Formation mechanism of penetration section of organic glass used for spherical observation windows

doi:10.19491/j.issn.1001-9278.2025.08.001

Abstract

Abstract:

In this study， injection⁃molded and blow⁃molded organic glass structural parts were investigated by analyzing their microscopic morphology， structure， and dynamic/static mechanical properties. Their cross⁃sections obtained from penetration fracture using a shaped cutting wire under different service environments were examined. The results indicated that injection⁃molded samples presented superior toughness and impact resistance， whereas blow⁃molded samples obtained higher mechanical strength. A two⁃stage failure mechanism was proposed， involving high⁃temperature⁃induced molecular chain degradation/fracture followed by shock⁃wave damage during particle penetration. This work provides insights for optimizing the molding process of organic glass structural parts and designing their service environments.

Key words: organic glass, poly（methyl methacrylate）, penetration fracture, impact damage, failure mechanism

CLC Number:

TQ317.6

DANG Shuaiying, GUO Chao, ZHAO Shuo, WEI Shen, ZHANG Yidu, LIU Yanping. Formation mechanism of penetration section of organic glass used for spherical observation windows[J]. China Plastics, 2025, 39(8): 1-5.

Figures/Tables 9

Fig.1. （a） Cross⁃sectional photo and （b） schematic diagram of the sampling position

Fig.2. PLM and SEM images of penetrating and fractured layers of the section

Fig.3. Stress⁃strain curves of the samples

力学性能	弹性模量/MPa	伸长率	吸收功/kJ	冲击韧性/kJ·m^-2
注塑	2 030.84	0.075	5.373	35.573
吹塑	2 162.98	0.061	5.405	32.461

Tab.1. Static （uniaxial tensile） and dynamic （pendulum impact） mechanical properties of the samples

Fig.4. DSC curves of the samples

样品	M0	M1	M2	M3	M4
IW	113	112	112	113	113
IA	—	112	110	—	—
BW	97	98	98	100	99
BA	97	99	98	100	99

Tab.2. Tg of the samples

Fig.5. TG curves of the samples

Fig.6. NMR transverse relaxation time curves

Fig.7. Schematic diagram of the penetration and fracture process of PMMA

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