsion systems, the advent of new smart materials, and greater in-vehicle intelligence and connectivity with transport infrastructure all require a fundamental rethink of established technologies used for many decades-defining a range of new multi-disciplinary research challenges. While meeting escalating emission penalties, cars must also fulfil the human desire for speed, reliability, beauty, refinement and elegance, qualities that mark out the truly great automobile.

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“…Many studies are available in the scientific literature on planar and biaxial stretching of PET films for the development of products with highly ordered structure [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], and products of stretched films have been used in many applications, such as packaging sheets [ 19 , 22 , 24 , 27 ]. For PET fiber webs, there is a possibility of widening applications, such as packaging and battery separator materials, by applying the stretching process because of their superior mechanical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Planar or Biaxial Stretching of Poly(ethylene terephthalate) Fiber Webs Prepared by Laser-Electrospinning

et al. 2022

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In this work, laser-heated electrospinning (LES) process using carbon dioxide laser was explored as an eco-friendly method for producing ultrafine fibers. To enhance the thinning of fibers and the formation of fiber structure, planar or equibiaxial stretching and subsequent annealing processes were applied to poly(ethylene terephthalate) (PET) fiber webs prepared by LES. The structure and properties of the obtained webs were investigated. Ultrafine fiber webs with an average diameter of approximately 1 μm and a coefficient of variation of 20–25% were obtained when the stretch ratios in the MD (machine direction) × TD (transverse direction) were 3 × 1 and 3 × 3 for the planar and equibiaxial stretching, respectively. In the wide-angle X-ray diffraction analysis of the web samples, preferential orientation of crystalline c-axis were confirmed along the MD for planar stretching and only along the web plane for equibiaxial stretching, which was in contrast to the stretching of film samples, where additional preferential orientation of benzene ring along the film plane proceeded. The results obtained suggest that PET fiber webs fabricated through LES and subsequent planar or biaxial stretching processes have potential for a wide variety of applications, such as packaging and battery separator materials.

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Molecular orientation angle of biaxially stretched poly(ethylene terephthalate) films

Cited by 21 publications

References 28 publications

Improvement of mechanical properties of polycaprolactone scaffolds by applying piezoelectric vibration system based on a dispensing process: A new concept

Improvement of mechanical properties of polycaprolactone scaffolds by applying piezoelectric vibration system based on a dispensing process: A new concept

Smarter–lighter–greener: research innovations for the automotive sector

Planar or Biaxial Stretching of Poly(ethylene terephthalate) Fiber Webs Prepared by Laser-Electrospinning

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