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Zhidan Lin,Baofeng Xu,Zixian Guan,Chao Chen 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
It has been observed that the formation of b-crystal is suppressed when b-polypropylene (b-PP) is blended with crystalline polymers, but the reason is still uncertain. In this study, we investigated the influence of the crystallization conditions of polytrimethylene terephthalate (PTT), such as melt crystallization, cold crystallization, isothermal crystallization temperature, and crystallization time on the b-nucleation behavior of PP phase in the b-PP/PTT blends. The results showed that the b-crystal content of PP phase in the blends decreases with increasing of PTT content. Cold crystallization of PTT would mainly induce the formation of a-crystal in PP component, whereas melt crystallization would induce the formation of b-crystal PP in their blends. The degree of crystallinity of PTT increases by improving the crystallization temperature or extending the time of crystallization, which leads to the production of more a-crystal in PP component. This means that the second component could inhibit the formation of b-crystal in PP.
Crystallization and melting behavior of polypropylene in b-PP/polyamide 6 blends containing PP-g-MA
Zhidan Lin,Zixian Guan,Baofeng Xu,Chao Chen,Guangheng Guo,Jiaxian Zhou,Jiaming Xian,Lin Cao,Yueliang Wang,Mingqing Li,Wei Li 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
In this research, we used a twin-screw extruder to melt and blend PP-g-MA compatibilizer with bpolypropylene (PP)/polyamide 6 (PA6). The influences of the PA6 and PP-g-MA contents in PP/PA6 blends on crystallization and melting behavior of PP phase and morphology were investigated. The results showed that, when PP-g-MA copolymer was added to the b form of nucleated PP/PA6 blends, the anhydride groups in PP-g-MA and PA6 terminal amine groups react to form PP-g-PA graft copolymer in a two-phase interface. This reduces the interfacial tension, improves the interfacial adhesion, and reduces the size of PA6 domains in the blend. The generated PP-g-PA graft copolymer wrapped PA6 phase and buried the anhydride groups of PP-g-MA. When the proportion of PP-g-MA and PA6 was between 0.5 and 0.75, there was no longer interfering to the formation of b-crystals in the PP phase. The content of bcrystal of PP phase in blends was found to reach as large as 85.9%.
Yanyu Chen,Xiao Wang,Huaijun Lin,Florian Vogel,Wei Li,Lin Cao,Zhidan Lin,Peng Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
A simple and efficient method for disposing of waste low-density polyethylene (LDPE) express packagingbags is proposed in this paper as a way to minimize waste and address the energy shortage at the sametime. In addition to following the production of carbon nanotubes (CNTs) derived from LDPE, the applicationof CNTs as electrodes for supercapacitors was attempted. Waste LDPE bags were pyrolyzed andcarbonized with catalyst using a dual-temperature reaction system, a designed 450 C pyrolysis temperatureaccompany with different carbonization temperatures (650 C, 700 C, 750 C, 800 C, 850 C), andtreatment durations (0 h, 2 h, 4 h, 6 h) were investigated. As determined by FE-SEM and FE-TEM, the CNTssynthesized at 750 C showed a finer tube diameter, much more uniform distribution, bamboo-like structure,as well as the highest yield of 41.9 %, and carbon conversion of 61.2 %. As being charged and discharged10,000 times, the electrode remained a 93.16 % capacitance and a 92.85 % Coulomb efficiency. A dual-temperature reaction system could be utilized to recycle waste LDPE efficiently, and the LDPEderivedCNTs could be applied for supercapacitors.