Philippine fiber plants, / by William H. Brown.

Abstract

Bureau of Education and are from bulletins dealing with fiber plants used in industrial work in schools. The writer is greatly indebted to Mr. E. D. Merrill of the Bureau of Science for valuable assistance in the preparation of this bulletin. For all of the above assistance the writer desires here to express his grateful appreciation.

Melting behavior of poly(trimethylene terephthalate)

“…1 The products are difficult to commercialize because of the lack of an economical source of trimethylene glycol, also called 1,3-propandiol monomer. Nevertheless, the synthesis of PTT is now available in industrial quantities for use in fiber and engineering thermoplastic applications developed by Shell Chemical Co. [2][3][4][5][6] Because PTT is a relatively new material, little structural information is reported in the literature. Some studies 7,8 have reported that the unit cell of PTT crystal is triclinic and each cell contains two monomers of one polymer chain each, of which methylene bonds are in the gauche conformation (i.e., 3 GT conformation).…”

Kinetics of the polycondensation and copolycondensation of bis(3‐hydroxypropyl) terephthalate and bis(4‐hydroxybutyl) terephthalate

“…The linear aliphatic–aromatic polyesters poly(trimethylene terephthalate) (PTT) and poly(butylene terephthalate) (PBT) are industrially important in commercial fibers, polymeric films, and engineering plastics 1–9. PTT is polymerized from terephthalic acid [or dimethyl terephthalate (DMT)] and 1,3‐propanediol (1,3‐PD) 10.…”

A Monitor Lizard in the Philippines

“…In a similar dipterocarp forest in central Luzon evaporation rate in the upper tree canopy can be over six times as great as in the ground layer. 3 Temperatures in the forested lowland areas inhabited by the monitor are uniform; seasonal averages rarely vary more than 3-4° C and the daily range is often less than 3°C. In similar forested situations in central Luzon, Brown and Matthews (1914) found that mean annual temperature is 23.1°C; maximum 29.7°C, and minimum 19.4°C.…”

“…3 Temperatures in the forested lowland areas inhabited by the monitor are uniform; seasonal averages rarely vary more than 3-4° C and the daily range is often less than 3°C. In similar forested situations in central Luzon, Brown and Matthews (1914) found that mean annual temperature is 23.1°C; maximum 29.7°C, and minimum 19.4°C. Data on thermal stratification within the monitor's habitat were obtained by periodically taking temperatures at three different levels within the dipterocarp forest on the Caramoan Peninsula; in the lower part of the crown on a Parashorea plicata (a dominant, tall tree of the upper story), in the crown on a Dillenia philippinensis (a typical middle-story tree), and in the undergrowth at the surface level.…”