Simulation of mechanical properties of multilayered propylene–ethylene copolymer/ethylene 1-octene copolymer composites by equivalent box model and its experimental verification

Shen, Jiabin; Wang, Ming; Li, Jiang; Guo, Shaoyun; Xu, Shuangxi; Zhang, Yuqing; Li, Ting; Wen, Meicheng

doi:10.1016/j.eurpolymj.2009.07.013

Cited by 55 publications

(23 citation statements)

References 37 publications

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“…The greater number of interfaces between adjacent layers would presumably generate higher degrees of adhesive forces subsequently increasing overall matrix structural strength in comparison to Group 1. This conclusion is in line with previous studies which have demonstrated that shearing and elongation forces between laminates of synthetic co-polymer composites increase as a function of layer number [32]. Elongation to failure assessments demonstrated that Group 3 scaffolds displayed significantly higher values at 51 ± 6% in comparison to Groups 1 and 2 which exhibited 28 ± 3% and 25 ± 4%, respectively.…”

Section: Resultssupporting

confidence: 92%

The effect of manipulation of silk scaffold fabrication parameters on matrix performance in a murine model of bladder augmentation

et al. 2011

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Autologous gastrointestinal segments are utilized as the primary option for bladder reconstructive procedures despite their inherent morbidity and significant complication rate. Multi-laminate biomaterials derived from Bombyx mori silk fibroin and prepared from a gel spinning process may serve as a superior alternative for bladder tissue engineering due to their robust mechanical properties, biocompatibility, and processing plasticity. In the present study, we sought to determine the impact of variations in winding (axial slew rate: 2 and 40 mm/sec) and post-winding (methanol and lyophilization) fabrication parameters on the in vivo performance of gel spun silk scaffolds in a murine model of bladder augmentation. Three silk matrix groups with distinct structural and mechanical properties were investigated following 10 weeks of implantation including our original prototype previously shown to support bladder regeneration, Group 1 (2mm/sec, methanol) as well as Group 2 (40mm/sec, methanol) and Group 3 (40mm/sec, lyophilization) configurations. Non surgical animals were assessed in parallel as controls. Quantification of residual scaffold area demonstrated that while Group 1 and 2 scaffolds were largely intact, processing parameters utilized for Group 3 led to significantly higher degrees of scaffold degradation in comparison to Group 1. Histological (hematoxylin and eosin, masson’s trichrome) and immunohistochemical (IHC) analyses showed comparable extents of smooth muscle regeneration and contractile protein (α-smooth muscle actin and SM22α) expression within the original defect site throughout all matrix groups similar to controls. Parallel evaluations demonstrated transitional urothelial formation with prominent uroplakin and p63 protein expression supported by Group 1 and 3 scaffolds, while Group 2 variants supported a thin, immature epithelium composed primarily of uroplakin-negative, p63-positive basal cells. Voided stain on paper analysis revealed similar voiding patterns between all matrix groups; however Group 2 animals displayed substantially lower voided volumes with increased frequency in comparison to controls. In addition, cystometric assessments revealed all matrix groups supported comparable degrees of bladder compliance similar to control levels. The results of this study demonstrate that selective alterations in winding and post-winding fabrication parameters can enhance the degradation rate of gel spun silk scaffolds in vivo while preserving their ability to support bladder tissue regeneration and function.

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Section: Resultssupporting

confidence: 92%

The effect of manipulation of silk scaffold fabrication parameters on matrix performance in a murine model of bladder augmentation

et al. 2011

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“…The shear strain is mainly distributed in the constrained CIIR layers by PMMA layers, while low shear strain occurs in the outmost CIIR layer, which is essentially a free damping layer. It should be noted that such significant move of loss peak is not detected in other multilayered composites [16,20]. The reason is that the dynamic mechanical loss peak of CIIR shows a unique asymmetric structure, which involves three kinds of relaxation modes (local segmental motion, sub-Rouse modes and Rouse modes).…”

Section: Shear Strain Of the Multilayered Compositesmentioning

confidence: 83%

“…In recent years, an advanced processing technology, multilayered (or microlayered) co-extrusion, has been developed to prepare the stratified composite sheets with alternating polymer layers [16][17][18]. In our previous research [19,20], a new intermediate damping peak is found in PP/POE multilayered composites with the increase of the layer number, which improves the damping property of the composites. The mechanical analysis indicates that the origin of the additional transition is ascribed to the advanced defreezing of chain segments of iPP, which is caused by the stress difference between iPP and POE layers tend to reach the maximum around the temperature where the new loss peak appears.…”

Section: Introductionmentioning

confidence: 97%

Multilayered damping composites with damping layer/constraining layer prepared by a novel method

Zhang

Guo

et al. 2014

Composites Science and Technology

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“…Carbon-carbon composites are famous for high strength and light weight [21]. Again, the multi-layered composites have higher yield strength due to higher phase continuity [22]. Therefore, the present study discusses the preparation in multilayers by hand-lay-up method and the testing by ASTM standards of PAN carbon and epoxy laminates.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Testing of PAN Carbon/Epoxy Resin Composites

Patro¹,

Shashidhar²,

Rajeshwer³

et al. 2017

TOMEJ

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Background:Due to light weight, high performance and excellent mechanical properties, carbon fibers are considered a key material in the 21 st century. These are extensively used in many industries for structural usages, such as aerospace, aeronautical, sporting goods applications, and automotive and medical devices, due to their desirable strength to weight properties. Now, these are globally accepted as a high performance and high-strength material. Most of the carbon fibers are derived from polyacrylonitrile fiber precursor. These materials have the potential for fire hazards caused due to heat, smoke, and electric short circuit. Objective:To prepare polyacrylonitrile carbon and epoxy resin laminates in multilayers by hand-lay-up method and testing by ASTM (American Society for Testing and Materials) standards. Method:Polyacrylonitrile carbon fiber/epoxy resin composites are prepared using the hand-lay-up method. For the non-destructive testing, the ultrasonic type is used. For the destructive testing, a universal testing machine is used to test the tensile test, the flexural test and the inter-laminar shear stress test, as per the ASTM standard. Subsequently, the physical properties, such as the density test and the fiber content, the resin content and the void content tests of the laminate are carried out. Results:The experimental results show that the matrix laminates have good mechanical and physical properties. Conclusion:Preparation and testing of polyacrylonitrile carbon/epoxy resin composites are carried out and the prepared laminates exhibit good mechanical and physical properties. Hence, the laminates can be used in many industrial and commercial applications, as a composite material.

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Simulation of mechanical properties of multilayered propylene–ethylene copolymer/ethylene 1-octene copolymer composites by equivalent box model and its experimental verification

Cited by 55 publications

References 37 publications

The effect of manipulation of silk scaffold fabrication parameters on matrix performance in a murine model of bladder augmentation

The effect of manipulation of silk scaffold fabrication parameters on matrix performance in a murine model of bladder augmentation

Multilayered damping composites with damping layer/constraining layer prepared by a novel method

Preparation and Testing of PAN Carbon/Epoxy Resin Composites

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