Article
Polymer Science
Hui Li, Yue-Fei Zhang, Yan Li, Jinrong Zhong
Summary: The study showed that esterified lignin metal salts can serve as effective nucleating agents for isotactic polypropylene (iPP), resulting in increased crystallization temperature and improved toughness. Among them, EL-Zn exhibited strong beta-crystal induction ability to iPP, with potential applications in enhancing the mechanical properties of iPP composites.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Polymer Science
Shupin Luo, Chao Lv, Liang Chang, Wenjing Guo
Summary: This research investigated the effect of introducing self-assembling beta-nucleating agents into the polypropylene matrix to improve the toughness of wood flour/polypropylene composites. The results showed that the nucleating agents effectively induced beta-crystal formation, decreased spherulite size, increased crystallization temperature, and accelerated the crystallization process. The addition of the nucleating agents significantly improved the toughness and crystallization of the composites.
Article
Thermodynamics
Sheng Nie, Jin-Rong Zhong, Yan Li, Yue-Fei Zhang
Summary: A series of polyacrylic salts were investigated as nucleating agents in isotactic polypropylene, and it was found that zinc polyacrylate, potassium polyacrylate, and sodium polyacrylate can induce beta-crystals and improve the impact strength of iPP, while having no significant effect on its tensile strength and flexural modulus.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Wanxin Peng, Jian Kang, Xiuduo Song, Yue Zhang, Bo Hu, Ya Cao, Ming Xiang
Summary: The effects of MXene on the crystallization behavior of beta-nucleated isotactic polypropylene (iPP) were studied, revealing that the beta-nucleation efficiency of WBG-II is higher than the alpha-nucleation efficiency of MXene when compounded together, indicating a competitive relationship between the two.
Article
Chemistry, Physical
Mateusz Barczewski, Olga Mysiukiewicz, Michal Dutkiewicz, Mariusz Szolyga, Monika Dobrzynska-Mizera, Adam Piasecki
Summary: This study aimed to investigate the influence of shear stress during real-life industrial processes on the crystallization of isotactic polypropylene nucleated with a silsesquioxane-based beta-nucleating agent. The samples were prepared by compression molding and injection molding, and the thermal, morphological, and mechanical properties were studied to evaluate the efficiency of the nucleating agents under shearing conditions. The results showed that both the silsesquioxane-based and commercial nucleating agents have similar effects on the formation of the hexagonal iPP phase, considering the shearing and cooling conditions.
Article
Polymer Science
Shohei Iwasaki, Yohei Uchiyama, Miwa Tenma, Masayuki Yamaguchi
Summary: The study found that injection-molded plates containing lithium stearate were more transparent than those containing calcium stearate, but in certain conditions, calcium stearate could effectively improve transparency.
Article
Thermodynamics
Qian Ding, Hao Fu, Chaoran Hua, Xinman Jiang, Jia Yu, Keming Zhu
Summary: This study investigates the crystallization behavior, melting characteristics, and semicrystalline morphologies of wollastonite-filled recycled polypropylene (R-PP) composites with and without beta-nucleating agent. The addition of beta-nucleating agent can significantly increase the beta-phase content in wollastonite-filled R-PP composites, providing an effective method for achieving high value-added and low-cost recycling of R-PP.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
Wenxia Jia, Ranran Zhuo, Mingkun Xu, Jiaxiang Lin, Xiaoting Li, Chuntai Liu, Changyu Shen, Chunguang Shao
Summary: Using a homemade pressure device, the synergistic effect of pressurization rate and beta-form nucleating agent on the crystallization of isotactic polypropylene melt was explored. Different crystal phases of iPP were found to be influenced by the pressurization rate, with a competitive growth between beta- and gamma-iPP observed at specific rates. The presence of mesophase was also determined by the pressurization rate, with a theoretical model of pressurization-induced crystallization established to explain the process.
Article
Thermodynamics
Jiao Xiang, Yan Li, Jin-Rong Zhong, Cui-Hong Lu, Yue-Fei Zhang
Summary: This study investigates the applicability of different structural bisamide compounds as nucleating agents for iPP. DSC analysis shows that these agents have a clear impact on nucleus density in iPP, with better nucleation effect seen with even carbon numbers and cyclic side substitution. Further tests using WAXD and Materials Studio confirm the structure-nucleation effect relationship, while lattice matching theory suggests that the nucleating agents induce epitaxial growth of iPP on their surface.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Shiqi Chen, Luhan Bai, Xuanlun Wang, Handong Li, Ben Bin Xu, Hassan Algadi, Zhanhu Guo
Summary: This study investigates the effect of the content of nano-SiO2/beta-nucleating agent on the crystallization and mechanical behaviors of PP-R. It is found that an appropriate content of nano-SiO2 and beta-nucleating agent can enhance the mechanical properties of the composite. Furthermore, nano-SiO2/beta-nucleating agent significantly accelerates the nucleation and growth of crystallites.
POLYMER INTERNATIONAL
(2023)
Article
Polymer Science
Xinyi Guo, Chunyan Luo, Minggang Fang, Jianxin Sun, Mingyuan Chen
Summary: This article studied the promoting behavior of TMC-300 on PLA crystallization. The results showed that the increase of TMC-300 content significantly increased crystallinity up to 22 times and decreased t(1/2) significantly. Meanwhile, the addition of TMC-300 transformed the typical spherical crystal morphology of PLA into attached TMC-300 fibrous crystal morphology. In terms of mechanical properties, the tensile strength reached its maximum at 0.5 wt% of TMC-300 content, resulting in an increase of 23.09%, while the thermal stability of PLA composites deteriorated with the increase of nucleating agent content.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Yang Yue, Xuan Sha, Fushan Wang, Yan Gao, Liangliang Zhang, Xinxin Wang, Jiachun Feng
Summary: The effect of beta-nucleating agent on the self-nucleation of isotactic polypropylene was systematically investigated in this study. It was found that the presence of beta-NA increased the transition temperatures and narrowed the temperature width of the self-nucleation domain of iPP. The increased thermal stability of ordered structures in iPP containing beta-NA may be related to the beta-alpha transformation occurred upon heating.
Article
Polymer Science
Xiaoke Liu, Shuang Jin, Zhiliang Shi, Hang Cong, Wei Gong, Yuhui Zhou
Summary: A novel beta-nucleating and foaming nucleating agent HQ[6]/EA was synthesized for polypropylene (PP), which significantly improved the crystallization rate, crystallinity, and mechanical properties of nucleated PP. When used as a nucleating agent, HQ[6]/EA showed reduced cell size and increased cell density in the foamed PP composite. The addition of HQ[6]/EA at 0.5% (by weight) exhibited considerable enhancement in tensile, flexural strength, and impact strength properties of PP composites.
IRANIAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Liyuan Liu, Ying Zhao, Chunbo Zhang, Zhiyuan Dong, Kezhi Wang, Dujin Wang
Summary: The research investigated the impact of the morphological characteristics of N,N'-dicyclohexylterephthalamide (DCHT) on the polymorphic composition of isotactic polypropylene (iPP), showing that small-sized DCHT crystals have a greater influence on the formation of beta-crystals.
Article
Polymer Science
Chao Lv, Shupin Luo, Wenjing Guo
Summary: This study investigates the use of a beta-nucleating agent, TMB-5, to improve the mechanical properties of isotactic PP. The addition of TMB-5 accelerates crystal nucleation and induces beta-crystal growth. The results show that TMB-5 can effectively improve the crystallization rate and mechanical properties of WF/isotactic PP composites.