Synthesis and nonisothermal crystallization kinetics of thermoplastic polyamide‐6 elastomers

Huang, Juncheng; Lan, Jianwu; Song, Lin; Guo, Li; Gu, Long

doi:10.1002/app.47388

Cited by 11 publications

(19 citation statements)

References 57 publications

(63 reference statements)

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“…Li-Kun Xiong et al [9] prepared cationic dyeable polyamide 6 fibre by using 5-sulfoisophthalic acid monosodium salt as a blocking agent and melt polymerization with polyethylene glycol. Juncheng Huang and Ruchao Yuan et al [10,11] prepared a polyamide 6 elastomer by using adipic acid and terephthalic acid as blocking agents and esterification of polytetrahydrofuran under melt conditions, respectively. However, in the process of caprolactam hydrolysis polymerization, approximately 8%–10% of oligomers are inevitably formed, also known as hot water extractables [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthetic Strategy for Preparing Polyamide 6 (PA6)-Based Polymer with Transesterification

Zhang

Tang

et al. 2019

Polymers

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In the polymerization of caprolactam, the stoichiometry of carboxyl groups and amine groups in the process of melt polycondensation needs to be balanced, which greatly limits the copolymerization modification of polyamide 6. In this paper, by combining the characteristics of the polyester polymerization process, a simple and flexible synthetic route is proposed. A polyamide 6-based polymer can be prepared by combining caprolactam hydrolysis polymerization with transesterification. First, a carboxyl-terminated polyamide 6-based prepolymer is obtained by a caprolactam hydrolysis polymerization process using a dibasic acid as a blocking agent. Subsequently, ethylene glycol is added for esterification to form a glycol-terminated polyamide 6-based prepolymer. Finally, a transesterification reaction is carried out to prepare a polyamide 6-based polymer. In this paper, a series of polyamide 6-based polymers with different molecular weight blocks were prepared by adjusting the amount and type of dibasic acid added, and the effects of different control methods on the structural properties of the final product are analyzed. The results showed that compared with the traditional polymerization method of polyamide 6, the novel synthetic strategy developed in this paper can flexibly design prepolymers with different molecular weights and end groups to meet different application requirements. In addition, the polyamide 6-based polymer maintains excellent mechanical and hygroscopic properties. Furthermore, the molecular weight increase in the polyamide 6 polymer is no longer dependent on the metering balance of the end groups, providing a new synthetic route for the copolymerization of polyamide 6 copolymer.

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Section: Introductionmentioning

confidence: 99%

A Novel Synthetic Strategy for Preparing Polyamide 6 (PA6)-Based Polymer with Transesterification

Zhang

Tang

et al. 2019

Polymers

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“…Mo's modified Avrami equation is currently considered a good method for analyzing the nonisothermal crystallization kinetics of polymers . Mo combines Ozawa and Avrami equations present an effective dynamic equation about cooling rate and time:

\log Z_{t} + n \log t = \log normalK ((), T) - m \log normalΦ

and eq. can be expressed as:

\log normalΦ = \log F ((), T) - normalα \log t

where α = n / m is the ratio of Avrami index n to ozawa index m , Φ is the cooling rate, t is the crystallization time, Z t is the crystallization rate constant, and F ( T ) = [ k ( T )/ Z t ] 1/ m is the cooling rate value that must be selected per unit crystallization time when the measured sample reaches a certain crystallinity.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the parameter F ( T )) has clear physical and practical significance for nonisothermal crystallization. At a given relative crystallinity, the values of α and F ( T )) can be obtained from the slope and intercept of the log Φ versus log t curve …”

Section: Resultsmentioning

confidence: 99%

Synthesis and nonisothermal crystallization kinetics of biodegradable poly(ethylene terephthalate‐co‐ethylene succinate)s

Guan

Zhan

et al. 2019

J of Applied Polymer Sci

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In the current work, a series of biodegradable poly(ethylene terephthalate-co-ethylene succinate)s (P[ET-co-ES]s) were prepared via a traditional melting polycondensation method. First of all, the structures of prepared copolymers were characterized by nuclear magnetic resonance and Fourier transform infrared measurements. Meanwhile, the thermal properties of prepared samples were analyzed by differential scanning calorimetry and thermogravimetric analysis measurements, respectively. Subsequently, the mechanical properties of the P(ET-co-ES)s were evaluated, the tensile strength of P(ET-co-ES)s decreased with increasing of PES content in copolymer, however, corresponding P(ET-co-ES)s exhibited better elongation at break. Next, the biodegradability of P(ET-co-ES)s was evaluated using lipase as degrading enzyme. The results presented that the biodegradability of P(ET-co-ES)s improved with PES content, the corresponding results were supported by scanning electron microscopy test. Finally, the Mo's modified Avrami equation was employed to analyze the nonisothermal crystallization kinetics of prepared copolymers. The results showed the addition of the PES component improved the crystallization properties of the prepared P(ET-co-ES)s.

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“…This way, synthesis, crystallization, and thermal decomposition processes of various materials (with accompanying phase transitions) are, subsequently, studied using, for example, thermogravimetry. [4][5][6]…”

Section: Introductionmentioning

confidence: 99%

“…The number of batch experiments may be reduced to produce three curves, if we run them in nonisothermal conditions. This way, synthesis, crystallization, and thermal decomposition processes of various materials (with accompanying phase transitions) are, subsequently, studied using, for example, thermogravimetry 4–6 …”

Section: Introductionmentioning

confidence: 99%

Kinetics of esterification of the levulinic acid with n‐hexanol, n‐octanol, and 2‐ethylhexanol in the presence of methanesulfonic acid as a catalyst under nonisothermal conditions

Hamryszak

Grzesik

2020

Int J of Chemical Kinetics

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The levulinic acid was esterified with alcohol at an alcohol to acid molar ratio of 3:1, 5:1, and 10:1 in the presence of a 0.1 wt% methanesulfonic acid catalyst. During esterification, the temperature was changed linearly from 373 to 428 K and its average change was 4.5 K/min. The authors stated that reactions were of second order and that the activation energy (E) decreased from 61 to 46 kJ/mol in the following alcohol sequence: n-hexanol > n-octanol > 2-ethylhexanol. The fitting errors varied between 3.8% and 6.4%. The time of experiment carried out under nonisothermal condition is five to 15 times shorter than that conducted under isothermal conditions. A smaller number of experimental series also determines a significantly lower cost of such research. The results of such study are the precise form of the kinetic equation, which is indispensable in design and optimization of industrial-scale chemical reactors.

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Synthesis and nonisothermal crystallization kinetics of thermoplastic polyamide‐6 elastomers

Cited by 11 publications

References 57 publications

A Novel Synthetic Strategy for Preparing Polyamide 6 (PA6)-Based Polymer with Transesterification

A Novel Synthetic Strategy for Preparing Polyamide 6 (PA6)-Based Polymer with Transesterification

Synthesis and nonisothermal crystallization kinetics of biodegradable poly(ethylene terephthalate‐co‐ethylene succinate)s

Kinetics of esterification of the levulinic acid with n‐hexanol, n‐octanol, and 2‐ethylhexanol in the presence of methanesulfonic acid as a catalyst under nonisothermal conditions

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