Rheological Properties of Polyamide: Experimental Studies and Constitutive Modeling

Suchocki, Cyprian; Molak, Rafał M.

doi:10.1007/s10118-019-2180-9

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…As an extension of our previous works on polyamides (homopolymers and copolymers) [40][41][42][43][44][45][46], polyamide 1012 (PA1012) is used as a model polymer in this study. It is a typical AABB-type polyamide with long methylene chain segments between two neighbor amide groups, which is polymerized by a condensation reaction between diacid and diamine.…”

Section: Introductionmentioning

confidence: 99%

The origin of memory effects in the crystallization of polyamides: Role of hydrogen bonding

Liu

Wang

et al. 2020

Polymer

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Section: Introductionmentioning

confidence: 99%

The origin of memory effects in the crystallization of polyamides: Role of hydrogen bonding

Liu

Wang

et al. 2020

Polymer

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“…A numerical study provided the necessary process modeling data to give insight into the injection molding process. Previous reports include using experimental data to predict rheological properties [ 37 ], compression molding [ 38 ], and aging behavior [ 39 ] of neat PA66, as well as non-linear damage model [ 40 ] and low-velocity impact behavior [ 41 ] of glass fiber reinforced PA66. However, to the best of our knowledge, this is the first study to link numerical data to experimental work for investigating the injection molding behavior of GNPs in the PA66 matrix as well as their effect of orientation on the mechanical and rheological properties of PA66/GNP composites.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Flow and Alignment Behavior of Waste Tire-Derived Graphene Nanoplatelets in PA66 Matrix during Melt-Mixing and Injection

Dericiler

Sadeghi

Yağcı³

et al. 2021

Polymers

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Homogeneous dispersion of graphene into thermoplastic polymer matrices during melt-mixing is still challenging due to its agglomeration and weak interfacial interactions with the selected polymer matrix. In this study, an ideal dispersion of graphene within the PA66 matrix was achieved under high shear rates by thermokinetic mixing. The flow direction of graphene was monitored by the developed numerical methodology with a combination of its rheological behaviors. Graphene nanoplatelets (GNP) produced from waste-tire by upcycling and recycling techniques having high oxygen surface functional groups were used to increase the compatibility with PA66 chains. This study revealed that GNP addition increased the crystallization temperature of nanocomposites since it acted as both a nucleating and reinforcing agent. Tensile strength and modulus of PA66 nanocomposites were improved at 30% and 42%, respectively, by the addition of 0.3 wt% GNP. Flexural strength and modulus were reached at 20% and 43%, respectively. In addition, the flow model, which simulates the injection molding process of PA66 resin with different GNP loadings considering the rheological behavior and alignment characteristics of GNP, served as a tool to describe the mechanical performance of these developed GNP based nanocomposites.

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“…The rheological property of polymeric materials at molten state is crucial to gain a fundamental guide for the relationship between structure and property. [ 38 ] The steady‐state shear viscosity curves for PA6, PA6/KYN818‐1.2% and PA6/CuI‐0.8% with aging time were shown in Figure 5A‐C, respectively. Before aging (0 hour), the addition of CuI/KI or KYN818 reduces the viscosity of PA6 (Figure 5D).…”

Section: Resultsmentioning

confidence: 99%

New insight into the thermal‐oxidative stability of polyamide 6: A comparison investigation on the effect of hindered amine and CuI/KI

Wen

et al. 2020

Polymer Engineering & Sci

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Polyamide 6 (PA6) and stabilized PA6 with two different thermal stabilizers, (ie, metal salts CuI/KI and hindered amine KYN818 [1,3‐benzendicarboxamide,N,N'‐bis(2,2,6,6‐tetramethyl‐4‐piperidinyl)]) were separately prepared by melt blending and then aged for different time. The effects of aging temperature and aging time on crystallization behaviors of PA6 and stabilized PA6 were systematically investigated by differential scanning calorimetry and X‐ray diffraction. The variations of melting temperature, crystallinity and 2θ values suggest that aging under high temperature will accelerate the formation of crystals initially and then the degradation of molecular chains. The yellowness index and maximum decomposition temperature of stabilized PA6 are higher than that of PA6, which is dominated by different aging mechanisms and properties of stabilizers. In addition, the viscosity of all systems is increased at the preliminary stage, which is caused by the crosslinking network and the post‐polycondensation. The results of dynamic mechanical analysis showed that the glass transition temperature (Tg) decreases because the degradation of molecular chains during the aging process. Moreover, the carbonyl index for stabilized PA6 is lower than PA6, indicating the degradation is hindered by stabilizers. A comparison of the stabilization performance between CuI/KI and KYN818 was investigated to differentiate the long‐term stabilizing efficiency.

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Rheological Properties of Polyamide: Experimental Studies and Constitutive Modeling

Cited by 7 publications

References 16 publications

The origin of memory effects in the crystallization of polyamides: Role of hydrogen bonding

The origin of memory effects in the crystallization of polyamides: Role of hydrogen bonding

Experimental and Numerical Investigation of Flow and Alignment Behavior of Waste Tire-Derived Graphene Nanoplatelets in PA66 Matrix during Melt-Mixing and Injection

New insight into the thermal‐oxidative stability of polyamide 6: A comparison investigation on the effect of hindered amine and CuI/KI

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