Process for controlling morphology and improving thermal-mechani

Details Process for controlling morphology and improving thermal-mechani Process for controlling morphology and improving thermal-mechani

1995-06-07

1997-07-15

Woodward, Ana

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525422, 525903, C08F28304

Patent

active

056484321

ABSTRACT:
In the process of the present invention, a non-polar, aprotic solvent is removed from an oligomer/polymer solution by freeze-drying in order to produce IPNs and semi-IPNs. By thermally quenching the solution to a solid in a short length of time, the size of the minor constituent-rich regions is greatly reduced as they are excluded along with the major constituent from the regions of crystallizing solvent. The use of this process sequence of controlling phase morphology provides IPNs and semi-IPNs with improved fracture toughness, microcracking resistance, and other physical-mechanical properties as compared to IPNs and semi-IPNs formed when the solvent is evaporated rather than sublimed.

REFERENCES:
patent: 5344894 (1994-09-01), Lubowitz et al.
patent: 5460746 (1995-10-01), Yamamoto et al.

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