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Dr. Abdulaziz Abdullah Alghyamah

Assistant Professor

Chemical Engineering Department

كلية الهندسة
College of Engineering, Building 3, Office # 2 B 42
المنشورات
مقال فى مجلة
2009

Simultaneous Deconvolution of the Molecular Weight and Chemical Composition Distribution of Polyolefins Made with Ziegler-Natta Catalysts

A, Alghyamah, Abdulaziz . 2009

Heterogeneous Ziegler-Natta catalysts produce polyolefins that have broad distributions of molecular weight (MWD) and chemical composition (CCD). For such broad distributions, mathematical models are useful to quantify the information provided by polyolefin analytical techniques such as high-temperature gel permeation chromatography (GPC), temperature rising elution fractionation (TREF), and crystallization analysis fractionation (CRYSTAF). In this paper, we developed a mathematical model to deconvolute the MWD and CCD of polyolefins simultaneously, using Flory's most probable distribution and the cumulative CCD component of Stockmayer's distribution. We have applied this procedure to “model” polyolefin resins and to one industrial linear low-density polyethylene (LLDPE) resin. The proposed methodology is able to deconvolute theoretical distributions even when random noise is added to the MWDs and CCDs, and it can be used to calculate the minimum number of active site types on heterogeneous Ziegler-Natta catalysts.

رقم المجلد
285
رقم الانشاء
1
مجلة/صحيفة
Macromolecular Symposia
الصفحات
81-89
مزيد من المنشورات
publications

Polyolefins made with Ziegler–Natta catalysts have non-uniform distributions of molecular weight (MWD) and chemical composition (CCD). The MWD is usually measured by high-temperature gel…

بواسطة Alghyamah, Abdulaziz A, Soares, Joao B P
2009
publications

Heterogeneous Ziegler-Natta catalysts produce polyolefins that have broad distributions of molecular weight (MWD) and chemical composition (CCD).

بواسطة Alghyamah, Abdulaziz A, Soares, Joao B P
2009
publications

Temperature rising elution fractionation (TREF) and crystallization analysis fractionation (CRYSTAF) fractionate semicrystalline polymers according to their crystallizabilities from dilute…

بواسطة Alghyamah, Abdulaziz A, Soares, Joao B P
2012