✦ LIBER ✦

Anionic copolymers of caprolactam with laurolactam (nylon 612 copolymers) II. Crystallisation, glass transitions and tensile properties

✍ Scribed by I. Goodman; A.H. Kehayoglou

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 354 KB
Volume: 19
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(83)90167-2

No coin nor oath required. For personal study only.

✦ Synopsis

The crystalline of PCL/PLL random copolymers, prepared by anionic polymerisation in the melt and freed of residual monomer(s), vary with composition and are at a minimum for approx. 65.,"35 mole°,o composition. The Tg's of the copolymers show a minimum with composition; this effect is discussed in relation to the different co-unit compositions of the crystalline and the amorphous phases. The copolymers are tough thermoplastics with values of yield stress, stress at 100~i~ elongation, and modulus all tending to a minimum for the compositions of lowest crystallinity and highest birefringence. The tensile strengths at break are independent of crystallinity and vary linearly with NH(CH2)sCO unit content.

📜 SIMILAR VOLUMES

Anionic copolymers of caprolactam with l

Anionic copolymers of caprolactam with laurolactam (nylon 6/12 copolymers)—I. Preparation and general properties

✍ A.H. Kehayoglou 📂 Article 📅 1983 🏛 Elsevier Science 🌐 English ⚖ 440 KB

Copolyamides ofhigh mol.wt were obtained by the anionic copolymerisation of E-caprohtctam with ,)-laurolactam at 180 C. using a sodium caprolactamate-N-phenylcarbamoylcaprolactam initiator activator system. The proportions of co-units in the copol',mers were close to those in the comonomer feeds. Th

Anionic copolymers of octanelactam with

Anionic copolymers of octanelactam with laurolactam (nylon-8/12 copolymers): 3. Glass transitions, heats of fusion, crystallinity and specific heats

✍ Aristides H. Kehayoglou; Ioannis Arvanitoyannis 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 374 KB

Copolymers of anionic polymerization of

Copolymers of anionic polymerization of octanelactam with laurolactam (nylon-8/12 copolymers)—I. Preparation and general properties

✍ A.H. Kehayoglou; I. Arvanitoyannis 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 546 KB

Copolyesteramides—II. Anionic copolymers

Copolyesteramides—II. Anionic copolymers of ε-caprolactam with ε-caprolactone. Preparation and general properties

✍ I. Goodman; R.N. Vachon 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 656 KB

The N-sodiocaprolactam-catalysed anionic polymerisation of e-caprolactam is activated by e-caprolactone which itself acts as a comonomer, yielding copolyesteramides. At lower temperatures and lower catalyst concentrations, copolymerisation of the lactone is favoured over that of lactam; higher tempe