Effect of multistage tensile extrusion induced fiber orientation on fracture characteristics of high density polyethylene/short glass fiber composites

He, Guansong; Li, Jiang; Zhang, Fengshun; Wang, Chao; Guo, Shaoyun

doi:10.1016/j.compscitech.2014.05.014

Cited by 32 publications

(10 citation statements)

References 32 publications

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“…As a result, yield strengths of the multistage stretching extruded samples were higher than those of compression molded ones. 35,36 Furthermore, elongations at break of the multistage stretching extruded samples were always much larger. This phenomenon was mainly attributed to the fact that the BN in the multistage stretching extruded samples was uniformly dispersed and highly oriented, which could significantly eliminate defects in the final composites.…”

Section: Resultsmentioning

confidence: 96%

Simple and Consecutive Melt Extrusion Method to Fabricate Thermally Conductive Composites with Highly Oriented Boron Nitrides

Zhang

Xia

et al. 2017

ACS Appl. Mater. Interfaces

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138

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In the region of thermally conductive polymer composites, forcing anisotropic fillers into the highly oriented structure is the most effective method to improve thermal conductivity and mechanical properties simultaneously. However, up to now, such highly oriented structure was mainly achieved in low viscosity polymer matrix or solutions. For the purpose of expanding the range of applications, in the present work, a new strategy, the consecutive and powerful shear flow field, was applied to introduce highly oriented boron nitride (BN) into high viscosity polymer matrix. Results indicated that BN was almost totally oriented along the extrusion plane; as a result, the anisotropic index and thermal conductivity of the composite filled with 40 wt % BN reached as high as 480% and 3.57 W/(m K), respectively. Furthermore, compared with the samples with randomly oriented BN, elongations at break were improved more than 50-fold at the same filler content. Finite element analysis was also applied to systematically investigate the effect of the orientation direction of BN on heat dissipation property of the composites, and results indicated that orienting the longitudinal direction of BN parallel to the heat source is the best way to reduce the heat source temperature to a low level. Therefore, the simple, consecutive, and environmentally friendly melt extrusion with powerful shear flow field is an outstanding method to fabricate high efficiency thermally conductive composites, and the simulative results also have important significance on designing such composites for different applications.

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Section: Resultsmentioning

confidence: 96%

Simple and Consecutive Melt Extrusion Method to Fabricate Thermally Conductive Composites with Highly Oriented Boron Nitrides

Zhang

Xia

et al. 2017

ACS Appl. Mater. Interfaces

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138

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“…The incorporation of materials as fillers and reinforcing agents to polyolefin (PO) polymers is a practice carried out with the aim of producing more durable products with an acceptable market longevity. Such a practice has been notably conducted in the past with wood fibres, short glass and polyesters, to produce various plastic composite blends [1,2]. These products perform various functions as commodity plastic products stretching from film applications to more engineered and tailored ones, such as insulators and protection surfaces.…”

Section: Study Of the Degradation Profile For Virgin Linear Low-densimentioning

confidence: 99%

Study of the degradation profile for virgin linear low-density polyethylene (LLDPE) and polyolefin (PO) plastic waste blends

Al–Salem

Behbehani

Al-Hazza’A

et al. 2019

J Mater Cycles Waste Manag

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In this study, the properties of virgin linear low-density polyethylene (LLDPE) and its blends with reclaimed plastic solid waste (PSW) are investigated by thermogravimetry, differential scanning calorimetry (DSC), infrared spectroscopy and scanning electron microscopy (SEM). The PSW constituted polyolefin (PO) polymers recycled mechanically via extrusion/blown-film and exposed to accelerated weathering tests to determine the change in their degradation behaviour. The oxidation products determined using the FTIR analysis and thermal stability studies points toward the blend constituting 25% of waste by weight as the most stable. Changes in crystallinity of the polymers were attributed to the crystal size change as a consequence of the weathering mechanism. The DSC results revealed that both oxidation induction temperature (OIT) and crystallinity were affected by the PO waste content. This points towards the impact of polymers immiscibility and polydispersity within the matrix of the blends due to chain scission reaction and oxidation with the UV exposure.

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“…By connecting the LMEs in series, the intensity of extensional and shearing field could increase exponentially (Scheme a). By far, the intense extensional and shearing field provided by LMEs has been verified to be effective in in situ fibrillation of the dispersed phase, , the orientation of high-aspect ratio fillers. − As aforementioned, the main purpose here is to strengthen and toughen PLA simultaneously by structuring a designed “assembly”. Hence, similar to the two-step melt spinning, , the extensional and shearing field offered by LMEs together with the elongational filed provide by the take-up device was imposed on the PLA melt (Scheme ).…”

Section: Introductionmentioning

confidence: 98%

In Situ Formation of Microfibrillar Crystalline Superstructure: Achieving High-Performance Polylactide

Jiang

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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As a biobased and biodegradable polyester, polylactide (PLA) is widely applied in disposable products, biomedical devices, and textiles. Nevertheless, due to its inherent brittleness and inferior strength, simultaneously reinforcing and toughening of PLA without sacrificing its biodegradability is highly desirable. In this work, a robust assembly consisting of compact and well-ordered microfibrillar crystalline superstructure (FCS) surrounded by slightly oriented amorphism, is achieved by a combined external force field. Unlike the classic crystalline superstructures such as shish-kebabs, cylindrites, and lamellae, the newfound FCS with diameter of about 100 nm and length of several tens of micrometers is aggregated with well-aligned crystalline nanofibers. FCS can serve as discontinuous fiber to self-reinforce the amorphous PLA; more importantly, FCS can also act as rivets to pin the propagating fibrillar crazes leading to the formation of dense fibrillar crazes during stretching, which dissipates much energy and translates the failure of PLA from brittle to ductile. Consequently, PLA with FCS exhibits exceptionally simultaneous enhancement in ductility, strength, and stiffness, outperforming normal PLA with increments of 728, 55, and 70% in elongation at break, strength, and modulus, respectively. Therefore, FSC exhibits competitive advantages in achieving high-performance PLA even for other semicrystalline polymers. More significantly, this newfound crystalline superstructure (FCS) provides a new structural model to establish the correlation between structure and performance.

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Effect of multistage tensile extrusion induced fiber orientation on fracture characteristics of high density polyethylene/short glass fiber composites

Cited by 32 publications

References 32 publications

Simple and Consecutive Melt Extrusion Method to Fabricate Thermally Conductive Composites with Highly Oriented Boron Nitrides

Simple and Consecutive Melt Extrusion Method to Fabricate Thermally Conductive Composites with Highly Oriented Boron Nitrides

Study of the degradation profile for virgin linear low-density polyethylene (LLDPE) and polyolefin (PO) plastic waste blends

In Situ Formation of Microfibrillar Crystalline Superstructure: Achieving High-Performance Polylactide

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