Rheological Modification for Asphaltic Materials Using a Mixture (Poly carbonate: Poly Methyl Methacrylate) and Microwave Radiation

Obtaining asphalt that suits the nature of the countries it is used in, is of great importance. Asphalt constitutes an important component in the paving of roads, mastic and flattening substance. This study was included the modification of the asphaltic material by the use of a mixture of polycarbonate and polymethyl methacrylate after crushed to obtain low molecular weight. The study included two paths: In the first asphaltic materials was treated with different percentages of a mixture in the presence of anhydrous aluminium chloride (0.06%of weight) as a catalyst for this reaction. The mixture was heated at 150° for 30 minutes. In the second path, the process of mixing was performed with the existence of a 360 watt microwave radiation for 15 minutes. The process of mixing was repeated in the presence of sulphur (1% of weight) instead of anhydrous aluminium chloride and under the same conditions. Properties of the original and modified asphalts were determined, and this included the measurement of ductility, penetration, softening point, penetration index and calculating the percentage of separated asphaltenes. Additionally, Marshal test, chemical Immersion test and aging were measured for some of the samples. Good samples that can suit Iraq's climate were obtained from this study.

PEMBUATAN DESAIN DAN PURWARUPA ROMPI POLRI LEVEL III A

Kehadiran anggota Polri ditengah-tengah masyarakat khususnya yang berseragam seperti anggota Samapta, Binmas, Pam Obvit, maupun Lalu Lintas tentunya memiliki resiko tersendiri terhadap keselamatan diri anggota yang bertugas tersebut, termasuk juga anggota Polri yang tidak berseragam seperti Reskrim dan Intel. Resiko perorangan berupa luka ringan, luka berat dan meninggal dunia menjadi bukti betapa besarnya resiko personel Polri dalam menjalankan tugasnya. Adanya resiko tersebut tidak dibarengi dengan kelengkapan/ perangkat keselamatan diri anggota yang optimal. Dari latar belakang ini, Puslitbang Polri mencoba merumuskan suatu standar peralatan keamanan dalam hal ini rompi anti peluru dan anti senjata tajam level III A bagi anggota Polri guna meningkatkan efektifitas dan efisiensi tugas operasional Polri. Penelitian ini menggunakan metode kualitatif untuk menemukan spesifikasi teknis sesuai dengan user requirement. Responden penelitian ini adalah anggota Polri fungsi Logistik, Samapta, Lantas , dan Reskrim pada tingkat Polda dan Polres yang berjumlah total 436 responden. Berdasarkan hasil penelitian, akan dibuatkan desain dan purwarupa rompi level III A yang sesuai dengan karakteristik tantangan tugas fungsi kepolisian dengan menggunakan bahan Aramid UD Fabric sebagai material anti peluru dan Poly Carbonate sebagai material anti senjata tajam. Rompi level III A juga akan dilengkapi dengan kompartemen untuk penempatan peralatan pendukung bagi fungsi Samapta dan fungsi Reskrim serta dibuat dalam bentuk pakaian lapis untuk fungsi Reskrim.

Effects of ABS-g-MAH on morphologies, compatibilities and properties of polycarbonate ternary blends

In this work, ABS-g-MAH was used as the compatibilizer in poly carbonate/acrylonitrile styrene acrylate/poly(methyl methacrylate) blends. The polymer blends were prepared via a two-step method: first, raw PC, ASA, PMMA resins and ABS-g-MAH additives were completely mixed and granulated by extrusion molding, and then the standard PC/ASA/PMMA blends samples were obtained by injection molding. A comprehensive characterizations were performed on the PC/ASA/PMMA blends of their morphologies, mechanical properties and thermal properties. The results showed that the addition of ABS-g-MAH could promote the compatibilities among PC, ASA and PMMA, and ABS-g-MAH would significantly alter the mechanical and thermal properties of blends. In addition, the modified PC/ASA/PMMA was well compatible with natural rubber and cause less cytotoxicity when interacting with cells.