Article
Polymer Science
Jae Sik Seo, Ho Tak Jeon, Tae Hee Han
Summary: The study investigated the morphologies and physical properties of twin-screw-extruded polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with different blend ratios. It was found that with an increase in ABS content, the phase structure in PC-rich blends transitioned from needle-like to sea-island, leading to significant changes in the rheological properties of the blends.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Adrian Korycki, Christian Garnier, Amandine Abadie, Valerie Nassiet, Charles Tarek Sultan, France Chabert
Summary: The study elaborated PEEK/PES blends with partial miscibility by melt mixing with phenolphthalein, which was confirmed by DSC and DMTA analysis. Phenolphthalein acted as a compatibilizer and plasticizer for the blends, resulting in a softened PEEK phase and improved interfacial adhesion with PES. Additionally, the storage modulus in the glassy region of the blends remained similar to pure PEEK due to the aromatic moieties in phenolphthalein.
Article
Polymer Science
Xin-Zhu Wang, Jing-Wen Wang, Hou-Qing Wang, Guo-Chao Zhuang, Jian-Bao Yang, Ying-Jie Ma, Yang Zhang, Hua Ren
Summary: The mechanical properties of thermoplastic polyurethane (TPU) were improved by modifying it with polyether-block-amide elastomer (PEBA) through blending. The addition of a compatible agent, E-PU-I, improved the compatibility between TPU and PEBA, leading to more uniform dispersion and smaller particle size, thereby enhancing the overall performance of the blends. The mechanical properties of the blends were significantly improved when the critical E-PU-I content was around 3.2 parts.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Juan Bai, Huijie Pei, Xingping Zhou, Xiaolin Xie
Summary: Poly(butylene adipate-co-terephthalate) (PBAT) is widely used in the production of biodegradable films due to its high elongation, flexibility, and processability. However, its high cost compared to traditional plastics such as polyethylene has led to research on reducing PBAT cost through blending with thermoplastic starch (TPS) using reactive epoxy compatibilizer (REC) and two-step extrusion. The results showed that REC improved compatibility and mechanical properties of PBAT/TPS blends, with blends obtained through two-step extrusion showing a bicontinuous phase structure and excellent performance even with high TPS contents.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Polymer Science
Thi Thu Loan Doan, Michael Thomas Muller, Hoang M. Nguyen
Summary: This work investigates the effect of blending three polyolefin-based copolymers with polypropylene (PP) on the mechanical properties of PP. The results show that adding 20% of certain copolymers significantly enhances the impact toughness of PP. The particle size of the added immiscible copolymers is found to play a key role in enhancing PP impact toughness.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Hedayatollah Sadegh Ghari, Hossein Nazockdast
Summary: The toughening efficiency of differently plasticized thermoplastic starches in PLA/TPS blend was studied. The addition of citric acid as a co-agent significantly reduced the viscosity and melt elasticity of TPS, leading to smaller particle size and enhanced toughness. The addition of dynamically cross-linked EVA in PLA/TPS ternary blends resulted in a special matrix-disperse morphology, enabling the blends to exhibit remarkably higher toughness.
Article
Chemistry, Multidisciplinary
Kui Wang, Xuefei Jin, Xiuhong He, Weijiang Huang, Qin Tian, Qiuping Fu, Wei Yan
Summary: Polymer blending has been widely used to fabricate polymeric films due to its superior properties. In this study, an aluminum phosphate-coated halloysite nanotube was fabricated and used to improve the performance of polyethylene oxide/poly(butylene adipate-co-terephthalate) blends. The mechanical and rheological properties of the films were systematically discussed.
Article
Chemistry, Physical
Tetsuo Takayama
Summary: Polycarbonate (PC), an engineering plastic, is a strong and tough transparent polymer used in fields where mechanical properties and transparency are required. However, it has a high melt viscosity, which can be adjusted by blending it with polystyrene (PS) but results in increased brittleness. The dispersion of small amounts of inorganic clay and silica particles in PC/PS blends improves impact strength while maintaining transparency, as the inorganic particles promote the fine dispersion of PS and apply isotropic interaction forces to enhance polymer blend compatibility.
Article
Polymer Science
Jin-Oh Jeong, Yong-Hyeon Oh, Sung-In Jeong, Jong-Seok Park
Summary: In this study, HDPE/PU blends with new and excellent physical properties were developed through improved compatibility and the use of electron beam crosslinking technology.
