Development and industrialization of a biaxially stretched nano-alloyed film

Abstract

The novel concept and significance of a nano-alloyed polymer, which includes nano-dispersed domains, is proposed, and a biaxially stretched nano-alloyed film is developed. The developed film has a higher glass transition temperature and improved dimensional stability compared with regular poly(ethylene terephthalate) (PET) films. Nano-sized polyimide domains are dispersed with our original melting extrusion process, which produces highly concentrated polyimide master batches at much lower temperatures than the regular processing temperature of the polyimide. The biaxially stretched film has been industrialized for use as a substrate for data storage tapes and can additionally be applied to materials in the fields of electronic devices, automobile, environmental and energy devices. Polymer Journal (2012) 44, 1170-1178; doi:10.1038/pj.2012.96; published online 13 June 2012Keywords: biaxially stretched film; glass transition temperature; nano alloy; nanostructure control technology; polyester; polyimide INTRODUCTION Development of a biaxially stretched nano-alloyed film Biaxially stretched polyester films, which are represented by poly (ethylene terephthalate) (PET) films, are currently the most widely used polymeric substrate materials in the fields of display technologies, electronic devices, storage media, electronic insulators, automobile, molding, package, printing and architecture. This widespread use is a result of the films possessing high strength, durability, transparency, flexibility and good surface properties. Information and telecommunications equipment have recently required more compactness and portability as well as excellent film properties, such as higher heat resistance and dimensional stability, especially in the field of electronics, environment and energy. It has been difficult for conventional biaxially stretched PET films to meet the future demand, and outstanding films with cost effectiveness are required.We have created a biaxially stretched nano-alloyed PET film that has a higher glass transition temperature, which is an intrinsic property of polymers, compared with regular biaxially stretched PET films. 1 The technical points from our development are the following. First, the novel concept and significance of nano-alloyed polymers have been proposed. Secondly, nanostructure control technology has been developed for the nano-sized dispersion of polyimide, which is a different organic polymeric material than polyester. Finally, the processing conditions for the biaxially stretched nano-alloyed films have been established. In this paper, we describe the design of a nano-alloyed polymer and biaxially stretched films.

Waterproof and Breathable Electrospun Nanofibrous Membranes

“…Reproduced with permission. [25] Copyright 2012, The Society of Polymer Science. c) Electrospinning.…”

“…Various processing techniques (e.g., casting technology, biaxial stretching, and electrospinning) have been developed to fabricate W&B membranes ( Figure ) . Casting technology needs high energy consumption and the obtained W&B membranes generally show poor breathability.…”

“…[23] Various processing techniques (e.g., casting technology, biaxial stretching, and electrospinning) have been developed to fabricate W&B membranes (Figure 1). [24][25][26] Casting technology needs high energy consumption and the obtained W&B membranes generally show poor breathability. Moreover, biaxial stretching suffers from high cost and severe limitations to material sources for W&B membranes.…”

PET/Graphene Compatibilization for Different Aspect Ratio Graphenes via Trimellitic Anhydride Functionalization

“…Poly­(ethylene terephthalate) (PET) is a high-performing semicrystalline thermoplastic with elevated glass transition temperature ( T g ), mechanical properties, chemical resistance, and moldability, making it a good candidate for commercial usage in bottles, cartridge, textile fibers, and films. , The processing for PET pellets typically involves extrusion as sheets, after which tentering, post- T g annealing, and other processing techniques are carried out. − Finally, depending on the application of interest, the processed polymer may be postprocessed into the desired shape via automated techniques such as cutting, coating, laminating, and molding.…”

Structural Evolution of Two-Phase Blends of Polycarbonate and PMMA by Simultaneous Biaxial Stretching

“…Biaxially stretched polymer films are often used as packaging materials for food and industrial products, because the mechanical and gas barrier properties can be improved using biaxial stretching in the manufacturing process [1]. Many researchers have investigated how the structures of polymer films obtained by biaxial stretching vary in a number of aspects [2,3] for crystalline polymers [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27], polymer blends [28,29,30,31,32,33,34] and composites [35,36,37]. The dimensional stability is enhanced due to the increase in the degree of the stress-induced crystallinity [4], surface morphology is changed [5,6], hardness is enhanced [7], and high toughness polylactide film can be obtained by development of highly-oriented small crystallites [8] in the crystalline polymers.…”