The Influence of Process Conditions

Akutin (52) performed an exhaustive study on the influence of processing conditions and the nitrile rubber/poly(vinyl chloride) ratio on the mechanical characteristic of the product. The experiments were carried out in a Brabender Plastograph at 160-180° C and rotor speed of 10-50 rpm. The polyfvinyl chloride) molecular weight was 83500. A resin with an epoxy group content of 20.75% was added to the blend as plasticizer and stabilizer. Figure 29 shows that the... 

Consequently, in this study, the critical factors that were examined during process development involved establishing the influence of process conditions on ... 

J. Hauri, F. Escher, A. Denzler, and H. Neukom, The influence of processing conditions on the storage stability of drum-dried cereal flakes, Lebensm. Wiss. Technol., 1982, 15, 235-241. 

As can be seen from all of these works, sequential IPNs have been extensively used with silicone with various crosslinking reactions and polymers. As a result, attention must be paid to the influence of processing conditions, of the chemical nature of components (silicone and the other polymer), of the evolution of the material at each step of the IPN synthesis etc. Depending on the mastering of these parameters, reactivity, morphology and entanglement can be controlled and consequently targeted properties can be reached. 

Testing the influence of process conditions on stability and lifetime of particular membrane installation elements— the influence of salts that cause scaling (Na2S04, Na2C03, NaHCOa, Ca3(P04)2), the influence of radiation on membrane material... 

Renstadt, R. Karlsson, S. Albertsson, A. C. The influence of processing conditions on the properties and the d radation of poly(3-hydroxybutyrate-co-3-hydroxyvaler-ate). Macromol. Symp. 1998,127, 241—249. 

Janssen, L. J. J. M. Boersma, A. te Nijenhuis, K. Encapsulation by interfacial polycondensation. III. Microencapsulation the influence of process conditions on wall permeability. Journal of Membrane Science (1993), 79(1), 11-26. 

For simulation purposes and process control, the material behaviour is usually described by the help of complex physical viscoelastic models [34], where the influence of processing conditions (e.g. temperature, pressure, material output) as well as material properties (elasticity, strength, etc.) affected by molecular structure play crucial role. 

The tremendous advances that have occurred in the spectroscopic analysis of the electrode/electrolyte interface have begun to provide a fundamental understanding of the elementary processes and the influence of process conditions. Surface-sensitive spectroscopic and microscopic analyses such as surface-enhanced Raman scattering (SERS) [1], potential-difference infrared spectroscopy (PDIRS) [2], surface-enhanced infrared spectroscopy (SEIRS) [3], sum frequency generation (SFG) [4], and scanning tunneling microscopy (STM) [5,6] have enabled the direct observation of potential-dependent changes in molecular structure [2,7] chemisorption [8,9], reactivity [10], and surface reconstruction [11]. 

Renstadt, R., Karlsson, S., Albertsson, A. C. (1998). The Influence of Processing Conditions on the Properties and the Degradation of Poly(3-hydroxybutyrate-co3-hydroxyvalerate). Macromol Symp, 127,241-249. 

The aim of the study was to use NMR to investigate the protective mechanism of sorbitol during vacuum drying of a probiotic test microorganism L. paracasei ssp. paracasel). Therefore, H mobility and fractions of different mobility were determined for both the samples dried with and without sorbitol. Furthermore, the influence of process conditions on both survival and relaxation parameters was studied as it is known that the protective effect of sorbitol depends on process conditions. 

Nordmeier, K. and Menges, G. (1986) The influence of processing conditions on the optical and mechanical properties of extruded and biaxiaUy stretched PP films. Adv. Polymer Technol., 6, 59-64. 

Mendoza et al. (2003) studied experimentally the influence of processing conditions on the spatial distribution of the molecular orientation in injection molded isotactic polypropylene (iPP) plates. They found that the anisotropy of injection molded semi-crystalline polymers is governed by the orientation of the crystalline phase, and the distribution of the orientation strongly depends on the shear rate. Doufas et al. (2000), followed by Zheng and Kennedy (2001), have applied a rigid dumbbell model to simulate crystalline orientation in injection molded semicrystalline polymers. The model reads, in the form used by Zheng and Kennedy (2001, 2004) ... 

Mechanical and processing properties of blends of poly(viityl chloride) (PVC) with di-isodecyl phthalate (DIDP) and thermoplastic polyurethane (TPU) were compared with di-2-ethylhexyl phthalate (DOP). The influence of processing conditions on the mechanical properties was studied by changing the content of the additives and using different twin screw speeds. The mechanical properties (tensile strength, modulus, and energy) of PVC/DIDP presented the same behavior as PVC/DOP at all... 

J. P. Nunes, J. F. Silva, M. J. Oliveira, A. T. Marques (2002) The influence of processing conditions in the production of glass reinforced thermoplastic matrix towpregs, Proc. European Conf Composite Materials ECCM-10, Belgium. 

Nanoparticles are able to provide PP with stiffening, reinforcing and toughening effects at rather low filler concentration. The influence of processing conditions on the nanocomposite structure, i.e. intercalated or exfoliated, and on the enhancement of mechanical properties of PP nanocomposites was studied by different researchers." " Most polymer/clay nanocomposites studies report... 

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