Article
Polymer Science
Priyanka Main, Sandra Petersmann, Nadine Wild, Michael Feuchter, Ivica Duretek, Mariya Edeleva, Peter Ragaert, Ludwig Cardon, Thomas Lucyshyn
Summary: This study explores the potential of mechanical recycling for polyhydroxybutyrates (PHBs) by multiple extrusion cycles and various characterization tests. The results demonstrate that PHBs maintain their properties and can be effectively recycled through mechanical processes.
Article
Materials Science, Multidisciplinary
Giuseppe Antinucci, Andrea Pucciarelli, Antonio Vittoria, Francesco Zaccaria, Gaia Urciuoli, Christian Ehm, Felicia Daniela Cannavacciuolo, Roberta Cipullo, Vincenzo Busico
Summary: High-impact polypropylenes (HIPPs) are complex blends that consist of a crystalline isotactic polypropylene matrix and a dispersed phase comprising an amorphous ethylene/propylene copolymer (EPR). The properties of the material and its application are heavily influenced by the relative amount and composition of EPR, which need to be precisely controlled. Traditional analytical methods are time-consuming, labor-intensive, and require large amounts of sample and toxic solvent xylene. Here, we present an analytical approach based on crystallization elution fractionation for HIPP characterization, which is fast, requires only a small amount of sample, and does not rely on sophisticated and expensive techniques.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Alexander Felgel-Farnholz, Andrea Schweighuber, Christian W. Klampfl, Jorg Fischer
Summary: Stricter regulations of plastics waste and higher recycling quotas have led to increased interest in mechanical recycling. Analytical techniques are needed to characterize the recyclates and identify those that do not meet requirements. Long-time extrusion experiments were conducted on three types of polyethylene (PE) to understand degradation during multiple recycling steps. The presence of stabilizers showed different effects on polymer degradation, with one stabilizer having little impact and another showing a beneficial influence. The study also found differences in degradation behavior among the PE types.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Li Qian, Yue Zhang, Xintong Zhao, Mingyue Xiang, Ying Lu, Yongfeng Men
Summary: The study found that ICP exhibited more intensive cavitation during stretching, which was attributed to the changes in the stability of the rubber particles, providing more nucleation sites for cavities.
Article
Polymer Science
Sandeep N. Tripathi, Devesh K. Shukla, Sateesh Bonda, Sukdeb Saha, Abhishek P. Patade, Vivek K. Srivastava, G. S. Srinivasa Rao, Rakshvir Jasra
Summary: Polypropylene (PP) is a widely used commodity plastic material. This study focuses on the formation of colored lumps in polypropylene random copolymer (PPCP) during storage and analyzes the probable causes. Characterization of the lumps using various methods reveals differences in molecular chain length and low molecular weight compared to pure PPCP. The possible reasons for the colored lump formation are discussed.
Article
Polymer Science
Li Qian, Yaxian Wang, Ying Lu, Yongfeng Men
Summary: Research on the crystallization behaviors of two impact copolymer polypropylenes (ICP) revealed differences in their crystallization peaks at different cooling rates, with ICP-A and ICP-B showing distinct behaviors. These differences can be attributed to their different chain microstructures.
Article
Polymer Science
Liang Wang, Bing-yu Chen, Meng-hao Ji, Da-gang Guo, Xin-hai He, Najeeb Ur Rehman Lashari, Chong Fu, Jing Zheng
Summary: Poly (propylene fumarate) (PPF) has been studied as an injectable and biodegradable bone cement alternative to polymethyl methacrylate. The addition of hydroxyapatite reinforcement improves the mechanical and degradation properties of the composite material. Cell culture experiments showed that the composite material is biocompatible and enhances cell attachment and proliferation.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Mahmoud Embabi, Mu Sung Kweon, Ya Xian Wang, Tzu-Pin Lin, Carlos R. Lopez-Barron, Patrick C. Lee
Summary: This study investigates the effect of ionic content on the foaming behavior of linear PP ionomers and finds that ionomers with higher ionic content exhibit better foam properties.
Article
Polymer Science
Emmanuel Richaud, Muriel Ferry, Floriane Carpentier, Sophie Rouif, Laurent Cortella, Stephane Esnouf
Summary: This study investigates the impact of efficient sterilization on FFP2 masks during the SARS-CoV2 pandemic. Testing different irradiation methods under vacuum, it was found that changes induced by irradiation under vacuum were relatively minor, while those from gamma-ray irradiation under air were more significant.