Article
Polymer Science
Md Abu Shaid Sujon, Tito Andriollo, Aminul Islam
Summary: This investigation focuses on enhancing the damping properties of MABS by blending it with VDT and SEBS-g-MAH. The results show that the blend's damping performance increases with the amount of VDT, while the inclusion of 4% SEBS-g-MAH leads to the most substantial improvements.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Jianing Shen, Kai Wang, Zhao Ma, Nai Xu, Sujuan Pang, Lisha Pan
Summary: The impacts of PGA content on the properties of PBAT/PGA blends were studied, with an epoxy chain extender (ADR) used as a reactive modifier to improve interface compatibility and rheological properties. Compared to neat PBAT, PBAT/PGA/ADR blends showed better stiffness-ductility balance and processing stability.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
M. G. Anagha, Tuhin Chatterjee, Francesco Picchioni, Kinsuk Naskar
Summary: The effects of electron beam radiation on thermoplastic elastomers based on SEBS/TPU and SEBS-g-MA/TPU were evaluated. Both systems showed the presence of three-dimensional cross-linked networks after irradiation. SEBS-g-MA/TPU exhibited improved tensile strength and interfacial adhesion, while SEBS/TPU showed reduced tensile strength with increased radiation dose. The blends also demonstrated improvements in thermal stability, rheological properties, and morphological characteristics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Nawel Mokrane, Mustapha Kaci, Jose-Marie Lopez-Cuesta, Nadjet Dehouche
Summary: This study investigates the effect of adding HNTs and PLA-g-MA on the morphology and properties of PLA/PHBHHx blends. The results show that HNTs are preferentially localized in PHBHHx nodules and combining HNTs with PLA-g-MA results in a finer and more homogeneous morphology. Adding HNTs significantly improves the impact strength, while adding PLA-g-MA also significantly enhances the tensile strength, elongation at break, and impact strength. Furthermore, the compatibilized blend reinforced with HNTs exhibits improved thermal stability.
Article
Polymer Science
Jaber Nasrollah Gavgani, Fatemeh Goharpey
Summary: We investigated reactive compatibilization in immiscible polymer blends by grafting two multifunctional polymers onto a graphene surface. Reactive compatibilizer-grafted graphene (RCG) nanoparticles were synthesized and added to polyisoprene (PI) and polydimethysiloxane (PDMS) blends. The results showed that the blend with 0.1 wt% RCG exhibited unusual characteristics including nonspherical and bridged droplets, while the blend with 1 wt% RCG showed a typical droplet-matrix morphology. The rheological results also displayed asymmetry, with the 0.1 wt% RCG blend exhibiting gel-like behavior and high viscosity, while the 1 wt% RCG blend displayed liquid-like behavior and low viscosity.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Carlos Bruno Barreto Luna, Danilo Diniz Siqueira, Edcleide Maria Araujo, Emanuel Pereira Nascimento, Joao Baptista Costa Agra de Melo
Summary: The use of SEBS as a compatibilizing agent in PP/ABS blends resulted in significant improvements in impact strength, thermal stability, and tensile strength. The addition of SEBS helped refine the morphology without compromising other properties of PP, while also enhancing toughness and thermal stability.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Jeong-Un Jin, Dong-Hoon Lee, Ki-Ho Nam, Jaesang Yu, Young-Kwan Kim, Munju Goh, Seo Gyun Kim, Heon Sang Lee, Bon-Cheol Ku, Nam-Ho You
APPLIED SURFACE SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Seo Gyun Kim, Dowan Kim, Sorie Kim, Jinhwan Yoon, Heon Sang Lee
MACROMOLECULAR MATERIALS AND ENGINEERING
(2019)
Article
Engineering, Multidisciplinary
Ki-Ho Nam, Kyeongmin Kim, Seo Gyun Kim, Heon Sang Lee, Hana Jung, Jaesang Yu, Se Gyu Jang, Bon-Cheol Ku, Bongjin Moon, Nam -Ho You
COMPOSITES PART B-ENGINEERING
(2019)
Article
Mechanics
Minji Park, Heon Sang Lee
JOURNAL OF RHEOLOGY
(2020)
Article
Polymer Science
Seo Gyun Kim, Heon Sang Lee
Article
Engineering, Environmental
Hyeon Dam Jeong, Seo Gyun Kim, Gyeong Min Choi, Minji Park, Bon-Cheol Ku, Heon Sang Lee
Summary: The orientation factor plays a crucial role in producing highly strong conductive carbon nanotube (CNT) fibers. A theoretical model is proposed to obtain well-aligned CNT fibers with superior properties through wet-spinning of CNTs in a superacid. The model predicts the minimum draw ratio for achieving target orientation and stable operation window using linear stability analysis of the draw resonance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Mechanics
Gyeong Min Choi, Minji Park, Seung Yol Jeong, Heon Sang Lee
Summary: This study investigates the structure and dynamics of graphene oxide aqueous alkaline dispersions through combined simulation and experimental methods. It reveals that as the concentration increases, these materials behave similarly to lyotropic systems, with broader sheet spacing in the ordered phases. The rheological responses in the isotropic phase resemble rod-like liquid crystals, while dispersions in the biphase and discotic phase behave like polydomain liquid crystal polymers.
