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Elastomeric and Plastomeric Materials
Published in Narendra Pal Singh Chauhan, Functionalized Polymers, 2021
Mohsen Khodadadi Yazdi, Payam Zarrintaj, Saeed Manouchehri, Joshua D. Ramsey, Mohammad Reza Ganjali, Mohammad Reza Saeb
Plastomers that combine properties of elastomers with the processability of plastics are commonly considered equivalent to TPEs. However, sometimes the term “plastomer” is used for ethylene alpha-olefin (a-olefin) copolymers. Incorporation of low quantity of an a-olefin comonomer (e.g., 1-hexene and 1-octene) to common crystalline homopolymers (especially polyethylene or isotactic polypropylene) results in more amorphous structures in plastomers (D’orazio et al. 1982). Besides, a-olefin copolymers possess uniform composition, at both inter- and intramolecular scales (Mohammadi et al. 2014). Since the predominant monomer in plastomers is commonly ethylene or isotactic propylene, plastomers are categorized as E-plastomers and P-plastomers. The flexural modulus of plastomers is lower than that of commodity and engineering plastics. Packaging, both food and non-food, is the leading application of plastomers; besides, these copolymers are widely used to modify properties of polymers for various applications. The emerging class of plastomers consists of the newly developed bottlebrush elastomers, which are treated in this chapter. This chapter particularly deals with plastomers employed as TPEs including poly(ethylene/isotactic polypropylene-co-a-olefins) and bottlebrush elastomers (Bhowmick 2008 #288).
1 Properties of Electronic Packaging Materials
Published in Mitel G. Pecht, Rakesh Agarwal, Patrick McCluskey, Terrance Dishongh, Sirus Javadpour, Rahul Mahajan, Electronic Packaging: Materials and Their Properties, 2017
Mitel G. Pecht, Rakesh Agarwal, Patrick McCluskey, Terrance Dishongh, Sirus Javadpour, Rahul Mahajan
Flexural modulus (FM). The flexural modulus is the elastic modulus of a material determined from a bending test. Usually a three-point bending test is performed and the flexural modulus is computed as FM=Pl34δbh3
Polymers
Published in Bryan Ellis, Ray Smith, Polymers, 2008
Mechanical Properties General: Specific moduli are similar to those of aluminium. Has greater stiffness than for example, Nylon 6 and Nylon 6,6. Flexural modulus and flexural strength at break decrease with increasing temp. [2] and sample thickness [3]. Tensile storage modulus decreases with increasing temp. [4]
Effect of silica nanoparticles on mechanical properties of Kevlar/epoxy hybrid composites
Published in The Journal of The Textile Institute, 2019
Madeha Jabbar, Mehmet Karahan, Yasir Nawab, Munir Ashraf, Tanveer Hussain
The addition of fillers has also affected the flexural modulus of the hybrid composite materials (Figure 9). It has resulted in increased stiffness and higher flexural modulus. Although there is not a major shift in bending modulus at 8 and 12% loading rate. This can be explained in terms of dispersion and interfacial adhesion of fillers in the matrix. It can be concluded from the tensile and flexural behavior that the strength is strongly influenced by the interfacial adhesion, while modulus is more affected by the stiffness of its constituents (increase due to the incorporation of rigid particles).
Mechanical properties of particleboard made from leather shavings and waste papers
Published in Cogent Engineering, 2022
Tabitha Kibet, David, R. Tuigong, Obadiah Maube, Josphat I. Mwasiagi
From the graph, the MOE decreased with increase in resin content. Factors which affected the flexural strength also affected the flexural modulus in the same manner since flexural modulus is a function of flexural strength (Durowaye et al., 2014). Therefore, as the resin content was increased from 60 wt% to 90 wt%, the flexural modulus was reduced from 5.03 GPa to 3.054 GPa. Increase in resin content could have created defects due to an incomplete cure of the matrix and void (places unfilled by matrix and particles) reducing restraint strength, thus leading to lower MOE (Nurul et al., 2019).
Impact of waste fibers on the mechanical performance of concrete composites
Published in The Journal of The Textile Institute, 2020
Muhammad Imran Khan, Muhammad Umair, Khubab Shaker, Abdul Basit, Yasir Nawab, Muhammad Kashif
The flexural test measures the force required to bend a beam under three-point loading conditions. The data is often used to select materials for parts that will support loads without flexing. Flexural modulus is used as an indication of a material’s stiffness when flexed.