Article
Polymer Science
Jingru Liu, Bingkun Lu, Rui Xiao
Summary: The comparative study on the annealing-induced high impact toughness of linear and grafted polypropylene random copolymer (PPR and MPP) was conducted. It was found that PPR displayed higher flexural modulus and impact strength, as well as lower elongation at break than MPP. After thermal annealing treatment, the crystallinity and impact strength of PPR were significantly increased compared to those of MPP.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Materials Science, Characterization & Testing
Ho Suk Ji, Hyun Wook Jung
Summary: The influence of multiple injection on the structural and mechanical properties of impact copolymers (ICP) was studied. Thermo-mechanical degradation caused chemical changes and altered the crystallinity of the ICPs. The deformation of dispersed ethylene-propylene copolymer (EPC) particles was affected by the degradation, resulting in agglomeration and reduced dispersity. This had a negative effect on the mechanical properties, particularly the Izod impact strength.
Article
Polymer Science
Mansour Alotaibi, Thamer Aldhafeeri, Carol Barry
Summary: This study investigated the impact of a quad screw extruder on the reprocessing of an impact copolymer polypropylene. The quad screw extruder showed greater reductions in molecular weight compared to a twin-screw extruder.
Article
Polymer Science
Ya-Fang Tan, Wen-Qiang Wang, Ling Gao, Ai-Guo Guan, Geng-Chao Wang
Summary: A functional emulsion binder with multi crosslinked structure was designed to solve the volume change and shuttle effect issues in lithium-sulfur batteries. The covalent crosslinking within and between the emulsion particles enabled the sulfur cathode to adapt to volume expansion, ensuring electrode integrity. The polar functional groups of the binder facilitated strong chemisorption of lithium polysulfide and fast lithium-ion migration. The assembled lithium-sulfur battery exhibited a high initial discharge capacity of 1246 mAh/g at 0.1 C, and a capacity fading rate of 0.04% per cycle after 500 cycles at 0.5 C. Even at a high sulfur mass loading of 4.8 mg/cm2, a high capacity of 956 mAh/g was still obtained at 0.2 C.
CHINESE JOURNAL OF POLYMER SCIENCE
(2023)
Article
Polymer Science
Youlin Qin, Mingchao Li, Tuankang Huang, Chunhui Shen, Shanjun Gao
Summary: In this study, a star-shaped flame retardant containing phosphorus and nitrogen was synthesized and combined with ammonium polyphosphate to form an intumescent flame-retardant system. The stable star-shaped structure and the synergistic effect between phosphorus and nitrogen enabled the formation of an insulating char layer on the surface of the polymer matrix. The flame retardancy and thermal stability of the composite were significantly improved compared to pure polymer.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Environmental Sciences
Qiang Wu, Jizhong Meng, Hang Yao, Rui Tang, Shoujun Yuan, Yulan Wang, Wei Wang, Haiping Luo, Zhen-Hu Hu
Summary: In this study, a floating TiO2/EVA photocatalyst was successfully synthesized using a simple thermal crosslinking procedure with ethylene-vinyl acetate copolymer (EVA) as the support material. The photocatalyst exhibited uniform TiO2 dispersion and high stability, leading to a significant enhancement in the degradation efficiency of Rhodamine B.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Polymer Science
Tetsu Sato, Mariko Takahashi, Takeshi Saito, Masahito Toyonaga, Itsuo Tanuma, Rie Yamada, Satoru Hosoda
Summary: An automatic evaluation system for photooxidation has been developed and successfully applied to assess the photo-OIT of LDPE samples containing photooxidation stabilizers. The system allows independent setting of various measurement conditions and provides detailed information on the photooxidation process.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Zongzheng Zuo, Shuxue Zhou
Summary: In this study, three fluoroalkyl trimethoxysilane (FATMS) additives with different chain lengths were incorporated into a two-component polyurethane clearcoat to improve its hydrophobic durability. The coatings modified with FATMS maintained their surface hydrophobicity under various conditions, but quickly lost it when exposed to both UV irradiation and/or high temperature with water. The results suggest that the FATMS route is more suitable for indoor applications at room temperature.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Song Li, Feng Zhao, Xueya Wang, Zhihua Liu, Jingze Guo, Yutong Li, Shuangmei Tan, Zhenxiang Xin, Shuai Zhao, Lin Li
Summary: Green flame retardants have garnered attention for their environmental friendliness, but current options fall short in achieving high flame retardancy for flammable polymers and maintaining environmental protection. This study takes a two-pronged approach to address flame retardants and the flame-retardant process. An eco-friendly bio-based synergistic flame retardant (PAU), synthesized using phytic acid (PA) and urea (U), is used to create a flame retardant coating that can be directly applied to any surface shape using polydopamine as an adhesive. The resulting EPS-PAU exhibits excellent flame retardancy, smoke suppression, and light weight while only slightly increasing the density.
POLYMER DEGRADATION AND STABILITY
(2024)