Structure of copolymers of ω-dodecalactam and ϵ-caprolactam

Frunze, T. M.; Cherdabayev, A.Sh.; Shleifman, R.B.; Kurashev, V.V.; Tsvankin, D.Ya.

doi:10.1016/0032-3950(76)90284-7

Cited by 14 publications

(9 citation statements)

References 4 publications

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“…The minimum crystallinity was obtained for the copolymer prepared at the feed ratio of 65/35 mol ratio of LL/CL. By increasing LL fraction up to 60 mol%, a reduction in crystallinity content was observed, which is in agreement with reports on the crystallization behavior, thermal transition and crystalline characteristics of CL/LL copolymers . Garner and Fasulo also reported a reduction in the melting point with increasing LL content in the copolymerized samples.…”

Section: Thermal Analysis and Crystal Structuressupporting

confidence: 90%

“…The studies on these random or block structures by direct structural analysis techniques, such as X-ray [54] diffractometry, 13 CNMR, and IR analysis or by determination of the number of melting points through differential scanning calorimetry (DSC) analysis have been reported [9,27,28,30,31,42,43,48,[55][56][57][58]. IR absorption spectra are also capable of showing polyamides characteristic band absorption [7,42,48,59].…”

Section: Characterizationmentioning

confidence: 99%

“…, Frunze et al . , and Godovskii et al . , who particularly focused on copolyamide 6/12 (nylon 6/12).…”

Section: Introductionmentioning

confidence: 99%

“…The anionic copolymerization of different lactam pairs and the properties of their copolyamide have been examined by many researchers since 1960s [17][18][19][20][21][22][23][24] and anionic copolymerization of CL with ω-laurolactam (LL) which are industrially available lactams, has been a frequently explored field of study during the recent decades. Some preliminary work in this field has been done by Kubota and Nowell [25], Šimůnková et al [26], Frunze et al [27,28], and Godovskii et al [29], who particularly focused on copolyamide 6/12 (nylon 6/12).…”

Section: Introductionmentioning

confidence: 99%

“…However, the advantages of CL anionic copolymerization along with LL predominate over its disadvantages. The most important benefits of these copolymers include excellent mechanical properties (especially tensile strength), low moisture absorption, low melting point, and acceptable chemical resistance among others [1,6,25,26,28,29].…”

Section: Introductionmentioning

confidence: 99%

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Anionic copolymerization of nylon 6/12: A comprehensive review

Mohammadi

Ahmadi

Ghasemi

et al. 2019

Polymer Engineering & Sci

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This review aims to provide a concise insight into the rapidly growing anionic ring‐opening copolymerization of nylon 6/12 and its related structures. This study analyzes the relationship between the structures of polymerization components and the relevant properties to achieve optimum copolymerization formulation. Specific emphasis is placed on how the catalyst type and temperature influence the final copolymer structure. The present work reviews available literature about nylon 6/12 synthesis published between 1960 and 2017 and investigates structures linked to polymerization mechanisms behind them. Moreover, experimental results derived from direct/indirect identification methods of structures are presented. The crystalline morphology of different structures was also evaluated. The thermal behaviors of synthesized copolymers are explored comprehensively. Finally, mechanical properties alteration and enhanced water absorption results are reported. POLYM. ENG. SCI., 59:1529–1543 2019. © 2019 Society of Plastics Engineers

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Section: Thermal Analysis and Crystal Structuressupporting

confidence: 90%

Section: Characterizationmentioning

confidence: 99%

“…, Frunze et al . , and Godovskii et al . , who particularly focused on copolyamide 6/12 (nylon 6/12).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Anionic copolymerization of nylon 6/12: A comprehensive review

Mohammadi

Ahmadi

Ghasemi

et al. 2019

Polymer Engineering & Sci

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Crystallographic Data and Melting Points for Various Polymers

Miller

1999

The Wiley Database of Polymer Properties

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The effect of composition on the properties of nylon 612 copolymers

Garner

Fasulo

1988

J of Applied Polymer Sci

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SynopsisThe series of nylon 612 copolymers was synthesized from caprolactam (C) and laurolactam (L) a t 145°C. The 50/50 C/L molar ratio copolymer was found to have the minimum melting temperature (T,) for the series. The glass transition temperatures (Tg's) of the copolymers were affected by the crystallinity of the copolymers. The T ' was at a minimum for the 50/50 copolymer for crystalline samples. However, for amorphous samples there was a decrease in Tg with increasing L content. Percent crystallinity was determined by differential scanning calorimetry and X-ray techniques. I t was found that the degree of crystallinity was at a minimum for copolymers of 70/30 to 40/60 C/L ratios. Coefficients of linear thermal expansion (CLTE) were obtained for the copolymers at 10°C intervals from 20 to 70°C for dry and from 20 to 50°C for samples conditioned at 50% relative humidity and 50°C. The dry samples gave lower initial values, but had a greater temperature dependence than the conditioned samples. As expected, the CLTE was found to be lowest for samples exhibiting the highest crystallinity. The tensile strengths and moduli decreased rapidly with increasing L up to the 70/30 C/L ratio after which they remained relatively constant. Elongations reached maximums between 70/30 and 40/60 C/L ratios. An inverse relationship was found between crystallinity and impact strength.

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Structure of copolymers of ω-dodecalactam and ϵ-caprolactam

Cited by 14 publications

References 4 publications

Anionic copolymerization of nylon 6/12: A comprehensive review

Anionic copolymerization of nylon 6/12: A comprehensive review

Crystallographic Data and Melting Points for Various Polymers

The effect of composition on the properties of nylon 612 copolymers

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