Shear girdling phenomenon in polymers

Pae, K. D.; Silano, A. A.

doi:10.1002/app.1978.070221027

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…In these polymerizations, a small amount of polyimide containing either pendant or terminal phenyl ester groups was dissolved in molten ε‐caprolactam before the addition of phenylmagnesium bromide (PhMgBr). The detailed synthetic route has been reported elsewhere 13, 14. In brief, graft copolymers were prepared by the incorporation of a phenyl ester group into the diamine monomer phenyl 3,5‐diaminobenzoate (PDB).…”

Section: Methodsmentioning

confidence: 99%

Structure and properties of polyimide‐g‐nylon 6 and nylon 6‐b‐polyimide‐b‐nylon 6 copolymers

Pae

2005

J of Applied Polymer Sci

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Polyimide-g-nylon 6 copolymers were prepared by the polymerization of phenyl 3,5-diaminobenzoate with several diamines and dianhydrides with a one-step method. The polyimides containing pendant ester moieties were then used as activators for the anionic polymerization of molten -caprolactam. Nylon 6-b-polyimide-b-nylon 6 copolymers were prepared by the use of phenyl 4-aminobenzoate as an end-capping agent in the preparation of a series of imide oligomers. The oligomers were then used to activate the anionic polymerization of -caprolactam. In both the graft and copolymer syntheses, the phenyl ester groups reacted quickly with caprolactam anions at 120°C to generate N-acyllactam moieties, which activated the anionic polymerization. All the block copolymers had higher moduli and tensile strengths than those of nylon 6. However, their elongations at break were much lower. The graft copolymers based on 2,2Ј-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and 2,2Ј-bis[4-(4-aminophenoxy)phenyl]propane displayed elongations comparable to that of nylon 6 and the highest moduli and tensile strengths of all the copolymers. The thermal stability, moisture resistance, and impact strength were dramatically increased by the incorporation of only 5 wt % polyimide into both the graft and block copolymers. The graft and block copolymers also exhibited improved melt processability.

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Section: Methodsmentioning

confidence: 99%

Structure and properties of polyimide‐g‐nylon 6 and nylon 6‐b‐polyimide‐b‐nylon 6 copolymers

Pae

2005

J of Applied Polymer Sci

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High strain‐rate shear deformation of a polyurethane elastomer subjected to impact loading

Gupta

1984

Polymer Engineering & Sci

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Experimental techniques have been developed to produce and measure large amplitude one dimensional compression and shear waves in a polyurethane elastomer (Solithane 113). Experimental measurements consisted of time‐resolved compression and shear amplitude measurements at different distances from the impact surface. The data were analyzed to provide compression and shear wave velocities, and the corresponding stress‐stain curves on the microsecond time scale. The ability to measure directly the high stain rate shear response is a new development and has provided interesting results. The shear modulus varies between 3 and 9 kbar for compressive stresses ranging between 2 and 14 kbar. In contrast, shear modulus values inferred from quasi‐static measurements of bulk and Young's modulus under static high pressure are negligible. These comparisons suggest a high rate dependence of shear modulus in the glassy state. The shear strain curves suggest an elastic‐plastic response with yield strengths ranging from 0.12 kbar to 0.25 kbar with increasing compression for the compressive stress range investigated. Results of compression experiments are also presented.

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