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HERO ID
4436364
Reference Type
Journal Article
Title
A study on the preparation of UPE resins with different glycol molar patios and their physical properties: 2. Characteristics of liquid and cured UPE
Author(s)
Lee, SH; Park, TW; Lee, JO
Year
1999
Volume
23
Issue
6
Page Numbers
773-780
Web of Science Id
WOS:000084050300001
Abstract
In order to improve the mechanical properties of unsaturated polyester(UPE) resins, the UPE resins were fabricated using various glycols and characterized before and after curing. The UPE resins were prepared by condensation of mixtures (1 : 1 molar ratio) of phthalic anhydride(PA) and maleic anhydride(MA) with ethylene glycol(EG), propylene glycol(PG), diethylene glycol (DEG), dipropylene glycol (DPG), neopentyl glycol (NPG). The reactivity of the condensation was in the order of NPG>EG>DEG>PG>DPG. The opaque UPE resin with EG revealed phase separation in styrene monomer(SM) because of low solubility. Viscosities of the UPE resins decreased with increasing molecular weights of the glycols used. The gel-time of UPE resins tended to be increased with higher molecular weights of glycols. The UPE cured resins based on NPG and PG were found to improved hardness, water resistance, tensile strength and the flexural strength. The UPE resins of DEG or EG showed poor water resistance and low tensile elongation. Among the UPE resins prepared from various kinds of glycols, those of NPG and PG showed better mechanical properties.
Keywords
unsaturated polyester; viscosity; water resistance; mechanical properties
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OPPT
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Glycols
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