Entanglement Density-Dependent Energy Absorption of Polycarbonate Films via Supersonic Fracture

被引：52

作者：

Chan, Edwin P. ^{[1
]}

Xie, Wanting ^{[2
,3
]}

Orski, Sara V. ^{[1
]}

Lee, Jae-Hwang ^{[3
]}

Soles, Christopher L. ^{[1
]}

机构：

[1] NIST, Mat Sci & Engn Div, Gaithersburg, MD 20899 USA

[2] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[3] Univ Massachusetts, Dept Mech & Ind Engn, Amherst, MA 01003 USA

来源：

ACS MACRO LETTERS | 2019年 / 8卷 / 07期

关键词：

SHEAR DEFORMATION; POLYMER; TEMPERATURE; TRANSITION; BEHAVIOR; MODEL;

D O I：

10.1021/acsmacrolett.9b00264

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The fracture behavior of glassy polymers is strongly coupled to molecular parameters such as entanglement density as well as extrinsic parameters such as strain rate and test temperature. Here we use laser-induced projectile impact testing (LIPIT) to study the extreme strain rate (approximate to 10(7) s(-1)) puncture behavior of free-standing polycarbonate (PC) thin films. We demonstrate that changes to the PC molecular mass and the degree of plasticization can lead to substantial changes in the specific puncture energy. We relate these changes to the alteration of the entanglement density of the polymer that determines the underlying failure mechanism as well as the size of the deformation zone.

引用

页码：806 / 811

页数：11

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