Mechanical Properties of Racemic Poly(α-methyl-α-n-propyl-β-propiolactone)

Noah, Joseph; Prud’homme, Robert E.

doi:10.1021/ma60070a037

Cited by 6 publications

References 4 publications

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Miscible binary blends containing the polyhydroxy ether of bisphenol‐a and various aliphatic polyesters

Harris

Goh

Paul

et al. 1982

J of Applied Polymer Sci

134

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SynopsisBlends of the polyhydroxy ether of bisphenol-A, Phenoxy, with the polyesters poly( 1,4-butylene adipate), poly(ethy1ene adipate), poly(2,2-dimethyl-l,3-propylene succinate), poly(2,2-dimethyl-l, 3-propylene adipate), poly(l,4-cyclohexane-dimethanol succinate), and poly(c-caprolactone), are found to exhibit the single, composition-dependent glass transition temperatures characteristic of miscible systems. Phenoxy blends containing poly(ethy1ene succinate), poly(hexamethy1ene succinate), or poly(pivalolactone) were found to be immiscible. Blend interaction parameters, obtained from analysis of the melting-point depressions observed for miscible blends containing crystallizable polyester components, are found to vary with polyester chemical structure so as to suggest an optimum density of ester groups in the polyester chain for achieving maximum interaction with Phenoxy. Too many or too few ester groups lead to immiscible polyester-Phenoxy blends.

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Miscible binary blends containing the polyhydroxy ether of bisphenol‐a and various aliphatic polyesters

Harris

Goh

Paul

et al. 1982

J of Applied Polymer Sci

134

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Propriétés viscoélastiques de la poly(α,α‐diéthyl‐β‐propiolactone)

Noah

Prud’homme

1980

Makromol. Chem.

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The viscoelastic properties of poly(a,a-diethyl-/3-propiolactone) were investigated in the linear range using stress relaxation and dynamic mechanical methods. Using Ferry's reduction method, a horizontal shift factor was determined at each temperature, that satisfactorily agreed with the WLF equation in the transition zone. No vertical shift was required to superimpose different relaxation curves. The apparent activation energy was temperature dependent and passed through a maximum near Tg whose value is (31 1 + 2) K. The relaxation spectrum has been calculated according to the first method of approximation of Schwarzl and Staverman. It consists of a high intensity plateau at shorter times, a wedge type portion with a slope of -0,15 and a low intensity plateau at longer times. Dynamical mechanical measurements revealed a p relaxation peak at 333 K and yielded the evidence of a y peak around 120 K. a) Poly(oxydimtthyl-2,2 0x0-1 trimkthylhe). b, Poly(oxydiL.thy1-2,2 0x0-1 trimtthylhe).

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Preparation, characterization, and porperties of optically active poly(α‐methyl‐α‐ethyl‐β‐propiolactones)

Grenier¹,

Prud’homme²,

Leborgne³

et al. 1981

J. Polym. Sci. Polym. Chem. Ed.

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S(−) and R(+) enantiomers of α‐methyl‐α‐ethyl‐β‐propiolactone (MEEPL) were prepared in an eight‐step synthesis with respective optical purities of 99 and 97% determined by 1H‐NMR (250 MHz) spectroscopy. Polymers (PMEPL) of different enatiomeric compositions were prepared with an anionic‐type initiator. Substantial differences in physical properties were observed between the racemic and optically pure polymers; for example, the melting point of the latter is 42°C higher than that of the former. Chiroptical properties of PMEPLs are reported. The 13C‐NMR (100.62 MHz) spectra of the polymers indicated that the distribution of configurational units in the macromolecular chain is random.

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Mechanical Properties of Racemic Poly(α-methyl-α-n-propyl-β-propiolactone)

Cited by 6 publications

References 4 publications

Miscible binary blends containing the polyhydroxy ether of bisphenol‐a and various aliphatic polyesters

Miscible binary blends containing the polyhydroxy ether of bisphenol‐a and various aliphatic polyesters

Propriétés viscoélastiques de la poly(α,α‐diéthyl‐β‐propiolactone)

Preparation, characterization, and porperties of optically active poly(α‐methyl‐α‐ethyl‐β‐propiolactones)

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