Abstract:A heat‐shrinkable multilayer film is widely employed as labels of plastic bottles. A new heat‐shrinkable multilayer film without an adhesive layer was designed in this study. The interfacial adhesive strength between the layers was controlled to avoid layer separation. We assumed a polyethylene terephthalate glycol‐modified (PETG)/styrene‐co‐butadiene block copolymer/PETG shrinkable film substitute as the general poly(ethylene terephthalate) (PET)/polystyrene/PET shrinkable film. The interlayer adhesive streng… Show more
“…The orientation modification of the lamellar structure of SBC agreed well with the reported results. 30 Figure 4.Small angle X-ray scattering images in the (a) ND incident and (b) machine-direction incident of the coextrusion film, and (c) Small angle X-ray scattering 1-D profiles on the equatorial direction of each image.…”
Section: Resultsmentioning
confidence: 99%
“…To improve the bond strength between the SBC and the PETG, a PB homopolymer with a number average molecular weight of 5000-40,000 was added into the SBC during the manufacturing process. 30…”
Section: Heat-bonded Film Preparationmentioning
confidence: 99%
“…Note that, unlike PET, PETG stays substantially amorphous under almost all technologically relevant processing conditions. We have already reported the relationship between the adhesive properties in PETG/SBC/PETG coextruded multilayer film 30 and determined that the presence of an excessive low molecular weight polybutadiene (PB) caused segregation at the laminate interface. The segregated PB worked as an adhesive component.…”
mentioning
confidence: 99%
“…The segregated PB worked as an adhesive component. 30 This study investigates the relationship between the adhesive properties and the microphase separation of SBC component in a PETG/SBS/PETG multilayer film during thermal bonding. In addition, we analyzed the changes in the adhesive strength when a coextruded PETG/SBC/PETG multilayer film was subjected to heat and pressure.…”
This study focuses on controlling the interfacial adhesive strength between heat-sealed styrene-co-butadiene block copolymer (SBC) and glycol-modified polyethylene terephthalate (PETG) multilayer films. In comparison, the interfacial bond strength of coextruded PETG/SBC/PETG films was weaker. The lamella structures of SBC and free polybutadiene increased the interfacial adhesive strength. The coextruded films with applied thermal pressing were also examined. When exposed to heat, the interfacial adhesive strength improved. The butadiene layer segregated along the adhesive interface, as observed by transmission electron microscopy. The butadiene layer improved the interfacial adhesive strength. The applied pressure caused the butadiene layer to segregate in a parallel manner along the adhesive interface. The developed lamellar structure did not increase adhesive strength. We considered that the adhesive strength decreased due to a thinner butadiene layer with higher pressure. We concluded that adhesive segregation along the adhesive interface improved the bond strength.
“…The orientation modification of the lamellar structure of SBC agreed well with the reported results. 30 Figure 4.Small angle X-ray scattering images in the (a) ND incident and (b) machine-direction incident of the coextrusion film, and (c) Small angle X-ray scattering 1-D profiles on the equatorial direction of each image.…”
Section: Resultsmentioning
confidence: 99%
“…To improve the bond strength between the SBC and the PETG, a PB homopolymer with a number average molecular weight of 5000-40,000 was added into the SBC during the manufacturing process. 30…”
Section: Heat-bonded Film Preparationmentioning
confidence: 99%
“…Note that, unlike PET, PETG stays substantially amorphous under almost all technologically relevant processing conditions. We have already reported the relationship between the adhesive properties in PETG/SBC/PETG coextruded multilayer film 30 and determined that the presence of an excessive low molecular weight polybutadiene (PB) caused segregation at the laminate interface. The segregated PB worked as an adhesive component.…”
mentioning
confidence: 99%
“…The segregated PB worked as an adhesive component. 30 This study investigates the relationship between the adhesive properties and the microphase separation of SBC component in a PETG/SBS/PETG multilayer film during thermal bonding. In addition, we analyzed the changes in the adhesive strength when a coextruded PETG/SBC/PETG multilayer film was subjected to heat and pressure.…”
This study focuses on controlling the interfacial adhesive strength between heat-sealed styrene-co-butadiene block copolymer (SBC) and glycol-modified polyethylene terephthalate (PETG) multilayer films. In comparison, the interfacial bond strength of coextruded PETG/SBC/PETG films was weaker. The lamella structures of SBC and free polybutadiene increased the interfacial adhesive strength. The coextruded films with applied thermal pressing were also examined. When exposed to heat, the interfacial adhesive strength improved. The butadiene layer segregated along the adhesive interface, as observed by transmission electron microscopy. The butadiene layer improved the interfacial adhesive strength. The applied pressure caused the butadiene layer to segregate in a parallel manner along the adhesive interface. The developed lamellar structure did not increase adhesive strength. We considered that the adhesive strength decreased due to a thinner butadiene layer with higher pressure. We concluded that adhesive segregation along the adhesive interface improved the bond strength.
