Zn‐salt poly(styrene– ran –cinnamic acid) ionomer as a polystyrene with improved impact toughness, heat resistance, and minimally compromised processability

2021 ◽  
pp. 52041
Author(s):  
Zhiyuan Song ◽  
Jie Wang ◽  
Qian Tao ◽  
Yang Yu ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Heat Resistance ◽  
Cinnamic Acid

scholarly journals Poly(styrene-ran-cinnamic acid) (SCA), an approach to modified polystyrene with enhanced impact toughness, heat resistance and melt strength

RSC Advances ◽  
2019 ◽  
Vol 9 (68) ◽  
pp. 39631-39639
Author(s):  
Jie Wang ◽  
Zixin Yu ◽  
Peihua Li ◽  
Dachuan Ding ◽  
Xuan Zheng ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Impact Toughness ◽  
Heat Resistance ◽  
Cinnamic Acid ◽  
Cross Linking ◽  
Melt Strength ◽  
Modified Polystyrene

Carboxyl-bearing cinnamic-acid copolymerised polystyrene exhibits enhanced impact toughness, heat resistance and melt strength due to its reversible hydrogen bond cross-linking.

scholarly journals Melt Blending Modification of Commercial Polystyrene with Its Half Critical Molecular Weight, High Ion Content Ionomer, Poly(styrene–ran–cinnamic Acid) Zn Salt, toward Heat Resistance Improvement

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 584
Author(s):  
Zixin Yu ◽  
Jie Wang ◽  
Peihua Li ◽  
Dachuan Ding ◽  
Xuan Zheng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Heat Resistance ◽  
Cinnamic Acid ◽  
Average Molecular Weight ◽  
Softening Temperature ◽  
Melt Blending ◽  
Ion Content ◽  
Critical Weight ◽  
Critical Molecular Weight ◽  
Cross Links

A half-critical weight-average molecular weight ( M ¯ w ) (approximately 21,000 g mol−1), high-ion-content Zn-salt poly(styrene–ran–cinnamic-acid) (SCA–Zn) ionomer was successfully synthesized by styrene–cinnamic-acid (10.8 mol %) copolymerization followed by excess-ZnO melt neutralization. At 220 °C, the SCA–Zn’s viscosity was only approximately 1.5 magnitude orders higher than that of commercial polystyrene (PS) at 102 s−1, and the PS/SCA–Zn (5–40 wt %) melt blends showed apparently fine, two-phased morphologies with blurred interfaces, of which the 95/5 and 90/10 demonstrated Han plots suggesting their near miscibility. These indicate that any PS–(SCA–Zn) processability mismatch was minimized by the SCA–Zn’s half-critical M ¯ w despite its dense ionic cross-links. Meanwhile, the SCA–Zn’s Vicat softening temperature (VST) was maximized by its cross-linking toward 153.1 °C, from that (97.7 °C) of PS, based on its half-critical M ¯ w at which the ultimate glass-transition temperature was approximated. Below approximately 110 °C, the PS/SCA–Zn (0–20 wt %) were seemingly miscible when their VST increased linearly yet slightly with the SCA–Zn fraction due to the dissolution of the SCA–Zn’s cross-links. Nevertheless, the 60/40 blend’s VST significantly diverged positively from the linearity until 111.1 °C, revealing its phase-separated morphology that effectively enhanced the heat resistance by the highly cross-linked SCA–Zn. This work proposes a methodology of improving PS heat resistance by melt blending with its half-critical M ¯ w , high-ion-content ionomer.

scholarly journals Manipulating Crystallization for Simultaneous Improvement of Impact Strength and Heat Resistance of Plasticized Poly(l-lactic acid) and Poly(butylene succinate) Blends

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3066
Author(s):  
Todsapol Kajornprai ◽  
Supakij Suttiruengwong ◽  
Kalyanee Sirisinha
Keyword(s):  
Lactic Acid ◽  
Impact Toughness ◽  
Impact Strength ◽  
Heat Resistance ◽  
Decisive Role ◽  
Annealed Sample ◽  
Crystalline Morphology ◽  
Butylene Succinate ◽  
Poly Ethylene ◽  
Short Time

