Shanzhi Yan

University of Connecticut

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i-10 index

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Yiwu Quan

Nanjing University

Jia Shi

Tsinghua University

Hao Dong

Nanjing University

Xuewen Guo

Nanjing University

Yun Gao

Sichuan University

Samuel J. Huang

Marshfield Clinic

Dengchao Jiang

Nanjing University

Lei Chen

Jiangsu University of Science and Technology

Julian F. Johnson

The Ohio State University

D. H. Damon

University of Connecticut

Cooperative Institutions

Nanjing University

Shanghai University

University of Connecticut

State Key Laboratory of Pollution Control and Resource Reuse

Central South University

State Key Laboratory of Analytical Chemistry for Life Science

Beijing Institute of Petrochemical Technology

University of Utah

Dalian University of Technology

Shandong Provincial QianFoShan Hospital

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Realizing simultaneous high‐temperature strength and low‐temperature elongation in polyolefin elastomer toughened polypropylene via controlling the dispersed phase size

Journal of Applied Polymer Science (2022)

Lei Chen Bin Cao Xuewen Guo Yiwu Quan Shanzhi Yan

Abstract The properties of modified polypropylene (PP) materials are closely related to their phase structure. In this work, polyolefin elastomer (POE)‐toughened PP materials with different phase structures were designed by using various types of POEs (ethylene‐butene 710, 110, ethylene‐propylene 6202, ethylene‐octene 8200). Then, the effects of phase separation in PP/POE blends on both thermal and tensile properties as well as ultraviolet (UV) resistance were investigated. The results revealed that the POE type hardly affected the melt flow rate, melting or crystallization behavior of the modified PP samples. Moreover, scanning electron microscopy results showed that POE6202 had a smaller dispersed phase size in PP (0.1–0.5 μm), which improved the low‐temperature elongation at break. PP/POE110 blends with a larger microdomain (1–5 μm) had better high‐temperature tensile strength. Further, when toughened with POE110 and POE6202 simultaneously, modified PP had excellent low‐temperature elongation (272%@ −40°C) without sacrificing as much of its high‐temperature tensile strength (10.4 MPa@70°C). Finally, Electron Paramagnetic Resonance tests showed that the addition of amorphous POE decreased the intensity of free radicals generated in PP during irradiation and promoted their attenuation during decay. This indicated that the introduction of POE improved the UV resistance of PP.

Polyolefin

Polypropylene

Elongation

10.1002/app.53537

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Citations (8)

Effects of chlorinated polypropylene based-adhesives on the bonding performance of an epoxy core rod and polyolefin sheath for composite insulators

International Journal of Adhesion and Adhesives (2021)

Hao Dong Jia Shi Yiwu Quan Chen Chao Shanzhi Yan

Polyolefin

Polypropylene

Penetration (warfare)

10.1016/j.ijadhadh.2021.102954

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Citations (1)

Effect of morphology development on the low‐temperature tensile properties ofPP/POEblends

Journal of Applied Polymer Science (2022)

Kairui Wang Lei Chen Yun Gao Dengchao Jiang Yiwu Quan

Abstract The application of polypropylene (PP) is greatly restricted by its poor low‐temperature tensile properties. In this work, a polypropylene random copolymer ( r PP) and polypropylene/ethylene‐propylene‐diene monomer graft copolymer ( g PP) were used to improve the toughening effect of polyolefin elastomer (POE) on PP. The influences of this addition on the phase morphology, crystallization, and rheological and mechanical properties were investigated. The results revealed that r PP both reduced the size of PP spherulites and improved the interfacial cohesion of the PP/POE blend, which endowed the material with greater tensile properties and melt flow rate. The elongation at break of PP/POE/ r PP at 23, 0, −20, and −40°C was 400%, 221%, 205%, and 106%, respectively. These represented increases of more than 200% compared with those of PP/POE. The tensile strengths of PP/POE/ r PP were 15.0, 19.1, 21.5, and 27.4 MPa at 23, 0, −20, and −40°C, respectively, which were comparable to those of PP/POE. Finally, the effects of the injection molding process parameters on the mechanical properties and phase morphology of r PP‐modified PP/POE blends were studied.

Polypropylene

Elongation

Morphology

Polyolefin

10.1002/app.52192

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Citations (7)

Electric strength of XLPE containing acetophenone and other volatile substances

IEEE International Symposium on Electrical Insulation (2002)

Shanzhi Yan Kueiying Sheu D. H. Damon Samuel J. Huang Julian F. Johnson

Measurements have been made of the AC breakdown strength and the impulse breakdown strength of samples of XLPE (cross-linked polyethylene) to which known amounts of acetophenone, cumyl alcohol, alpha methyl styrene, and cumene were added. A Weibull analysis of the breakdown strengths shows that the presence of a small amount (less than 2 wt.%) of these substances has a small effect on the breakdown strength of unaged XLPE. All these substances have about the same effect: they increase the AC breakdown strength but decrease the impulse breakdown strength.< >

Cumene

Acetophenone

Dielectric strength

10.1109/elinsl.1990.109761

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Citations (5)

Evaluation of thermoplastic polyolefin materials for the hard shed of composite insulators

Journal of Applied Polymer Science (2020)

Jia Shi Hao Dong Yiwu Quan Chao Chen Shanzhi Yan

Abstract This article explores the possibility of using polyolefin materials for composite insulator sheds. The transfer component (silicone oil or erucamide) is added into a polyolefin material to improve its hydrophobic properties. Results show that the silicone oil‐modified polyolefin material (polyolefin‐S) exhibited an obvious hydrophobicity transfer property. When the equivalent salt deposit density and nonsoluble deposit density are 0.1 and 0.5 mg/cm 2 , respectively, the static contact angle increases from 75° to 87° as the silicone oil transfer time increases from 24 to 96 hr. Meanwhile, polyolefin‐S exhibits high mechanical strength, hardness, volume resistivity, and surface resistivity values of 21.4 MPa, 62.6 HD, 1.7 × 10 15 Ω m and 1.2 × 10 16 Ω, respectively. Moreover, polyolefin‐S shows excellent tracking and erosion resistance of 4.5 kV level in the inclined plane test. The results verify that the polyolefin material is a promising candidate material for the hard shed of composite insulators.

Polyolefin

Silicone oil

10.1002/app.49080

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Citations (11)