“…Then, the peeling test was performed at a crosshead speed of 300 mm/min. The peeling test was conducted in accordance with the peel test methods, such as JIS Z 0238, ASTM F88, ISO 11607-1 and 2, which have been widely used in previous studies (Nishitsuji et al 2021;Yamada et al 2015Yamada et al , 2017.…”
Reducing the amount of industrial crop waste and converting it into high value-added products in a sustainable manner will not only promote the use of biological resources but will also help in reducing the environmental impact. Bast fibers of Kozo (Broussonetia kazinoki) are a raw material of traditional Japanese paper, known as "Washi." However, the wood part of this plant is not used for Washi and is discarded. The aim of this study was to find a new future use for the wood parts of the plant. The first step was to confirm whether the wooden part of Kozo could be converted into cellulose nanofibers (CNFs). CNFs made from bast fiber alone and from bast fiber that included the outer bark were prepared as samples for comparison. Subsequently, the morphological and chemical structures of the raw materials, wood powder, pulp, and CNFs from each sample were analyzed. Consequently, we found that CNFs made from wooden parts have a chemical structure similar to that of the bast fiber, which is the raw material of Washi; however, it is the thinnest CNF of all those investigated. In addition, the CNF solution prepared from wooden parts adjusted to a 0.5-wt% concentration showed the highest viscosity characteristics and also the highest adhesive strength when applied to Japanese paper. These results indicate that waste wood parts have potential applications as chemical-free thickeners, adhesives, and restorative materials.
Poor mechanical and barrier properties of biopolymer-based
packaging
materials limit their widespread applications. The combination of
biopolymers with different nature is considered an effective strategy
to obtain complementary properties, but this method is always restricted
by the incompatibility between matrices. To combine polyamide 4 (PA4)
and poly(lactic acid) (PLA), which present excellent oxygen barrier
and water barrier properties, respectively, this study puts forward
the use of polyvinyl alcohol (PVA) as a bonding layer to connect them
and form the PA4/PVA/PLA multilayer films by the layer-by-layer solution
casting method. PA4 and PLA are successfully linked through hydrogen
bonding and electrostatic interactions with PVA. The cross-section
morphology and peel test results proved the good interlayer adhesion
between layers. After combination with PA4, the tensile strength,
elongation at break, and oxygen barrier properties of PLA were greatly
improved. The oxygen barrier of the PA4/PVA/PLA multilayer film was
more than 260 times higher than that of the PLA monolayer. PA4/PVA/PLA
films presented better thermal stability, transparency, and water
barrier properties compared to the PA4 monolayer. Besides, PA4/PVA/PLA
multilayer films presented a one-way water barrier characteristic,
which made them effective in avoiding the condensation phenomenon
when used as fruit or vegetable packaging. The study improved the
poor interfacial compatibility between PA4 and PLA and provided a
simple strategy for developing sustainable packaging with excellent
performance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