Crystalline morphology and phase structure play a decisive role in determining the properties of polymer blends. In this research, biodegradable blends of poly(l-lactic acid) (PLLA) and poly(butylene succinate) (PBS) have been prepared by melt-extrusion and molded into specimens with rapid cooling. The crystalline morphology (e.g., crystallinity, crystal type and perfection) is manipulated by annealing the molded products from solid-state within a short time. This work emphasizes on the effects of annealing conditions on crystallization and properties of the blends, especially impact toughness and thermal stability. Phase-separation morphology with PBS dispersed particles smaller than 1 μm is created in the blends. The blend properties are successfully dictated by controlling the crystalline morphology. Increasing crystallinity alone does not ensure the enhancement of impact toughness. A great improvement of impact strength and heat resistance is achieved when the PLLA/PBS (80/20) blends are plasticized with 5% medium molecular-weight poly(ethylene glycol), and simultaneously heat-treated at a temperature close to the cold-crystallization of PLLA. The plasticized blend annealed at 92 °C for only 10 min exhibits ten-fold impact strength over the starting PLLA and slightly higher heat distortion temperature. The microscopic study demonstrates the fracture mechanism changes from crazing to shear yielding in this annealed sample.

Remarkably Enhanced Impact Toughness and Heat Resistance of poly(l-Lactide)/Thermoplastic Polyurethane Blends by Constructing Stereocomplex Crystallites in the Matrix

2015 ◽  
Vol 4 (1) ◽  
pp. 111-120 ◽  
Author(s):  
Zhenwei Liu ◽  
Yuanlin Luo ◽  
Hongwei Bai ◽  
Qin Zhang ◽  
Qiang Fu
Keyword(s):  
Impact Toughness ◽  
Heat Resistance ◽  
Thermoplastic Polyurethane ◽  
The Matrix

Stereocomplex crystallites induce simultaneous enhancement in impact toughness and heat resistance of injection-molded polylactide/polyurethane blends

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17008-17015 ◽  
Author(s):  
Jia Dai ◽  
Hongwei Bai ◽  
Zhenwei Liu ◽  
Liang Chen ◽  
Qin Zhang ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Heat Resistance ◽  
Melt Processing ◽  
Processing Technology ◽  
Heat Resistant ◽  
Promising Strategy ◽  
Injection Molded

A promising strategy for the manufacture of super-toughened and heat-resistant PLLA/elastomer blends by using practical melt processing technology with the aid of stereocomplex crystallites is presented.

279: Inhibition of Cyclooxygenase-2 Pathway Overcomes the Heat-Resistance in Prostate Cancer Cells

2007 ◽  
Vol 177 (4S) ◽  
pp. 93-93
Author(s):  
Makoto Sumitomo ◽  
Kenji Kuroda ◽  
Takako Asano ◽  
Akio Horiguchi ◽  
Keiichi Ito ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Heat Resistance ◽  
Cancer Cells ◽  
Cyclooxygenase 2 ◽  
Prostate Cancer Cells

HEAT RESISTANCE OBTAINING AND SEARCH OF DIRECTIONALLY CRYSTALLIZED EUTECTIC Ni3Al - Ni3Nb - Ni3Тa

2018 ◽  
Vol 6 (25) ◽  
pp. 86-92
Author(s):  
V.A. Alikhanov ◽  
◽  
M.V. Khudoyan ◽  
Keyword(s):  
Heat Resistance

Reasons for the formation of crack-like defects in 09Г2С heavy plate steel for tank steel structures

2020 ◽  
Vol 10 (5) ◽  
pp. 479-489
Author(s):  
Vitaly М. Goritsky ◽  
◽  
Georgy R. Shneyderov ◽  
Eugeny P. Studenov ◽  
Olga A. Zadubrovskaya ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Defect Formation ◽  
Steel Structures ◽  
Controlled Rolling ◽  
Plate Steel ◽  
Heavy Plate ◽  
Oil Storage ◽  
Magnetic Inspection ◽  
Metal Microstructure

Determination of causes of crack-like defects in the heavy plate steel 09Г2С is a crucial task, the solution of which is aimed at improving the mechanical safety of oil storage steel vertical tanks. In order to determine the causes for the formation of a group of crack-like defects oriented towards rolling, revealed during grinding and magnetic inspection of the tank wall surface near the vertical weld, the analysis of the chemical composition and testing of the mechanical properties of heavy plate steel were carried out, including the determination of the anisotropy of impact toughness in the temperature range from +20 to –75 °С, analysis of metal microstructure in the area of defect formation on transversal sections and rolled surface. Impact bending tests of 09Г2С heavy plate steel after controlled rolling in longitudinal and transverse directions showed no anisotropy of impact toughness, as well as high purity of steel as for sulfur and titanium, which at higher content causes impact toughness anisotropy. The revealed features of metal microstructure near the defects made it possible to conclude that the crack-like defects were formed during the rolling of gas bubbles at the stage of preparing semi-finished rolled products for finishing rolling. One of the possible methods to prevent such defects from getting into finished rolled products is the use of automated systems of visual inspection of rolled products in the manufacturing process.

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