chemistry_project

A development of low density A development of low density polyethylene composites made polyethylene composites made

with rice huskwith rice husk

Chapter1

1.1 Introduction

• At present, plastic is widely used in our modern daily lives for comfort and convenience.

1.2 Objective1.2.1 To obtain the information of

the new composite plastic’s properties with different ratio between polyethylene and rice husk.

1.2.2 To obtain the best combination ratio between polyethylene and rice husk which yields the highest quality of the new composite plastic and greatest minimizing of plastic usage.

1.3 boundary of studying

1.3.1 Produce the composite plastic with the combination of rice husk of 10%, 20%, 30%, and 40% of low density polyethylene mass and test for its properties.

1.4 Expected result

1.4.1 Obtain the best ration of combination, yielding the best quality and greatest minimization of plastic usage.

1.4.2 Obtain a high quality composite plastic from low density polyethylene and rice husk which can replace the original plastic.

1.4.3 Reduce the usage of polyethylene at present.

Chapter2

2.1 Low density polyethylene

Low-density polyethylene (LDPE) is a thermoplastic made from oil. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerisation. Its manufacture employs the same method today.

2.1.1Properties

•LDPE is unreactive at room temperatures.•It can withstand temperatures of 80 °C continuously and 95 °C for a short time. •Made in translucent or opaque variations, it is quite flexible, and tough to the degree of being almost unbreakable.•It has more branching than HDPE, so its intermolecular forces are weaker.•its density is lower than HDPE.

2.1.2 Physical qualities

•Maximum Temperature: 176 °F (80 °C) •Minimum Temperature: −58 °F (−50 °C) •Melting Point: 248 °F (120 °C) •Tensile Strength: 1700 psi (11.7 MPa) •Hardness: SD55 •Excellent flexibility •Density: 0.92 g/cm³

Rice husk is one of the abundant natural resources in Thailand. It has been used as fuel or raw material for silica, but has not been sufficiently utilized so far. Rice husk roughly contains35% cellulose, 35% hemicellulose, 20% lignin and10% ash (94% silica), by dry weight basis

2.2 Rice husk

Chapter3

3.1 Materials

• Low Density Polyethylene (LDPE)

• Rice Husk

3.2 Equipments

• Ball Mills

• Sieve Shaker Machine

• Oven

• Internal Mixer

• Injection Molding

• Tensile Tester

• Impact Tester

3.3 Methods

• 3.2.1 Preparation low density polyethylene composites made with rice husk1. Crush rice husk and screen to 100

mesh size2. Dry the sieved rice husk in an oven at

80 Celcius for 5 hours.3. Compound sifted rice husk and low

density polyethylene by internal mixer

• 3.2.2 Testing

Tensile Tester Impact Tester