The effect of crystallization pressure on macromolecular structure, phase evolution, and fracture resistance of nano-calcium carbonate-reinforced high density polyethylene

被引：22
作者：
Yuan, Q. [1 ,2 ]
Yang, Y. [1 ,2 ]
Chen, J. [1 ,2 ]
Ramuni, V. [1 ,2 ]
Misra, R. D. K. [1 ,2 ]
Bertrand, K. J. [3 ]
机构：
[1] Univ Louisiana Lafayette, Ctr Struct & Funct Mat, Lafayette, LA 70504 USA
[2] Univ Louisiana Lafayette, Dept Chem Engn, Lafayette, LA 70504 USA
[3] Westlake Chem Corp, Sulphur, LA 70665 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 24-25期
关键词：
High density polyethylene (HDPE); Calcium carbonate; Pressure; Microstructure; Equilibrium melting point; Toughness; STRESS WHITENING BEHAVIOR; EPOXY-CLAY NANOCOMPOSITES; MECHANICAL-PROPERTIES; FILLED POLYPROPYLENE; SILICATE NANOCOMPOSITES; ISOTACTIC POLYPROPYLENE; IMPACT STRENGTH; SURFACE DAMAGE; DEFORMATION; POLYMER;
D O I：
10.1016/j.msea.2010.07.007
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We describe here phase evolution and structural changes that are induced when high density polyethylene (HDPE) containing dispersion of nano-calcium carbonate is isothermally crystallized in the pressure range of 0.1-100 MPa. To delineate and separate the effects of applied crystallization pressure from nanoparticle effects, a relative comparison is made between neat HDPE and HDPE containing nano-calcium carbonate under similar experimental conditions. X-ray diffraction studies point toward the evolution of monoclinic phase at high crystallization pressure together with the commonly observed orthorhombic phase of HOPE. Furthermore, the nucleation of monoclinic phase is promoted by nanoparticles even at low crystallization pressure. The equilibrium melting point is insignificantly influenced on the addition of nanoparticle, such that the crystallization pressure has no obvious effect. The strong thermodynamic interaction between nano-calcium carbonate and HDPE is supported by the shift in glass transition temperature and changes in the modification of absorption bands of HDPE in Fourier transform infrared (FTIR) spectrum. Furthermore, the reinforcement of HDPE with nano-calcium carbonate increases impact strength and alters the micromechanism from crazing-tearing in polyethylene to fibrillated fracture in polymer nanocomposite, such that the fibrillation increases with crystallization pressure. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：6699 / 6713
页数：15
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