JOURNAL OF RHEOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Gyeong Min Choi, Minji Park, Yul Hui Shim, So Youn Kim, Mina Namvari, Heon Sang Lee
Summary: The study introduces a simple method for mass production of 3D microtubes made of graphene oxide (GO) while preserving their 2D properties by rolling up GO sheets with shear force. GO mesotubes are formed by shear flow in aluminum-glass parallel plates, with redox reaction playing a vital role in their formation. The high yield of 94% is achieved at an initial pH of 2.2, with no re-stacking of GO sheets in the tube wall, demonstrating potential applications in soft robotics, e-skins, and visible light sensors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Correction
Chemistry, Multidisciplinary
Gyeong Min Choi, Minji Park, Yul Hui Shim, So Youn Kim, Mina Namvari, Heon Sang Lee
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Mechanics
Javad Rahmannezhad, Hyeon Dam Jeong, Seungchan Ryu, Heon Sang Lee
Summary: We prepared carbon fiber reinforced polycarbonates (CFR-PC) using co-rotating twin screw extruder and injection molding. The orientational morphology of CFR-PC was simulated by inverse calculation from the measured transient stress curve using 8 mm disk rotational rheometer. The stress evolution was expressed by a function of the Fredholm integral of the first kind, and the total stress was expressed by a linear combination contributed from a stress at each orientation state. We used an extended White-Metzner model with Dinh-Armstrong flow-fiber coupling term as a constitutive equation for evaluating the stress at each orientation state. The probability density of each orientation state was determined by the Tikhonov regularization method from the measured stress overshoot. Finally, the orientation distribution functions (ODFs) of CFR-PC were determined by maximum entropy method from the determined probability density of orientation state. The simulated morphology by the ODF was well consistent with the morphology obtained by optical microscopy for the CFR-PCs.
KOREA-AUSTRALIA RHEOLOGY JOURNAL
(2022)
Article
Polymer Science
Gyeong Min Choi, Heon Sang Lee
Summary: We present a mesoscopic theory of the extensional rheology of liquid crystalline carbon nanotubes (CNTs), which predicts the extensional viscosity and minimum draw ratio by considering the repulsive excluded volume potential and elastic potential.
Article
Nanoscience & Nanotechnology
Hongjin Lim, Young-Kyeong Kim, Hong-Sik Kim, Taegeon Lee, Md Monir Hossain, Hyun-Oh Jeong, Heon Sang Lee, Hyunjin Cho, Yongho Joo, Sang Seok Lee, Sungjune Park, Heesuk Rho, Hyeon Su Jeong, Myung Jong Kim, Seokhoon Ahn, Se Youn Moon, Keun Su Kim, Siyoung Q. . Choi, Bumjoon J. Kim, Se Gyu Jang
Summary: Microfiber fabrication via wet-spinning of lyotropic liquid crystals (LCs) with anisotropic nanomaterials is of great interest due to the excellent physical/chemical properties obtained from the alignment of anisotropic nanomaterials. However, achieving high colloidal stability of anisotropic nanomaterials in lyotropic LCs has been a challenge. In this study, a cationically charged polymeric stabilizer was proposed to effectively adsorb on the surface of boron nitride nanotubes (BNNTs), resulting in high colloidal stability of BNNTs up to 22 wt%. Optical and rheological analysis were used to optimize the phase behavior and rheological properties for wet-spinning of BNNT LCs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Seo Gyun Kim, Nam-Ho You, Bon-Cheol Ku, Heon Sang Lee
ACS APPLIED NANO MATERIALS
(2020)
Article
Chemistry, Physical
Chang Min Ok, Seo Gyun Kim, Seung Yol Jeong, Heon Sang Lee
Article
Polymer Science
Gyeong Min Choi, Heon Sang Lee
Summary: In this study, a mesoscopic theory of the extensional rheology of liquid crystalline carbon nanotubes (CNTs) was presented, predicting extensional thinning behavior and a minimum draw ratio. The rotational relaxation time was found to be proportional to the reciprocal excluded volume, especially for long CNTs with waviness. The existence of a minimum draw ratio was attributed to the large excluded volume potential of long CNTs.