Uniaxial roll‐drawing of isotactic polypropylene sheet

Abstract

The process described as “roll‐drawing” has been applied to commercial extruded sheets of isotactic polypropylene (M̄n = 70,900). Preheated billets were drawn into thin, clear, transparent sheets in a single pass, producing uniaxial orientation of the polymer molecules in the draw direction. At the maximum draw ratio of 20, the ultimate tensile strength and Young's modulus in the draw direction were 0.5 GPa and 20 GPa respectively. The mechanical properties transverse to the draw direction were virtually unchanged. The theory of fiber reinforcement for unidirectional anisotropic plates was applied to interpret the orientation dependence of the stress‐strain behavior of the drawn sheets. From these results, it was estimated that the mechanical properties of biaxially laminated polypropylene sheets equaled the performance of aramid and carbon fiber composites, The roll‐drawing process appears to be economically attractive for the production of ultra‐high modulus crystalline thermoplastics in sheet form having excellent uniaxial or biaxial properties.

Orientation of amorphous poly(ethylene terephthalate) by tensile drawing, roll‐drawing, and die‐drawing

“…ing) of polyolefins (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). Although there are still many aspects that are not well understood, extending these techniques to engineering and specialty polymers as well as polymer blends will open up many opportunities.…”

“…In the case of polyesters, the most studied polymer is poly(ethy1ene terephthalate) (PET) because of its wide use in fibers, films, and bottles. We recently investigated the orientation of this polymer using solid state roll-drawing from the semicrystalline state ( 1 [1][2][3][4][5][6][7][8][9][10][11][12][13] as well as tensile drawing of amorphous films (14)(15)(16). However, the use of continuous solid state deformation processes to produce thick oriented transparent PET sheets was not investigated in any of these cases.…”

Nanoclay assisted ultra-drawing of polypropylene tapes

“…For example, higher molecular weight polymers exhibiting higher levels of entanglement densities, have shown to display a reduction in maximum draw ratio. Conversely, processing of polymers from a disentangled state as in the case of gel-spinning of polyethylene or polypropylene has shown to lead to [40] Solid-state drawn PP 19 19.0 450 Mao [41] Solid-state drawn PP 18 11.6 580 Chatterjee [42] Gradient drawing PP 17 16.4 670 Lee [43] Drawn PP sheets 14 7.5 250 Kristiansen [44] Gel-spun PP 60 36.2 1010 Matsuo [45] Gel-spun PP -40.4 1560 Joshi [46] Solid-state drawn PP/0.5%MMT 14 15.5 730 Deng [22] Solid-state drawn PP/0.25%CNT 22 16.5 600 Bilotti [23] Solid-state drawn PP/2.5%Sep 20 16.0 550 Luijsterburg [24] Solid very high draw ratios [5]. By adding 2D nanoplatelets such as montmorillonite clays, an enormous amount of surface area is created in the nanocomposite.…”

Fine structure and physical properties of poly(butylene terephthalate) sheets prepared by roll drawing

“…The roll drawing process in solid phase [9] promises to become the lowest cost approach for the production of ordered plastics and has the virtue of being applicable to most commercial thermoplastic resins. Of course, the solid phase processing is a well-known process in the packaging industry, where it has been used extensively for the mass production of rigid containers and bottles for many years.…”